Textile waste stream sorting and recycling

Abstract

Method and apparatus for sorting a textile waste stream to be processed by a solvent-based recycling process, wherein the method comprises the steps of providing textile piece identifiers associated with material composition and / or color of one or more textile waste fractions (210a, 210b, 210c, 210d) of the textile waste stream; generating - based on the provided textile piece identifiers - waste fraction control data configured to sort the one or more textile pieces, and providing the generated waste fraction control data to a sorting system; sorting the one or more textile pieces based on the provided waste fraction control data; separating the sorted textile pieces into one or more chemical components; generating waste fraction data - including a component identifier, and providing the generated waste fraction data for access by one or more decentral network nodes (103.1, 103.2, 103.3, 103.4, 103.5, 103.6) associated with a chemical producer. The sorting apparatus comprises: an identifier reader (906) configured to detect at least one identifier element per waste piece (208) from the textile waste stream, a decentral network communication interface, a fractioning unit configured to fraction the one or more textile pieces based on the material composition data and / or piece history data into one or more textile waste fractions; a control signal generator configured to generate waste fraction control data configured to sort the one or more textile pieces based on the material composition and / or color of the one or more textile pieces, and a control interface (408) configured to provide the generated waste fraction control data to a sorting system (200) configured to sort the textile waste stream.

Description

TEXTILE WASTE STREAM SORTING AND RECYCLINGTECHNICAL FIELDThe disclosure relates to the field of sustainability, in particular to the field of textile waste stream sorting and recycling. The disclosure relates to methods, systems, apparatuses and computer elements for sorting textile waste stream in a data driven manner via a decentral network.TECHNICAL BACKGROUNDTextile industry and related industries encompass production of fibers, yarns, fabrics and finished textile products. Hence, textile industry utilizes a wide range of polymers, both natural and synthetic. During the textile production process, various types of waste are generated such as fiber waste, such as short fibers or trimmings, and fabric waste, which can occur during cutting or manufacturing. Additionally, chemical waste, such as dyestuff or finishing chemicals, can be generated. Moreover, once a textile-based product has reached the end of lifecycle of the product, this would also be rendered as waste and end-up in the textile waste stream. Hence, textile waste stream further includes discarded or unwanted materials generated during the production, consumption, and disposal of textile products. It can arise from various stages within the textile supply chain, including manufacturing, retail, and consumer use.Recycling of textile waste requires separation and a sorting of the textile waste due to the big variety of materials that form textile products such as polymer types, grades, blends and / or additives. Therefore, sorting is a major issue for recycling of textile waste. Recycling has a significant effect on economic aspects of recycling of textile waste and on a sustainability of textile industry in a value chain.SUMMARYIn an aspect, the disclosure relates to a method for sorting a textile waste stream, in particular a mixed textile waste stream, to be processed by a solvent-based recycling process, wherein the textile waste stream includes one or more textile pieces containing textile material(s), the method comprising the steps of: providing textile piece identifier(s) associated with material composition and / or color of one or more textile waste fractions of the textile waste stream; generating - based on the provided textile piece identifier(s) - waste fraction control data configured to sort the one or more textile pieces based on the material composition and / or color of the one or more textile pieces, and providing the generated waste fraction control data to a sorting system configured to sort the textile waste stream; sorting the one or more textile pieces based on the provided waste fraction control data;providing the sorted one or more textile pieces - including sorted textile piece identifier(s) linked to sorted textile piece data associated with material composition and / or color of the sorted textile piece(s) - for separating the sorted one or more textile pieces into one or more chemical components; generating waste fraction data - including a component identifier - associated with chemical composition of the one or more chemical components, and providing the generated waste fraction data for access by one or more decentral network nodes associated with a chemical producer to further process the sorted one or more textile pieces.In another aspect, the disclosure relates to an apparatus for sorting a textile waste stream, in particular a mixed textile waste stream, to be processed by a solvent-based recycling process, wherein the textile waste stream includes one or more textile pieces containing textile material, the apparatus comprising: an identifier reader configured to detect at least one identifier element per piece from the textile waste stream, wherein the at least one identifier element is associated with at least one decentral textile identifier associated with the one or more textile pieces; a decentral network communication interface configured to provide the decentral textile identifier associated with the one or more textile pieces and to provide based on the decentral textile identifier material composition data and / or textile piece history data, wherein the material composition data and / or textile piece history data is provided based on the provided decentral identifier by one or more network nodes of a decentral network; a fractioning unit configured to fraction the one or more textile pieces based on the material composition data and / or piece history data into one or more textile waste fractions; a control signal generator configured to generate - based on the provided decentral textile identifier(s) - waste fraction control data configured to sort the one or more textile pieces based on the material composition and / or color of the one or more textile pieces; a control interface configured to provide the generated waste fraction control data to a sorting system configured to sort the textile waste stream.In yet another aspect, the disclosure relates to a polyester obtained or obtainable by a solvent-based recycling process from a textile waste stream sorted by the method as recited herein, or by apparatus as recited herein.In yet another aspect, the disclosure relates to use of the polyester as recited herein for preparation of textile applications, fiber applications, packaging applications, plastic applications, automotive applications, electronic applications, preferably for the production of food packaging, beverage packaging, clothing, foot wear, wire, cable, wherein preferably in case that the polyester is selected from polybutylenadipat-terephthalat (PBAT), polyethylene furanoate (PEF) and polyethylene terephthalate (PET), preferably PET, the polyester is used for textile applications, fiber applications, packaging applications, plastic applications, more preferably for the production of food packaging, beverage packaging, clothing and foot wear; wherein in case that the polyester is polybutylene terephthalate (PBT),the polyester is used in textile applications, automotive applications, electronic applications, more preferably for the production of a wire and / or a cable.In yet another aspect, the disclosure relates to use of waste fraction control data generated by the method as recited herein, or by the apparatus as recited herein, for sorting one or more textile waste streams, in particular one mixed textile waste stream, to be processed by a solvent-based recycling process.In yet another aspect, the disclosure relates to a decentral data consuming network node or data consuming service configured to provide waste fraction control data, waste fraction data, composition data and / or piece history data by the method as recited herein, or by the apparatus as recited herein, for sorting a textile waste stream, in particular mixed waste stream, to be processed by a solvent-based recycling process.In another aspect, the disclosure relates to a computer program element with instructions, which when executed on a computer is configured to carry out one of the computer-implemented methods for sorting textile waste stream. For example, a computer may be a computing node.In another aspect, the disclosure relates to a computer-readable medium storing data as generated according to one of the computer-implemented methods for textile waste stream.EMBODIMENTSThere is a need to improve production and recycling of textiles.An object of the present disclosure is to provide a method for tracking a recycling property associated with a textile in an industrial process, which allows moving products comprising primary products such as polymers, intermediate products such as fabric and yarn, and end-products such as clothing around a circular economy, and sorting textile waste streams to be processed by a solvent-based recycling process.In the following, embodiments of the present disclosure will be outlined by ways of examples. It is to be understood that the present disclosure is not limited to said embodiments and / or examples.In one embodiment, the method for sorting a textile waste stream, in particular a mixed textile waste stream, wherein the textile waste stream includes one or more piece(s) containing textile material, may comprise the steps of:- retrieving textile piece identifier associated with the material composition and / or color to one or more textile waste fraction(s) and / or, wherein the one or more textile waste fraction(s) relate to one or more waste fraction(s) to be processed by a solvent-based recycling process;generating based on the assigned waste fraction control data for sorting the one or more article(s) to the assigned textile waste fraction(s) and providing the generated control data for sorting the one or more piece(s) to the assigned textile waste fraction(s); generating waste fraction data associated with the total waste fraction's chemical composition.In one embodiment, assigning of one or more textile pieces may include classification according to classification instructions relating material composition data and / or piece history data to one or more waste fractions, wherein the classification instructions are configured to classify the one or more textile pieces based on the material composition data per piece and / or piece history data per piece to the waste fraction to be processed.In another embodiment, assigning of one or more textile pieces may include providing classification instructions that gather decentral identifiers per waste fraction based on the material compositions data per piece and / or piece history data per piece.Additionally or alternatively, the textile waste fraction(s) may specify a fraction composition per waste fraction, a fraction history per waste fraction, a recycling process per waste fraction, a recyclate use per waste fraction or combinations thereof.Moreover, assigning the one or more textile pieces to one or more waste fractions may include providing classification instructions, wherein the classification instructions are provided by one or more decentral network node(s) associated with one or more textile and / or fiber producer(s) using recycled textile waste-based product(s).Furthermore, the material composition data may relate to a chemical composition specifying a textile material contained in the piece, wherein the textile material comprises one or more polymers selected from the group consisting of: Polypropylene (PP), Polyamide (PA), Polyethylene Terephthalate (PET), Acrylonitrile-Butadiene- Styrene (ABS), Polymethylmethacrylate (PMMA), Polyurethane (PU), Thermoplastic Polyurethane (TPU), Polylactic Acid (PLA), and / or Polyvinyl Chloride (PVC).In one embodiment, the piece history data may relate to the use, application and / or origin of the piece.In another embodiment, the waste fraction control data may be provided to a sorting system configured to sort the one or more textile pieces to the assigned waste fraction(s).In yet another embodiment, the material composition data and / or piece history data associated with the one or more waste piece(s) may be gathered and aggregated to fraction data including fraction composition data and / or fraction history data.In one embodiment, a fraction identifier may be provided and fraction data including fraction composition data and / or fraction history data are assigned to the fraction identifier, wherein the fraction identifier includes at least one decentral fraction identifier, wherein the decentral fraction identifier and a representation linked to the fraction data is provided for access by one or more network node(s) of the decentral network.In another embodiment, the waste fraction to be processed may be associated with a recycling process identifier, wherein the recycling process identifier is assigned to the fraction identifier.Additionally or alternatively, the recycling process identifier may include at least one decentral recycling identifier, wherein the fraction composition data and / or fraction history data is provided for access by one or more network node(s) associated with the recycler further processing the waste fraction and / or the chemical producer further processing the waste fraction based on the decentral recycling identifier.In one embodiment, the method may be for controlling a sorting process for a textile waste stream comprising a textile piece in a chemical production network, the method comprising: retrieving a textile piece identifier associated with at least one of a material composition of the textile piece and a color of the textile piece; assigning, based on the textile piece identifier, the textile piece to a waste fraction identifier of a waste fraction; determining, based on the waste fraction identifier, control data for sorting the textile piece to the waste fraction; and providing the control data to the sorting process. The method may be applied in a plurality of applications and / or for a plurality of purposes. For example, in recycling, the method may be used to sort waste stream such as textile waste streams. In production, the method may be used to increase quality of the textile waste stream and, thus, of products produced therefrom. The method may reduce an environmental impact, such as the product carbon footprint (PCF), of the products, such as intermediates products and new textiles. The method may use and / or generate data associated with the textile waste stream, such as analytical data. The data may be used for ensuring at least one of that a particular textile waste stream is suitable for a process, that a particular textile waste stream is suitable for an intended use with regard to quality, a property such as chemical property or mechanical property, and that a particular process is suitable for the textile, for example. The method may allow for digital twinning of the textile(s) and / or industrial process(es).In another embodiment, polyester obtained by waste fraction separation may be used for preparing a product comprising (I) providing a polyester; and (II) preparing a textile, a fiber, a packaging, a plastic, an automotive part, or an electronic part from the polyester provided in step (I).The demand for polymeric materials has drastically increased over the last decades. However, the poor biodegradability has led to large amounts of plastic waste which is worldwide usually incinerated thereby losing valuable materials and generating huge CO2 emissions. Even worse is landfill due to the poor biodegradability. Polymeric materials have been used extensively in the packaging sector, for example, in beverage packaging or foodpackaging. The vast majority of food and drink today is packaged within plastic bottles and containers, made from, for example, polymeric materials comprising polyethylene terephthalate (PET). PET is also a main component of clothing nowadays. As these materials typically have poor biodegradability and are also still valuable products, it is desirable for these plastics to be recovered and recycled. The same applies for polymer blends comprising, for example, polybutylene terephthalate (PBT), which are normally used in the electronic field, for example, as insulating sheath in cable applications.Although recycling processes have been adopted to convert these waste materials into new production materials, there are still many problems associated with recycling and recovery of polymeric materials. Recycling of polyester, especially polyethylene terephthalate (PET), containing textiles is difficult due to mixture with other polymers, for example cotton, and other components, such as colorants etc. Therefore, a closed-loop mechanical recycling process is not possible without separation from other materials. Also, for other PET end-of-life sources, often mechanical recycling is hindered by contaminants and mixed polymer waste streams. The same problems exist for polymer blends with other polyesters, especially polybutylene terephthalate (PBT).The approach of the present disclosure enables a simple separation of polyesters from other materials comprised in a polymer blend, which also enables high recovery rates of the polyester while not harming the relevant properties of the polymeric material such as its number average weight Mn, and which allows for reducing the energetic demand.In one embodiment, the method may comprise sorting the one or more textile pieces based on their composition.In a further embodiment, sorted textile piece(s) may comprise one or more chemical components. Additionally or alternatively, sorted textile piece(s) may comprise a polymer blend. Additionally or alternatively, sorted textile piece(s) may comprise one or more polymer blends.In a further embodiment, further processing may comprise separating sorted one or more textile pieces into one or more chemical components, the one or more sorted textile pieces comprising a polymer, wherein the polymer blend may comprise: (I) a polyester and (II) one or more component(s) selected from the group consisting of a second polymer, a third polymer, a colorant, and an additive, wherein second polymer and third polymer are different from each other and different from the polyester of (I); the solvent-based recycling process comprising:(a) providing the polymer blend and providing a solvent comprising gamma valerolactone (GVL);(b) contacting the polymer blend with the solvent comprising GVL at a temperature T1 of < 170 °C, thereby obtaining a solvent comprising GVL, which is enriched in dissolved optional second polymer, in optional colorant and in optional additive or a part thereof; and a residue of the polymer blend, which is depleted of optional second polymer, of optional colorant and of optional additive or part thereof; and comprises the polyester, optionally the third polymer; and the optional additive or a part thereof; and / or(c) contacting the polymer blend provided in step (a) or the residue of the polymer blend obtained in step (b) with a solvent comprising GVL at a temperature T2 of >170°C, thereby obtaining a solvent, which comprises GVL and which is enriched in dissolved polyester compared to the solvent provided in step (a) and comprises optionally at least a part of the additive, and optionally a residue of the polymer blend, which is depleted of polyester and comprises optionally the third polymer and optionally the additive or a part thereof.Gamma-valerolactone (C5H8O2; IUPAC: 5-methyloxolan-2-one, abbreviation: GVL) is obtainable from carbohydrate- based biomasses, for example, it is readily obtained from sugar, and is thus a "green" solvent. It has now been surprisingly found that using a solvent comprising GVL in the above-described method for separation of a polymer blend comprising polyester resulted in recovery of the polyester in good yields and purities. Furthermore, not only a stop of decrease regarding the mass average molecular weight Mw of the polyester, which is recovered from the polymer blend, could be achieved but also the number average molecular weight Mn increased. Additives, colorants and further polymers, if present, could effectively be removed and also a decrease of intrinsic viscosity could be avoided.Contacting the polymer blend with the solvent comprising GVL is done in step (b) at a temperature T1 of < 170 °C. Preferably, T 1 according to step (b) is in the range of froml 10 to < 170°C, more preferably a temperature in the range of from 110 to 165 °C, more preferably a temperature in the range of from 120 to 160 °C.Contacting the polymer blend provided in step (a) or the residue of the polymer blend obtained in step (b) is done in step (c) with a solvent comprising GVL at a temperature T2 of > 170°C. Preferably, T2 according to step (c) is in the range of from> 170°C to 200 °C, more preferably in the range of from 180 to 195 °C.A "polymer blend” means a combination of at least one polymer - here a polyester (I) - with at least one further component, which is at least another component, selected from the group consisting of a second polymer, a third polymer, a colorant, and an additive, wherein second polymer and third polymer are different from each other and different from the polyester of (I). These components are combined in the polymer blend combined with each other in any suitable way."Contacting” in step (b) and step (c) preferably means that the polymer blend provided in step (a) or the residue of the polymer blend obtained in step (b) respectively is at least partially immersed in the solvent. Preferably, the polymer blend provided in step (a) or the residue of the polymer blend obtained in step (b) respectively is at least partially immersed in the (first or second) solvent in that at least 60 %, more preferably at least 70 %, more preferably at least 80 %, more preferably at least 90 %, more preferably at least 95 %, more preferably at least 99 % of the surface of the polymer blend provided in step (a) or of the surface of the residue of the polymer blend obtained in step (b) respectively are in contact with the solvent, based on the total respective surface being 100%."Depleted in said optional second polymer, of said optional colorant and optionally of additive or part thereof' in step (b) means that at least 50 weight-%, preferably at least 60 weight-%, more preferably at least 70 weight-%, more preferably at least 80 weight-%, more preferably at least 90 weight-%, more preferably at least 95 weight-%, of the respective component(s), based on the total amount of the respective component(s), which was initially comprised in the polymer blend provided in step (a) being 100 weight-%, are no longer comprised by the polymer blend but are rather dissolved in the solvent. Consequently, also "enriched in dissolved optional second polymer, in optional colorant and optionally the additive or a part thereof” regarding the solvent obtained in step (b) means that at least 50 weight-%, preferably at least 60 weight-%, more preferably at least 70 weight-%, more preferably at least 80 weight- %, more preferably at least 90 weight-%, more preferably at least 95 weight-%, of the respective component(s), based on the total amount of the respective component(s), which was initially comprised in the polymer blend provided in step (a) being 100 weight-%, are dissolved in the solvent. The same applies for "depleted of polyester” regarding the residue of the polymer blend obtained in step (c) and also for "enriched in dissolved polyester” regarding the solvent obtained in step (c).The expression "optional additive or a part thereof' in step (b) means that, if one or more additive(s) is / are present in the polymer blend provided in step (a), which is / are soluble in a solvent comprising GVL at a temperature T1, said soluble additive(s) is / are also dissolved in the solvent, which is obtained in (b). In case that not only a soluble additive is present in the polymer blend provided in step (a) but also an additive, which is not soluble in a solvent comprising GVL at a temperature T 1 , said insoluble additive remains in the residue of the polymer blend, which is obtained in step (b). In cases where the polymer blend provided in step (a) comprises only additive(s) soluble in a solvent comprising GVL at a temperature T1 , no additive remains in the residue of the polymer blend. In cases where only additive(s) insoluble in a solvent comprising GVL at a temperature T1 are contained in the polymer blend provided in step (a), all additive(s) remain(s) in the residue of the polymer blend obtained in step (b). In cases where the polymer blend provided in step (a) comprises additive(s) insoluble in a solvent comprising GVL at a temperature T2 and additive(s) soluble in a solvent comprising GVL at a temperature T2, at least a part of the additives, i.e. the soluble additive(s) is / are comprised in the solvent, which is obtained in step (c) and the residue of the polymer blend, which is obtained in step (c) still comprises the insoluble additive(s).Contacting the polymer blend is done in step (b) with the solvent comprising GVL and contacting the polymer blend provided in step (a) or the residue of the polymer blend obtained in step (b) is done in step (c) with a solvent comprising GVL. Preferably, the solvent comprises GVL and optionally one or more solvent(s) selected from the group consisting of water and organic solvents having a log KOW in the range of from -1.6 to +1.6, more preferably selected from the group consisting of water, C5 to C12 alkane, aliphatic C1 to C10 alcohol, C3 to C10 ketone, C2 to C10 cyclic ketone, HO-[C1 to C10 alkyl-O-]n-H, with n being an integer in the range of from 2 to 1000, C1 to C10 alkyl-O-C3 to C10 alkyl ether, C3 to C10 cyclic ether, optionally substituted with one or more C1 to C6 alkyl group(s), C6 to C10 aromatic hydrocarbon, optionally substituted with one or more C1 to C6 alkyl group(s), C2 to C10 aliphatic ester, C8 to C11 aromatic ester, C5 to C10 cyclic carboxylic ester (lactone), C3 to C12 amide, preferably R1R2N-C(=O)-R3, wherein R1, R2 are independently a C1 to C4 alkyl group and R3 is selected from the group consisting of C1 to C9 alkyl group, C1 to C10 ester group and C1 to C6 ether group, C3 to C6 lactame, optionally substituted with one or more substituent selected from C1 to C6 alkyl group, C1 to C6 ester group and C1 to C6 ether group and C5 imidazolidine, optionally substituted with one or more C1 to C6 alkyl group(s), C5 to C7 imidazolidone, optionally substituted with one or more C1 to C6 alkyl group(s), wherein preferably at least 1 weight-%, more preferably at least 5 weight-%, more preferably at least 10 weight-%, more preferably at least 20 weight-%, more preferably at least 30 weight-%, more preferably at least 40 weight-%, more preferably at least 50 weight-%, more preferably at least 60 weight-%, more preferably at least 70 weight-%, more preferably at least 80 weight-%, more preferably at least 90 weight-%, more preferably at least 95 weight-% of the solvent consists of GVL, based on the total weight of the solvent being 100 weight-%.Preferably, in step (b) and in step (c) the same solvent comprising GVL is used.A polymer blend is provided in step (a), wherein the polymer blend comprises (i) a polyester and (ii) one or more component(s) selected from the group consisting of a second polymer, a third polymer, a colorant, and an additive, wherein second polymer and third polymer are different from each other and different from the polyester of (i). The polyester is preferably based on 1 ,4-butanediol or 1 ,2-ethandiol, more preferably the polyester according to (i) is selected from the group consisting of a polymer based on 1 ,4-butanediol and terephthalic acid (polybutylene terephthalate, PBT), a polymer based on 1 ,2-ethanediol and terephthalic acid (polyethylene terephthalate, PET), a copolymer of 1 ,4-butanediol, adipic acid and terephthalic acid (polybutylenadipat-terephthalat, PBAT), a polymer of 1 ,2- ethanediol and 2, 5-furandicarboxy lie acid (polyethylene furanoate, PEF) and mixtures of two or more of these (co)polymers, more preferably, the polyester comprises at least PET or PBT, more preferably the polyester is PET or PBT or a mixture of PET and PBT.The second polymer is preferably selected from the group consisting of polyurethane (PU), polyethylene glycol (PEG), polytetrahydrofuran (pTHF), mixtures of these polymers and copolymers of these polymers. Preferably, the second polymer comprises a, preferably thermoplastic and / or elastomeric polyurethane or polyurea or mixture of both based on polymeric polyol(s) and diisocyanate(s). Further comprised may be aliphatic diol(s) and / or diamine(s). The polymeric polyol (s) may preferably comprise or be polyesterpolyol(s), polyetherpolyol (s) or a mixture of two or more thereof. For example, the polymeric polyol(s) may comprise or be polyethylene glycol (PEG) and / or polytetrahydrofuran (pTHF). pTHF may have, for example, a number average molecular weight in the range of from 1000 to 8000 g / mol, preferably in the range of from 1000 to 3000 g / mol, more preferably in the range of from 1000 to 1800g / mol. The diisocyanate(s) may preferably comprise or be aliphatic diisocyanate(s), aromatic diisocyanate(s) or a mixture of two or more thereof. For example, the diisocyanate(s) may comprise or be 1,T-methylenebis(4- isocyanatobenzene) (MDI). The aliphatic diol(s) may preferably comprise or be ethylene glycol, 1 ,3-propanediol, 1 ,4- butanediol or a mixture of two or more thereof. The diamine(s) may preferably comprise or be aliphatic diamine(s), cycloaliphatic diamine(s) or a mixture of two or more thereof. For example, the diamine(s) may comprise or be 1,2-ethylene diamine. More preferably, the second polymer has > 85 weight-% polyurethane, polyurea or mixture of both based on the total weight on the second polymer being 100 weight-% (Spandex). Spandex preferably has an elongation at break in the range of from 250 to 700%, preferably 300 to 700%, more preferably 400 to 700 %, determined based on DIN 53835-2:2024-05. Spandex is presumably not only dissolved in step (b), but furthermore at least partially degraded - this is apparent from, for example, Differential Scanning Calorimetry (DSC) measurements. The third polymer is preferably selected from the group consisting of polyolefins, preferably polyethylene (PE) and polypropylene (PP), polyamide (PA), natural polymer, preferably wool, cotton or viscose, mixtures of two or more of these polymers and copolymers of two or more of these polymers, wherein the third polymer is preferably selected from PA, wool, cotton, viscose and mixtures of two or more of these polymers. PA comprises preferably PA6 and PA66; however, in some embodiments PA6 is excluded as third polymer and preferably, the polymer blend provided in step (a) does not comprise PA6. If present in the polymer blend, the solvent obtained in step (c), which is enriched in dissolved polyester is separated from the residue, which comprises at least one of PP, PE, PA and / or natural polymer. All polymers not soluble together with the polyester, preferably all polymers not soluble together with the polyester in a solvent comprising GVL under the conditions of step (c) as defined above, are called herein "insoluble polymers”.The colorant is preferably selected from the group consisting of dye and optical brightener and mixtures of dye and optical brightener. A "colorant” is a substance that cause the change of color impression of a material. This comprises dyes, which absorb wavelength intervals of visible light (400 to 780 nm) and optical brighteners, which amplify the light emission of a material through UV light adsorption and emittance of visible light (through fluorescence), i.e. an optical brightener converts radiation that is not visible to the human eye (< 400nm) into visible fluorescence radiation of the blue-red spectral range (400 to 600 nm). Colorants usable or used for changing the color impression of polymeric materials are known to the skilled person. In the context of the present disclosure, the term "dye” means any kind of dye such as dye, pigment, dispersion, wherein a dye is, for example, one or more selected from the group consisting of acid dye, basic dye, direct dye, disperse dye, azoic dye, food dye, solvent dye, organic dye, inorganic pigment, organic pigment, disperse ink, reactive ink, oxidation dye, reactive dye, sulfur dye, mordant dye and vat dye. The term "optical brightener” comprises optical brightening agents, fluorescent brightening agents, and fluorescent whitening agents.Overviews of colorants for polymeric materials can be found, for example, in "Dyes and Pigments” Metin Agiky ildiz, Kubra Giines, Ahmet Giirses Springer, 2016 (ISBN: 10 : 3319338900); Industrial Organic Pigments - Klaus Hunger, Thomas Heber, Martin U. Schmidt, Friedrich Reisinger, Stefan Wanne Wiley-VCH, 4th edition, 2018 (ISBN: 978-3- 527-32608-2); Chemistry and Technology of Natural and Synthetic Dyes and Pigments - Ashis Kumar Samanta, Nasser Awwad, IntechOpen, 2020 (ISBN: 9781789859980, 9781789859973, 9781839687587); Encyclopedia of Color, Dyes, Pigments - Volume 1, Gerhard Pfaff, de Gruyter, 2021 (ISBN: 311058588X); Heinrich Zollinger: Color Chemistry: Syntheses, Properties, and Applications of Organic Dyes and Pigments. 3rd edition. WILEY-VCH Verlag, Weinheim 2003 (ISBN: 3-906390-23-3); Klaus Hunger (Ed.): Industrial Dyes: Chemistry, Properties, Applications.WILEY-VCH Verlag, Weinheim 2003 (ISBN: 3-662-01950-7); Hermann Rath: Lehrbuch der Textilchemie. einschl. der textilchemischen Technologie. 2nd edition. Springer-Verlag, Berlin, Heidelberg 1963 (ISBN: 978-3-662-00065-6); Wilfried Kratzert, Rasmus Peichert: Farbstoffe. Quelle & Meyer, Heidelberg 1981 (ISBN: 3-494-01021-8); Ullmann's Encyclopedia of industrial chemistry, Wiley-VCH, 2000, sections "dyes and pigments” and "dyes, general survey” (ISBN: 9783527303854).Preferably, colorants in the context of the present disclosure are colorants, which are not covalently bound to the polyester and / or the third polymer if present.In one embodiment, depleted in colorant regarding the residue of the polymer blend obtained in step (b) means that the L*a*b* values of the residue, which is depleted in colorant compared to the polymer blend provided in step (a), change in that: the absolute value of a* changes, preferably by at least 0.2; and / or, preferably and, the absolute value of b* changes, preferably by at least 0.2; and / or, preferably and, the L* value increases, preferably by at least 4, each compared to the L*a*b* values of the polymer blend provided in step (a), wherein L*a*b* values are determined according to DIN 5033 and DIN EN ISO 11664-1.6.In another embodiment, a residue of the polymer blend in step (b) with L*a*b* values of the residue which are changed compared to the polymer blend provided in step (a) may be achieved in that: the absolute value of a* changes, preferably by at least 0.2, more preferably by at least 0.3, more preferably by at least 0.4, more preferably by at least 0.5, more preferably by at least 0.6, more preferably by at least 0.7, more preferably by at least 0.8, more preferably by at least 0.9, more preferably by at least 1.0, more preferably by at least 1.1, more preferably by at least 1.2, more preferably by at least 1.3, more preferably by at least 1.4, more preferably by at least 1.5, more preferably by at least 1.6; and / or, preferably and, the absolute value of b* changes, preferably by at least 0.2, more preferably by at least 1, more preferably by at least 2, more preferably by at least 3, more preferably by at least 4, more preferably by at least 5, more preferably by at least 6, more preferably by at least 7, more preferably by at least 8, more preferably by at least 9; and / or, preferably and, the L* value increases, preferably by at least 4, more preferably by at least 5, more preferably by at least 10, more preferably by at least 15, more preferably by at least 20, more preferably by at least 25, more preferably by at least 30, more preferably by at least 35, more preferably by at least 40, each compared to the L*a*b* values of the polymer blend provided in step (a), wherein L*a*b* values are determined according to DIN 5033 and DIN EN ISO 11664-1.6.These L*a*b* value changes may especially apply for dark colored starting material having an L*of < 80, preferably of < 50.The expression "irrespective of the color” means that, even if analytics are normally done for materials of each color separately, the definitions given above apply for single-colored polymeric materials, but also for polymeric materials having a plurality of colors and mixtures of pieces of polymeric materials, wherein each piece has its own color or its own color mix.The condition of being "depleted in colorant”, which is expressed above based on quantitative L*a*b* values is also identifiable visually by the eye: The polymer blend provided in step (a), if not being white, i.e. colorless, has a certain color, wherein the residue obtained is lighter and whiter respectively. This applies especially for all colorants not being optical brighteners. Depleted in colorant regarding the residue obtained means, especially with respect to optical brighteners being the colorant, that the intensity of emitted fluorescence radiation (emission), preferably in the range of from 400 to 600 nm, is reduced for the residue obtained when irradiated with light with a wavelength in the range of from 250 to 400 nm compared to the intensity of emitted fluorescence radiation (emission), preferably in the range of from 400-600 nm, of the polymer blend provided in step (a).Methods for determination of the intensity of emitted fluorescence radiation are known to the skilled person, for example, the determination can be made visually by using an UV lamp, by fluorescence determination or determination of quantum yield.The additive is preferably selected from the group consisting of softener, water repellent, flame retardant, UV filter, plasticizer, filler and mixtures of two or more thereof. A softener is preferably selected from the group consisting of silicone based softener, fatty alcohol, fatty acid, fatty amino acid, fatty acid derivate, fatty amino acid derivate, polyethylene, alkyl imidazolinium salt, bisquaternary ammonium salt and mixtures of two or more thereof, wherein "fatty” refers to an alkyl chain having in the range of from 8 to 22 C atoms; more preferably selected from the group consisting of polydiorganosiloxane (preferably polydimethylsiloxane and / or derivative of polydimethylsiloxane), fatty alcohol, condensation product of fatty amino acid with ethylene oxide, ethoxylated fatty acid, ethoxylated fatty alcohol, paraffin, oxidized polyethylene wax, optionally in combination with quaternary ammonium compounds, wherein the quaternary ammonium compound is preferably selected from the group of N+R1R2R3R4, wherein R1 and R2 are independently selected from C1 to C3 alkyl and , optionally substituted with a hydroxyl group, and R3 and R4 are independently selected from C8 to C22 alkyl and C2 to C4 alkyl-C(=O)-O- C8 to C22 alkyl; wherein the ammonium compound is more preferably selected from dimethyl (dihydrogenated tallow) ammonium, dimethyl distearyl ammonium and mixtures of these two, wherein the positive charge of the quaternary ammonium compound is preferably compensated by one or more anions, preferably selected from chloride, methyl sulfate and mixture of these two anions. A water repellent is preferably selected from the group consisting of siloxane (preferably unsaturated (e.g. vinyl-terminated) polydialkylsiloxane, hexamethyldisiloxane or a mixture of two or more thereof),silane (preferably hexatrimethoxysilane), paraffin (preferably in dispersion with aluminum salts, more referably stearic acid with aluminum or zirconium salts), fat modified melamine (preferably stearic acid-melamine derivate), silicone, tin octoate, fluorocarbon (preferably selected from perfluorohexanoic acid (PFHA), perfluorooctanoic acid (PFOA), per-fluorooctane sulfonate (PFOS), and mixtures of two or more thereof), acrylic polymers containing perfluoroalkyl chains, alkylphenol ethoxylate (APEO), and mixtures of two or more thereof. Regarding the acrylic polymers containing perfluoroalkyl chains, the length of the perfluorinated alkyl side chains is in the range of from 8 to 10 carbon atoms. The small spacer group, mostly ethylene, can be modified to improve emulsification and solubility of the polymer. Comonomers such as stearyl- or laurylmethacrylate, butylacrylate, methylol- or epoxy-functional acrylates and block copolymers from a, co dihydroxydimethylpolysiloxane. A flame retardant is preferably selected from the group consisting of halogenated flame retardant (preferably hexabromocyclododecane, decabromodiphenyl ether, bis(hexachlorocyclopentadieno)cyclo-octane, trisdibromopropylphosphate, decabromodiphenyl oxide (DBDPO) and mixtures of two or more thereof), non-halogenated flame retardant, phosphor-containing flame retardant, phosphor-free flame retardant (preferably selected from the group consisting of tetraethoxysilane (TECS), (3-aminopropyl) triethoxysilane (APTES), 3-glycidy loxypropyl trimethoxysilane (GPTMS) and mixtures of two or more thereof), compound without halogenates and phormol, compound with halogenates or phormol, metal hydroxide, and mixtures of two or more thereof; more preferably from the group consisting of oligomeric reaction products with urea of hydroxymethyl phosphonium chloride, aluminiumhydroxid, calcium carbonate, and mixtures of two or more thereof. A UV filter is preferably selected from the group of hydroxyphenone derivative (preferably from the group of hydroxyphenyl triazines), benzotriazole (preferably 2-(2H-benzotriazol-2-yl)-4,6-bis(1 -methyl-1 -phenylethyl)), oxanilide, hydroxyphenyl benzotriazole, derivative of Hindered Amine Light UV stabilizers (HALS derivatives), benzothiazinone, salicyclic acid ester, cinnamic acid ester, resorcinol monobenzoate, hydroxybenzoic acid ester, cyanoacrylate, benzophenone, and mixtures of two or more thereof. A plastiziser is preferably selected from the group consisting of phthalic acid ester, adipic acid ester, terephthalic acid diester, trialkyl trimellitate, 1,2- cyclohexandicarboxylic diester, 1 ,3-cyclohexandicarboxylic diester, 1,4-cyclohexandicarboxylic diester, and mixtures of two or more thereof.Further additives are adhesive, thickener, antifoam agent, finishing agent (for example water / oil / stain repellent, flame retardant, anticrease agent, biocide), binder, surfactant (for example, softener, scouring agent, antistatic agent), desizing agent, bleaching agent, oxidant, UV filter, emulsionant, fixing agent, washing dispersant, profiling agent.A "filler” is, for example, glass fiber, coal fiber, carbon black, inorganic salt (for example, talc, disodium carbonate). These components are known to the skilled person. Filler(s), if present, form part of the residue of the polymer blend, which is depleted of polyester and comprises optionally the third polymer and optionally the additive or a part thereof, obtained in step c).As indicated above, contacting of the polymer blend is done in step (b) with the solvent comprising GVL and contacting of the polymer blend provided in step (a) or the residue of the polymer blend obtained in step (b) is donein step (c) with a solvent comprising GVL. Preferably, step (b) and / or step (c) are done in a gaseous atmosphere comprising at least one inert gas, more preferably in a gaseous atmosphere comprising nitrogen. Preferably, step (b) and / or step (c) are done at a pressure in the range of from 800 to 1200 hPa, preferably in the range of from 900 to 1100 hPa, more preferably in the range of from 1000 to 1100 hPa or at a pressure in the range of from 1013 to 200,000 hPa, preferably in the range of from 1013 to 100,000 hPa.In one embodiment for separating a polymer blend, at least one of step (b) and step (c), preferably step (b) and / or step (c), is / are conducted in continuous manner or discontinuous manner. According to this embodiment, step (b) and / or step (c) is either carried out under a flow of the solvent comprising GVL (continuous manner) or in a stationary mode (discontinuous manner, batch mode). The contacting is done in one or more vessel(s), for example, one or more vessels are filled with colored polymer blend material and the solvent comprising GVL is directed through this vessel / these vessels with a specific flow. A preferred example is a, preferably stirred, vessel cascade. In one embodiment for separating a polymer blend, at least one of step (b) and step (c), preferably step (b) and / or step (c), is / are in counter current mode. According to this embodiment, step (b) and / or step (c) is carried out in counter current mode. For example, if the contacting of step (b) is done within a vessel, the solvent comprising GVL enters the vessel from one direction (either side or top / bottom) and the polymer blend enters the vessel from an another, preferably an opposite, direction. In a preferred arrangement wherein a vertically arranged vessel is used, the solvent comprising GVL enters the vessel from the bottom and the polymer blend enters the vessel from the top.Irrespective whether step (b) and step (c), preferably step (b) and / or step (c), is / are conducted in continuous manner or discontinuous manner and irrespective whether co current mode or counter current mode are applied, it is preferred that the solvent is preheated to the respective temperature (T1, T2) and then contacted with the polymer blend or the respective residue.In one embodiment for separating a polymer blend, at least one of step (b) and step (c), preferably both step (b) and step (c), is / are conducted under mechanical intermixing, wherein mechanical intermixing preferably comprises one or more methods selected from stirring, blending, and ultrasound.As indicated above, contacting of the polymer blend is done in step (b) with the solvent comprising GVL and contacting of the polymer blend provided in step (a) or the residue of the polymer blend obtained in step (b) is done in step (c) with a solvent comprising GVL. Preferably, the mass-based ratio polymer blend: solvent in step (b) and / or in step (c) is in the range of 1 :1 to 1 :100, preferably in the range of from 1 :1 to 1 :20.Preferably, step (b) comprises:(b.1) contacting the polymer blend with the solvent comprising GVL at a temperature T1 of < 170 °C, thereby obtaining a solvent comprising GVL, which is enriched in dissolved optional second polymer, in optional colorant and optionally the additive or a part thereof; and a residue of the polymer blend, which is depleted of said optional secondpolymer, of said optional colorant and optionally of additive or part thereof; and comprises the polyester, optionally the third polymer; and the optional additive or a part thereof;(b.2) separating the solvent, which is enriched in dissolved optional second polymer, in optional colorant and optionally the additive or a part thereof, and the residue of the polymer blend, which is depleted of said optional second polymer, of said optional colorant and optionally of additive or part thereof; and comprises the polyester, optionally the third polymer; and the optional additive or a part thereof obtained in step (b.1 ), preferably by a physical separation method, thereby obtaining a separated solvent, which is enriched in dissolved optional second polymer, in optional colorant and optionally the additive or a part thereof compared to the solvent provided in step (a) and the residue of the polymer blend, which is depleted of said optional second polymer, of said optional colorant and optionally of additive or part thereof; and comprises the polyester, optionally the third polymer; and the optional additive or a part thereof.Physical separation methods may comprise mechanical separation methods, thermal separation methods and mixed forms of mechanical and thermal separation.The separation in step (b.2) is done by methods and means known to the skilled person, especially solid-liquid separation methods such as filtration, for example, heated pressure filtration, sedimentation or centrifugation (see Handbuch der mechanischen Fest-Fliissig-Trennung Taschenbuch - 29. April 2004 von Klaus Luckert (Herausgeber)). Colorants and / or second polymer, if present in the polymer blend, especially in the polyester, remain at least partially in the separated solvent obtained in step (b.2). In some preferred embodiments of the process, step (b.2) is done at a pressure in the range of from 800 to 200,000 hPa.Preferably, step (b) further comprises:(b.3) washing the separated residue of the polymer blend obtained in step (b.2) at least once with a washing solvent comprising GVL and optionally one or more solvent(s) selected from the group indicated above, thereby obtaining a washed residue;(b.4) optionally drying the washed residue obtained in step (b.3).Step (b.3) and optional step (b.4) are conducted preferably if the polymer blend provided in step (a) comprises a colorant and / or a second polymer, in order to reduce the amount of colorant and / or a second polymer carried along by the residue obtained in step (b.2). In some preferred embodiments of the process, step (b.3), step (b.4) is / are done at a pressure in the range of from 800 to 200,000 hPa.When polymer blend comprises at least a third polymer, the method preferably comprises d) separation of the solvent system, which is enriched in dissolved polyester obtained in step (c) from the residue obtained in step (c), thereby obtaining a solvent enriched in dissolved polyester, which is free of third polymer, and aresidue comprising at least the third polymer, wherein the separation is done by heated solid-liquid separation, preferably at a temperature in the range of T2 ± 20°C, more preferably at a temperature in the range of T2 ± 10°C.Heated solid-liquid separation is, for example, heated filtration, wherein the solution, filter, and funnel are heated, preferably heated so that each has temperature T2 ± 20°C or T2 ± 10°C. In some embodiments, it is preferred that the heated filtration is done under a pressure of >1 bar, more preferably at a pressure in the range of from 1 bar to 30 bar, preferably in the range of from 1 to 10 bar, more preferably in the range of from 1 to 6 bar (heated pressure filtration). Other means and methods for the separation are known to the skilled person such as non-heated filtration. Further methods and means for solid-liquid separation are known to the skilled person, especially sedimentation or centrifugation (see Handbuch der mechanischen Fest-Flussig-Trennung Taschenbuch - 29. April 2004 von Klaus Luckert (Herausgeber) In some preferred embodiments with heated filtration, the filter and the residue comprising at least the third polymer (which is retained on the filter), preferably after the solvent system, which is enriched in dissolved polyester, has passed through the filter, is rinsed with solvent for one or more times, preferably with a solvent having the same composition as used in step (c).The method preferably further comprises(e) optionally after heated solid-liquid separation according to step (d), cooling the solvent obtained in step (c) or in step (d), which is enriched in dissolved polyester compared to the solvent provided in step (a), to a temperature below T2 preferably below 150°C, more preferably below 140°C, more preferably below 120°C; thereby obtaining a precipitated polyester and a solvent, which is depleted in dissolved polyester.The temperature to which the cooling is done is a temperature below T2°C, preferably below 150°C, more preferably below 140°C, more preferably below 120°C and, in each case, above 0 °C, preferably above 5 °C, more preferably above 10 °C. The optional solid-liquid separation according to step (d) and the precipitation according to step (e) are preferably done at a pressure in the range of from 800 to 1200 hPa, preferably in the range of from 900 to 1100 hPa, more preferably in the range of from 1000 to 1100 hPa. Cooling in step (e) is preferably done without addition of antisolvents. In some embodiments, only a small amount of one or more antisolvent(s) is / are added to and / or is / are present in the solvent in step (c), wherein a small amount means that less than 5 weight- %, preferably less than 4 weight-%, more preferably less than 3 weight-%, more preferably less than 2 weight-%, more preferably less than 1 weight-% of antisolvent(s) is / are added and / or is / are present based on the total weight of the solvent including the antisolvent(s) being 100 weight-%. Cooling is done by any suitable method, for example, by letting the solvent obtained in step (e) stand under ambient conditions (1013 hPa and room temperature 20-25 °C), preferably with a cooling rate in the range of from 20 to 80 K / h, or by applying cooling means such as slow cooling, preferably in a crystallizer, preferably with a cooling rate in the range of from 3 to 25 K / h, in some preferred embodiments with a cooling rate in the range of from 3 to 60 K / h, fast cooling, preferably with a cooling rate > 100 K / h, dripping into a solvent, which has a temperature below 30 °C, wherein the solvent for dripping is the same or different as the solvent(s) of the solvent provided in step (a) but is in any case also a solvent selected from the group indicatedabove. In some embodiments, cooling is done with a cooling rate of < 3.0 °C / min, preferably < 1 .5 °C / min, more preferably in the range of from 0.05 to 3.0 °C / min, more preferably in the range of from 0.13 to 3.0 °C / min, more preferably in the range of from 0.15 to 1.5 °C / min, more preferably in the range of from 0.15 to 1.0 °C / min.An "antisolvent” is a solvent having a solubility regarding the polyester < 1g / kg at a temperature in the range of from 20 to 25 °C.In some embodiments, the method comprises after (d), if a residue is present, and before step (e) (x.1) optionally contacting the residue comprising at least the third polymer of step (d) with solvent system, preferably at a temperature T2 ± 20°C, more preferably at a temperature in the range of T2 ± 10°C, as defined above in (d), followed by solid-liquid separation, preferably heated solid-liquid separation at a temperature T2 ± 20°C, more preferably at a temperature in the range of T2 ± 10°C, as defined above in (d), thereby obtaining a residue comprising at least the third polymer, which is further depleted of polyester and comprises the third polymer; and a solvent system, which contains further amount of the polyester;(x.2) optionally combining the solvent system, which contains the further amount of the polyester obtained in (x.1) with the solvent system, which is enriched in dissolved polyester, separated in (d).Preferably, the contacting in (x.1) is done in that, especially in cases where heated solid-liquid separation is used in (d), the residue of the polymer blend obtained in (d) remains on the filter and is there brought into contact with solvent system, wherein the solvent system, which contains the remaining amount of the polyester obtained in (x.1), is separated thereof due to solid-liquid separation.The solvent system used in (x.1) comprises GVL and optionally one or more solvent(s) selected from the group indicated above for the contacting in step (c). Preferably, the solvent system used in (x.1) is the same solvent system as the solvent system used in step (c). More preferably, in step (b) and in step (c) and in optional step (x.1), the same solvent comprising GVL is used.If step (x.1) and step (x.2) are conducted, cooling the solvent system in step (e) is preferably done based on the separated solvent system obtained in (d) or based on the combined solvent system obtained in (x.2).The method preferably further comprises(f) separating the precipitated polyester obtained in step (e) from the solvent, which is depleted in dissolved polyester, thereby obtaining a precipitated polyester and the solvent, which is depleted in dissolved polyester.The method preferably further comprises(g) optionally washing the precipitated polyester obtained in step (f);(h) drying the precipitated polyester obtained in step (f) or the washed precipitated polyester obtained in step (g).The separation in step (f) is done by methods and means known to the skilled person, especially solid-liquid separation methods such as filtration, for example, heated pressure filtration, sedimentation or centrifugation (see Handbuch der mechanischen Fest-Flussig-Trennung Taschenbuch - 29. April 2004 von Klaus Luckert (Herausgeber)).Washing in optional step (g) is preferably done with a solvent comprising one or more of the solvent(s) of the group defined above. In some embodiments, washing is done with a solvent selected from the group consisting of methanol, ethanol, propanol, isopropanol, acetonitrile, ethyl acetate, acetone, water or a mixture of two or more of these solvents. In some embodiments, the washing in optional step (g) is done with a solvent selected from the group consisting of methanol, ethanol, propanol, isopropanol, acetonitrile, ethyl acetate, acetone, water, GVL or a mixture of two or more of these solvents. Drying in step (h) is preferably done under one or more conditions selected from the group consisting of a pressure in the range of from 1 to 1013 mbar; a temperature in the range of from 50 to 210 °C, preferably in the range of from 60 to 180°C, more preferably in the range of from 80 to 160 °C; drying time in the range of from 30 minutes to 24 hours; drying in an atmosphere comprising nitrogen, preferably in an atmosphere having at least 90 volume-%, more preferably 95 volume-%, more preferably at least 98 volume-% nitrogen. Drying is done by one or more methods selected from the group consisting of contact drying, convection drying and radiation drying.In some preferred embodiments of the process, step (f), step (g) and step (h) are done at a pressure in the range of from 800 to 200,000 hPa.Preferably, the method comprises recycling solvent re-obtained from one or more step(s), preferably the separated solvent obtained in step (b.2), the washing solvent from step (b.3), the separated solvent of step (d), the separated solvent of step (f), and / or the washing solvent of step (g) at least partially to step (b) and / or step (c), optionally after one or more work-up step(s) such as distillation.The method preferably further comprisesI) preparing a textile, a fiber, a packaging, a plastic, an automotive part, an electronic part from the polyester obtained from the method as described herein above, preferably part from the polyester obtained from step (b), step (b.2), step (b.3), step (b.4), step (c), step (d), step (e), step (f), step (g) and / or from step (h) as described herein above.In one embodiment, a polyester may be obtained or obtainable from the method as recited herein, preferably from step (b), step (b.2), step (b.3), step (b.4), step (c), step (d), step (e), step (f), step (g) and / or from step (h) as recitedherein. A polyester may be prepared according to the method as described herein above, preferably from step (b), step (b.2), step (b.3), step (b.4), step (c), step (d), step (e), step (f), step (g) and / or from step (h).In another embodiment, the disclosure also relates to using the polyester as described herein for preparation of textile applications, fiber applications, packaging applications, plastic applications, automotive applications, electronic applications, preferably for the production of food packaging, beverage packaging, clothing, foot wear, wire, cable, wherein preferably in case that the polyester is selected from PBAT, PEF and PET, preferably PET, the polyester is used for textile applications, fiber applications, packaging applications, plastic applications, more preferably for the production of food packaging, beverage packaging, clothing and foot wear; wherein in case that the polyester is PBT, the polyester is used in textile applications, automotive applications, electronic applications, more preferably for the production of a wire and / or a cable.In a further embodiment, the method may also comprise preparing a product comprising(I) providing a polyester as recited herein;(II) preparing a textile, a fiber, a packaging, a plastic, an automotive part, an electronic part from the polyester provided in step (I).In a further embodiment, the method may comprise a step of converting the polyester obtained or obtainable from the method as described herein, preferably from step (b), step (b.2), step (b.3), step (b.4), step (c), step (d), step (e), step (f), step (g) and / or from step (h) as described above or the second polymer obtained or obtainable from the method as described herein, or a third polymer obtained or obtainable from the method as described herein, or a chemical material obtainable by or obtained by the method as described herein, to obtain a product PRF1.In a still further embodiment, the disclosure relates to a product PRF1, obtained or obtainable from the method of the above-described.Preferably, the product PRF1 is selected from:I) building block or monomer; orII) polymer, preferably polymer A, polymer composition, preferably polymer composition A, or polymer product, preferably polymer product A; or ill) industrial use polymer, industrial use surfactant, descaling compound, industrial use biocide, industrial use solvent, industrial use dispersant, composition thereof or formulation thereof; or iv) agrochemical composition, agrochemical formulation auxiliary or agrochemically active ingredient; or v) active pharmaceutical ingredient or intermediate thereof, pharmaceutical excipient, animal feed additive, human food additive, dietary supplements, aroma chemical or aroma composition; or vi) aqueous polymer dispersion, preferably polyurethane or polyurethane - poly(meth)acrylate hybrid polymer dispersion, emulsion, binder for paper and fiber coatings, UV-curable acrylic polymer for hot melts andcoatings polyisocyanates, hyperbranched polyester polyol, polymeric dispersant for inorganic binder compositions, unsaturated polyester polyol or 100% curable composition; or vii) cosmetic surfactant, emollient, wax, cosmetic polymer, UV filter, further cosmetic ingredient or composition or formulation thereof; or viii) polymer B, polymer composition B, coating composition, other functional composition, foil, molded body, coating or coated substrate.Regarding this process from which the product PRF1 is obtained, it is preferred: that the content of the polyester obtained or obtainable from the method as recited herein, or of the second polymer obtained or obtainable from the method as recited herein, or of the third polymer obtained or obtainable from the method as recited herein, or a chemical material obtainable by or obtained by the method as recited herein, in the product PRF1 is 1 weight-% or more, preferably 2 weight-% or more, more preferably 5 weight-% or more, more preferably 15 weight-% or more, more preferably 30 weight-% or more, more preferably 40 weight-% or more, more preferably 60 weight-% or more, more preferably 80 weight-% or more, more preferably 90 weight-% or more, more preferably 95 weight-% or more; and / or wherein the content of the polyester obtained or obtainable from the method as recited herein, or of the second polymer obtained or obtainable from the method as recited herein, or of the third polymer obtained or obtainable from the method as recited herein, or a chemical material obtainable by or obtained by the method as recited herein, in the product PRF1 is 100 weight-% or less, preferably 95 weight-% or less, more preferably 90 weight-% or less, more preferably 50 weight-% or less, more preferably 25 weight-% or less, more preferably 10 weight-% or less; and preferably wherein the content is determined based on identity preservation and / or segregation and / or mass balance and / or book and claim chain of custody models, preferably based on mass balance, preferably the International Sustainability and Carbon Certification (ISCC) standard.The publication Prior Art Disclosure; Issue 684; paragraphs

[1000] to

[8005] ; ISSN: 2198-4786; published: February 12, 2024 will be regarded as Reference RF1, which is incorporated herein by reference in its entirety. Preferably, the product PRF1 is a product as described in Reference RF1; paragraphs

[1000] to

[8005] , Preferably, the method described herein is further a method for the production of a product, preferably product PRF1 .The converting step to obtain the product PRF1 preferably comprises one or more step(s) as described below and can be performed by conventional methods well known to a person skilled in the art. The converting step preferably comprises one or more step(s) selected from: recycling, preferably depolymerizing, gasifying, pyrolyzing, and / or steam cracking; and / or purifying, preferably crystallizing, (solvent) extracting, distilling, evaporating, hydrotreating, absorbing, adsorbing and / or subjecting to ion exchanger; and / or assembling, preferably foaming, synthesizing, chemical conversion, chemically transforming, polymerizing and / or compounding; and / orforming, preferably foaming, extruding and / or molding; and / or finishing, preferably coating and / or smoothing.In addition, the one or more step(s) are described in detail in Reference RF1; paragraphs

[1000] to

[8005] ,The term "building block”, as used herein, comprises compounds, which are in a gaseous or liquid state under standard conditions of 0°C and 0.1 MPa. Building blocks are typically used in chemical industry to form secondary products, which provide a higher structural complexity and / or higher molecular weight than the building block on which the secondary product is based. The building block is preferably selected from the group consisting of hydrogen, carbon monoxide, carbon dioxide, ethylene oxide, ethylene glycols, syngas comprising a mixture of hydrogen and carbon monoxide, alkanes, alkenes, alkynes and aromatic compounds. The alkanes, alkenes, alkynes and aromatic compounds comprise in particular 1 to 12 carbon atoms, respectively.The term "monomer”, as used herein, comprises molecules, which can react with each other to form polymer chains by polymerization. The monomer is preferably selected from the group consisting of (meth)acrylic acid, salts of (meth)acrylic acid; in particular sodium, potassium and zinc salts; (meth)acrolein and (meth)acrylates. (Meth)acrylates comprising 1 to 22 carbon atoms are preferred, in particular comprising 1 to 8 carbon atoms. The terms (meth)acrylic acid, (meth)acrolein or (meth)acrylate relate to acrylic acid, acrolein or acrylate and also to methacrylic acid, methacrolein or methacrylate, where applicable. Further, the monomer can be selected from hexamethylenediamine (HMD) and adipic acid.The building block can further be an intermediate compound. The term "intermediate compound”, as used herein, comprises organic reagents, which are applied for formation of compounds with higher molecular complexity. The intermediate compound can be selected for example from the group consisting of phosgene, polyisocyanates and propylene oxide. The polyisocyanates are in particular aromatic di- and polyisocyanates, preferably toluene diisocyanate (TDI) and / or diphenylmethane diisocyanate (MDI).The building block and the monomer and typical converting step(s) to obtain the building block or monomer are described in more detail in paragraphs

[1000] to

[1012] of Reference RF1.The term "polymer A”, as used herein, comprises thermoplastic, e.g., polyamide or thermoplastic polyurethane, thermoset, e.g., polyurethane, elastomer, e.g., polybutadiene, or a copolymer or a mixture thereof and is defined in more detail in paragraphs

[2001] to

[2007] of Reference RF1.The term "polymer composition A”, as used herein, comprises all compositions comprising a polymer as described above and one or more additive(s), e.g. reinforcement, colorant, modifier and / or flame retardant, and is defined in more detail in paragraph

[2008] of Reference RF1.The term "polymer product A”, as used herein, comprises any product comprising the polymer A and / or polymer composition A as described above and is defined in more detail in paragraphs

[2009] and

[2010] of Reference RF1.The step(s) to obtain the polymer, preferably polymer A, polymer composition, preferably polymer composition A or polymer product, preferably polymer product A is / are described in more detail in paragraph

[2011] of Reference RF1 .The term "industrial use polymer”, as used herein, comprises rheology, polycarboxylate, alkoxylated polyalkylenamine, alkoxylated polyalkylenimine, polyether-based, dye inhibition and soil release cleaning polymers defined in more detail in paragraphs

[3035] to

[3044] of Reference RF1. The term "industrial use surfactant”, as used herein, comprises non-ionic, anionic and amphoteric industrial use surfactants defined in more detail in paragraphs

[3008] to

[3034] of Reference RF1. The term "industrial use descaling compound”, as used herein, comprises nonphosphate based builders (NPB) and phosphonates (CoP) described in more detail in paragraphs

[3001] to

[3005] of Reference RF1. The term "industrial use biocide”, as used herein, refers to a chemical compound that kills microorganisms or inhibits their growth or reproduction defined in more detail in paragraphs

[3006] to

[3007] of Reference RF1. The term "industrial use solvent”, as used herein, comprises alkyl amides, alkyl lactamides, alkyl esters, lactate esters, alkyl diester, cyclic alkyl diester, cyclic carbonates, aromatic aldehydes and aromatic esters defined in more detail in paragraphs

[3045] to

[3055] of Reference RF1. The term "industrial use dispersant”, as used herein, comprises anionic and non-ionic industrial use dispersants defined in more detail in paragraphs

[3056] to

[3058] of Reference RF1 . The term "composition and / or formulation thereof' with reference to the industrial use polymers, industrial use surfactants, descaling compounds and / or industrial use biocides refers to industrial use compositions and / or institutional use products and / or fabric and home care products and / or personal care products defined in more detail in paragraph

[3059] of Reference RF1. The converting step(s) to obtain the industrial use polymer, industrial use surfactant, de-scaling compound and / or industrial use biocide are defined in more detail in paragraph

[3060] of Reference RF1 . The converting steps to obtain the industrial use composition or formulation of the industrial use polymer, industrial use surfactant, descaling compound and / or industrial use biocide are defined in more detail in paragraph

[3061] of Reference RF1.The term "agrochemical composition”, as used herein, typically relates to a composition comprising an agrochemically active ingredient and at least one agrochemical formulation auxiliary. Examples of agrochemical compositions, active ingredients and auxiliaries are described in more detail in Reference RF1, paragraph

[4001] ,The agrochemical composition may take the form of any customary formulation. The agrochemical compositions are prepared in a known manner, e.g. described by Mollet and Grubemann, Formulation technology, Wiley VCH, Weinheim, 2001; or Knowles, New developments in crop protection product formulation, Agrow Reports DS243, T&F Informa, London, 2005. The converting step(s) to obtain the agrochemically active ingredients and auxiliaries may be conducted in analogy to the production step(s) of their analogues that are based on petrochemicals or other precursors that are not gained by recycling processes. In addition, conversion to compounds mentioned in sections"Polymer” and "Cosmetic surfactant, emollient, wax, cosmetic polymer, UV filter, further cosmetic ingredient or compositions or formulations thereof” may be performed as described in these sections as well as the respective paragraphs in Reference RF1.The term active pharmaceutical ingredients and / or intermediates thereof, as used herein, comprises substances that provide pharmacological activity or other direct effect in the diagnosis, cure, mitigation, treatment, or prevention of disease, or to affect the structure or any function of the body. Intermediates thereof are isolated products that are generated during a multi-step route of synthesis of an active pharmaceutical ingredient. The term pharmaceutical excipients, as used herein, comprises compounds or compound mixtures used in compositions for various pharmaceutical applications, which are not substantially pharmaceutically active on itself. Active pharmaceutical ingredients and / or intermediates thereof and pharmaceutical excipients are defined in more detail in paragraph

[5001] of Reference RF1.The converting step(s) to obtain the active pharmaceutical ingredients and / or intermediates thereof and pharmaceutical excipients may comprise one or more synthesis steps and can be performed by conventional synthesis and techniques well known to a person skilled in the art.The terms animal feed additives, human food additives, dietary supplements, as used herein, comprises Vitamins, Pro-Vitamins and active metabolites thereof including intermediates and precursors, especially Vitamin A, B, E, D, K and esters thereof, like acetate, propionate, palmitate esters or alcohols thereof like retinol or salts thereof and any combinations thereof; Tetraterpenes, especially isoprenoids like carotenoids and xanthophylls including their intermediates and precursors as well as mixtures and derivates thereof, especially beta carotene, Canthaxanthin, Citranaxanthin, Astaxanthin, Zeaxanthin, Lutein, Lycopene, Apocarotenoids, and any combinations thereof; organic acids, especially formic acid, propionic acid and salts thereof, such as sodium, calcium or ammonium salts, and any combnations thereof, such as but not limited to mixtures of formic acid and sodium formiate, propionic acid and ammonium propionate, formic acid and propionic acid, formic acid and sodium formiate and propionic acid, propionic acid and sodium propionate and formic acid and sodium formiate; glycerides of carboxylic acids and short and medium chain fatty acids, conjugated linoleic acids, such as omega-6 fatty acid (C18:2) methyl ester and 1,2- propandiol and beverage stabilizers, such as polyvinylpyrrolidone-polymer or polyvinylimidazole / polyvinylpyrrolidone- copolymer. Animal feed additives, human food additives and dietary supplements are defined in more detail in paragraph

[5002] of Reference RF1.The converting step(s) to obtain the animal feed additives, human food additives, dietary supplements may comprise one or more synthesis steps and can be performed by conventional synthesis and techniques well known to a person skilled in the art.The terms aroma chemical and aroma composition as used herein, comprise a volatile organic substance with a molecular weight between 70-250 g / mol comprising a functional group with a carbon skeleton of C5-C16 carbon atoms comprising linear, branched, cyclic, for example with a ring size of C5-C18, bicyclic or tricyclic aliphatic chains and but not necessarily one or more unsaturated structural elements like double bonds, triple bonds, aromatics or heteroaromatics and preferably the one or more additional functional groups are selected from alcohol, ether, ester, ketone, aldehyde, acetal, carboxylic acid, nitrile, thiol, amine. In one aspect, the aroma chemical is a terpene-based aroma chemical, for example selected from monoterpenes and monoterpenoids, sesquiterpenes and sesquiterpenoids, diterpenes, triterpenes or tetraterpenes. Aroma chemicals can be combined with further aroma chemicals to give an aroma composition. Aroma chemicals and aroma compositions are defined in more detail in paragraph

[5003] of Reference RF1.The converting step(s) to obtain the aroma chemical and aroma composition may comprise one or more synthesis steps and can be performed by conventional synthesis and techniques well known to a person skilled in the art.The term "aqueous polymer dispersion”, as used herein, comprises aqueous composition(s) comprising dispersed polymer(s) and is defined in more detail in the section

[6001] entitled "aqueous polymer dispersion” of Reference RF1. The dispersed polymer(s) may be selected from acrylic emulsion polymer(s), styrene acrylic emulsion polymer(s), styrene butadiene dispersion(s), aqueous dispersion(s) comprising composite particles, acrylate alkyd hybrid dispersion(s), polyurethane(s) (including UV-curable polyurethanes) and polyurethane - poly(meth)acrylate hybrid polymer(s). The term "emulsion polymer”, as used herein, comprises polymer(s) made by free-radical emulsion polymerization. Aqueous polyurethane dispersion(s) are defined in more detail in the section

[6002] entitled "Polyurethane dispersions” of Reference RF1. UV-curable polyurethane(s) is / are defined in more detail in the section

[6017] of Reference RF1. Polyurethane - poly(meth)acrylate hybrid polymer(s) is / are defined in more detail in the section

[6016] of Reference RF1.The term "polymeric dispersant”, as used herein, comprises preferably polymer(s) comprising polyether side chain, in particular polycarboxylate ether polymer(s) and polycondensation product(s) defined in more detail in paragraph

[6020] entitled "Polymeric dispersant” of Reference RF1.The converting (polymerization) step(s) to obtain the aqueous polymer dispersion(s) comprising emulsion polymer(s) is / are defined in more detail in the section

[6003] entitled "Emulsion polymerization” of Reference RF1.The converting (polymerization) step(s) to obtain the aqueous polyurethane dispersion(s) is / are defined in more detail in the section

[6014] entitled "Process for the preparation of aqueous polyurethane dispersions” and section

[6017] entitled "Aqueous UV-curable polyurethane dispersions, their preparation and use and compositions containing them” of Reference RF1.Composition(s) and uses of aqueous polymer dispersion(s) and of polymeric dispersant(s) are defined in more detail in the following sections of Reference RF1 : section

[6004] entitled "Uses of aqueous polymer dispersions”, section

[6005] entitled "Binders for architectural and construction coatings” section

[6006] entitled "Binders for paper coating” section

[6007] entitled "Binders for fiber bonding” section

[6008] entitled "Adhesive polymers and adhesive compositions” section

[6015] entitled "Aqueous polyurethane dispersions suitable for use in coating compositions” section

[6016] entitled "Aqueous polyurethane - poly(meth)acrylate hybride polymer dispersions suitable for use in coating compositions” section

[6017] entitled "Aqueous UV-curable polyurethane dispersions, their preparation and use and compositions containing them” section

[6018] entitled "Inorganic binder compositions comprising polymeric dispersants and their use”

[6019] 100% curable coating compositionsUV-crosslinkable poly(meth)acrylate(s) and its / their uses are defined in more detail in section

[6009] entitled "UV- crosslinkable poly(meth)acrylates for use in UV-curable solvent-free hotmelt adhesives and their use for making pressure-sensitive self-adhesive articles” of Reference RF1.Polyisocyanate(s), composition(s) comprising them and their uses are defined in more detail in section

[6010] entitled "Polyisocyanates” of Reference RF1.Hyperbranched polyester polyol(s) and its / their uses are defined in more detail in section

[6011] entitled "Organic solvent based hyperbranched polyester polyols suitable for use in coating compositions” of Reference RF1. The converting step(s) to obtain the hyperbranched polyester polyols is / are defined in more detail in the section

[6012] entitled "Preparation of organic solvent based hyperbranched polyester polyols” of Reference RF1. Coating composition(s) comprising hyperbranched polyester polyol(s), polyisocyanate(s) and additive(s) and substrate(s) coated therewith are defined in more detail in section

[6013] entitled "Organic solvent based two component coating compositions comprising hyperbranched polyester polyols and polyisocyanates” of Reference RF1.Unsaturated polyester polyol(s), solvent-based coating composition(s) comprising said unsaturated polyester polyol(s) and substrate(s) for coating with said coating composition(s) are defined in more detail in section

[6018] entitled "Organic solvent based coating composition comprising unsaturated polyester polyols” of Reference RF1. 100% curable coating composition(s) is / are defined in more detail in section

[6019] of Reference RF1.Polymeric dispersant(s) for inorganic binder compositions is / are defined in more detail in section

[6020] of Reference RF1. The inorganic binder composition(s) comprising the polymeric dispersants and their use are defined in moredetail in section

[6021] of Reference RF1. The converting step(s) to obtain the polymeric dispersant(s) are defined in more detail in section

[6020] of Reference RF1. The term "inorganic binder composition” comprising the polymeric dispersant(s), as used herein, comprises preferably in particular hydraulically setting compositions and compositions comprising calcium sulfate and is defined in more detail in section

[6021] of Reference RF1 entitled "Inorganic binder compositions comprising the polymeric dispersant and their use”. Specific building material formulation(s) comprising polymeric dispersant(s) or building product(s) produced by a building material formulation comprising a polymeric dispersant are disclosed in more detail in section

[6021] of Reference RF1.The term "cosmetic surfactant”, as used herein, comprises non-ionic, anionic, cationic and amphoteric surfactants and is defined in more detail in paragraph

[7002] of Reference RF1. The term "emollient”, as used herein, refers to a chemical compound used for protecting, moisturizing, and / or lubricating the skin and is defined in more detail in paragraph

[7003] of Reference RF1. The term "wax”, as used herein, comprises pearlizers and opacifiers and is defined in more detail in paragraph

[7004] of Reference RF1. The term "cosmetic polymer”, as used herein, comprises any polymer that can be used as an ingredient in a cosmetic formulation and is defined in more detail in paragraph

[7005] of Reference RF1. The term "UV filter”, as used herein, refers to a chemical compound that blocks or absorbs ultraviolet light and is defined in more detail in paragraph

[7006] of Reference RF1. The term "further cosmetic ingredient”, as used herein, comprises any ingredient suitable for making a cosmetic formulation. Several sources disclose cosmetically acceptable ingredients. E. g. the database Cosing on the internet pages of the European Commission discloses cosmetic ingredients and the International Cosmetic Ingredient Dictionary and Handbook, edited by the Personal Care Products Council (PCPC), discloses cosmetic ingredients. The term "composition and / or formulation thereof” with reference to the cosmetic surfactant, emollient, wax, cosmetic polymer, UV filter and / or further cosmetic ingredient refers to personal care and / or cosmetic compositions or formulations defined in more detail in paragraph

[7007] of Reference RF1. The converting step(s) to obtain the cosmetic surfactant, emollient, wax, cosmetic polymer, UV filter or further cosmetic ingredient is / are defined in more detail in paragraph

[7008] of Reference RF1.The terms "polymer B”, "polymer composition B”, "coating composition”, "other functional composition”, "foil”, "molded body”, "coating” and "coated substrate” are well known to the person skilled in the art and are defined in more detail from paragraph

[8000] to

[8005] of Reference RF1.In one embodiment, the method may comprise separating a polymer blend, wherein the polymer blend comprises(i) a polyester and(ii) one or more component(s) selected from the group consisting of a second polymer, a third polymer, a colorant, and an additive, wherein second polymer and third polymer are different from each other and different from the polyester of (i); the method comprising:(a) providing the polymer blend and providing a solvent comprising gamma valerolactone (GVL);(b) contacting the polymer blend with the solvent comprising GVL at a temperature T1 of < 170 °C, thereby obtaining a solvent comprising GVL, which is enriched in dissolved optional second polymer, in optional colorant and in optional additive or a part thereof; and a residue of the polymer blend, which is depleted of optional second polymer, of optional colorant and of optional additive or part thereof; and comprises the polyester, optionally the third polymer; and the optional additive or a part thereof; and / or(c) contacting the polymer blend provided in step (a) or the residue of the polymer blend obtained in step (b) with a solvent comprising GVL at a temperature T2 of > 170°C, thereby obtaining a solvent, which comprises GVL and which is enriched in dissolved polyester compared to the solvent provided in step (a) and comprises optionally at least a part of the additive, and optionally a residue of the polymer blend, which is depleted of polyester and comprises optionally the third polymer and optionally the additive or a part thereof.In another embodiment, T1 according to step (b) is in the range of from110 to < 170°C, preferably a temperature in the range of from 110 to 165 °C, more preferably a temperature in the range of from 120 to 160 °C.In another embodiment, T2 according to step (c) is in the range of from > 170°C to 200 °C, preferably a temperature in the range of from 180 to 195 °C.In another embodiment, the solvent comprises GVL and optionally one or more solvent(s) selected from the group consisting of water and organic solvents having a log KOW in the range of from -1.6 to +1.6, more preferably selected from the group consisting of water, C5 to C12 alkane, aliphatic C1 to C10 alcohol, C3 to C10 ketone, C2 to C10 cyclic ketone, HO-[C1 to C10 alkyl-O-]n-H, with n being an integer in the range of from 2 to 1000, C1 to C10 alkyl-O-C3 to C10 alkyl ether, C3 to C10 cyclic ether, optionally substituted with one or more C1 to C6 alkyl group(s), C6 to C10 aromatic hydrocarbon, optionally substituted with one or more C1 to C6 alkyl group(s), C2 to C10 aliphatic ester, C8 to C11 aromatic ester, C5 to C10 cyclic carboxylic ester (lactone), C3 to C12 amide, preferably R1R2N- C(=O)-R3, wherein R1, R2 are independently a C1 to C4 alkyl group and R3 is selected from the group consisting of C1 to C9 alkyl group, C1 to C10 ester group and C1 to C6 ether group, C3 to C6 lactame, optionally substituted with one or more substituent selected from C1 to C6 alkyl group, C1 to C6 ester group and C1 to C6 ether group, and C5 imidazolidine, optionally substituted with one or more C1 to C6 alkyl group(s), C5 to C7 imidazolidone, optionally substituted with one or more C1 to C6 alkyl group(s), wherein preferably at least 1 weight-%, more preferably at least 5 weight-%, more preferably at least 10 weight-%, more preferably at least 20 weight-%, more preferably at least 30 weight-%, more preferably at least 40 weight-%, more preferably at least 50 weight-%, more preferably at least 60 weight-%, more preferably at least 70 weight-%, more preferably at least 80 weight-%, more preferably at least 90 weight-%, more preferably at least 95 weight-% of the solvent consists of GVL, based on the total weight of the solvent being 100 weight-%.In another embodiment, in step (b) and step (c) the same solvent comprising GVL is used.In another embodiment, the polyester is based on 1 ,4-butanediol or 1 ,2-ethandiol, more preferably the polyester according to (I) is selected from the group consisting of a polymer based on 1 ,4-butanediol and terephthalic acid (polybutylene terephthalate, PBT), a polymer based on 1 ,2-ethanediol and terephthalic acid (polyethylene terephthalate, PET), a co-polymer of 1 ,4-butanediol, adipic acid and terephthalic acid (polybutylenadipat-terephthalat, PBAT), a polymer of 1 ,2-ethanediol and 2,5-furandicarboxylic acid (polyethylene furanoate, PEF) and mixtures of two or more of these (co)polymers, more preferably, the polyester comprises at least PET or PBT, more preferably the polyester is PET or PBT or a mixture of PET and PBT.In another embodiment, the second polymer is selected from the group consisting of polyurethane (PU), polyethylene glycol (PEG), polytetrahydrofuran (pTHF), mixtures of these polymers and copolymers of these polymers.In another embodiment, the colorant is selected from the group consisting of dye and optical brightener and mixtures of dye and optical brightener.In another embodiment, the additive is selected from the group consisting of softener, water repellent, flame retardant, UV filter, plasticizer, filler and mixtures of two or more thereof.In another embodiment, step (b) and / or step (c) are done in a gaseous atmosphere comprising at least one inert gas, preferably in a gaseous atmosphere comprising nitrogen.In another embodiment, step (b) and / or step (c) are done at a pressure in the range of from 800 to 1200 hPa, preferably in the range of from 900 to 1100 hPa, more preferably in the range of from 1000 to 1100 hPa or at a pressure pressure in the range of from 1013 to 200,000 hPa, preferably in the range of from 1013 to 100,000 hPa.In another embodiment, the mass-based ratio polymer blend: solvent in step (b) and / or in step (c) is in the range of 1 : 1 to 1 : 100, preferably in the range of from 1 : 1 to 1 :20.In another embodiment, step (b) comprises:(b.1) contacting the polymer blend with the solvent comprising GVL at a temperature T1 of < 170 °C, thereby obtaining a solvent comprising GVL, which is enriched in dissolved optional second polymer, in optional colorant and optionally the additive or a part thereof; and a residue of the polymer blend, which is depleted of said optional second polymer, of said optional colorant and optionally of additive or part thereof; and comprises the polyester, optionally the third polymer; and the optional additive or a part thereof;(b.2) separating the solvent, which is enriched in dissolved optional second polymer, in optional colorant and optionally the additive or a part thereof, and the residue of the polymer blend, which is depleted of said optional second polymer, of said optional colorant and optionally of additive or part thereof; and comprises the polyester, optionally the third polymer; and the optional additive or a part thereof obtained in step (b.1 ), preferably by a physicalseparation method, thereby obtaining a separated solvent, which is enriched in dissolved optional second polymer, in optional colorant and optionally the additive or a part thereof compared to the solvent provided in step (a) and the residue of the polymer blend, which is depleted of said optional second polymer, of said optional colorant and optionally of additive or part thereof; and comprises the polyester, optionally the third polymer; and the optional additive or a part thereof.In another embodiment, step (b) further comprises:(b.3) washing the separated residue of the polymer blend obtained in step (b.2) at least once with a washing solvent comprising GVL and optionally one or more solvent(s) selected from the group indicated above, thereby obtaining a washed residue;(b.4) optionally drying the washed residue obtained in step (b.3).In another embodiment, the third polymer is selected from the group consisting of polyolefins, preferably polyethylene (PE) and polypropylene (PP), polyamide (PA), natural polymer, preferably wool, cotton or viscose, mixtures of two or more of these polymers and copolymers of two or more of these polymers, wherein the third polymer is preferably selected from PA, wool, cotton, viscose and mixtures of two or more of these polymers.In another embodiment, the polymer blend comprises at least a third polymer, the method comprising d) separation of the solvent system, which is enriched in dissolved polyester obtained in step (c) from the residue obtained in step (c), thereby obtaining a solvent enriched in dissolved polyester, which is free of third polymer, and a residue comprising at least the third polymer, wherein the separation is done by heated solid-liquid separation, preferably at a temperature in the range of T ± 20°C, more preferably at a temperature in the range of T ± 10°C.In another embodiment, the method further comprises(e) optionally after heated solid-liquid separation according to step (d), cooling the solvent obtained in step (c) or in step (d), which is enriched in dissolved polyester compared to the solvent provided in (a), to a temperature below T2 preferably below 150°C, more preferably below 140°C, more preferably below 120°C; thereby obtaining a precipitated polyester and a solvent, which is depleted in dissolved polyester.In another embodiment, cooling in step (e) is done without addition of antisolvents.In another embodiment, the method further comprises(f) separating the precipitated polyester obtained in step (e) from the solvent, which is depleted in dissolved polyester, thereby obtaining a precipitated polyester and the solvent, which is depleted in dissolved polyester.In another embodiment, the method further comprises(g) optionally washing the precipitated polyester obtained in step (f);(h) drying the precipitated polyester obtained in step (f) or the washed precipitated polyester obtained in step (g).In another embodiment, separating a polymer blend further comprises recycling solvent re-obtained from one or more step(s), preferably the separated solvent obtained in step (b.2), the washing solvent from step (b.3), the separated solvent of step (d), the separated solvent of step (f), and / or the washing solvent of step (g) at least partially to step (b) and / or step (c), optionally after one or more work-up step(s).In another embodiment, a polyester may be obtained or obtainable from the method as described above, preferably from step (b), step (b.2), step (b.3), step (b.4), step (c), step (d), step (e), step (f), step (g) and / or from step (h) as described above.In a further embodiment, the disclosure refers to use of the polyester as descibred above for preparation of textile applications, fiber applications, packaging applications, plastic applications, automotive applications, electronic applications, preferably for the production of food packaging, beverage packaging, clothing, foot wear, wire, cable, wherein preferably in case that the polyester is selected from PBAT, PEF and PET, preferably PET, the polyester is used for textile applications, fiber applications, packaging applications, plastic applications, more preferably for the production of food packaging, beverage packaging, clothing and foot wear; wherein in case that the polyester is PBT, the polyester is used in textile applications, automotive applications, electronic applications, more preferably for the production of a wire and / or a cable.In a further embodiment, the method for preparing a product comprises(I) providing a polyester as described above;(II) preparing a textile, a fiber, a packaging, a plastic, an automotive part, an electronic part from the polyester provided in (I).In a further embodiment, the method comprises the step of converting the polyester obtained or obtainable from the method as described above, preferably from step (b), step (b.2), step (b.3), step (b.4), step (c), step (d), step (e), step (f), step (g) and / or from step (h) as described above or the second polymer obtained or obtainable from the method as described above, or a third polymer obtained or obtainable from the method as described above, or a chemical material obtainable by or obtained by the method as described above, to obtain a product PRF1.In one embodiment, the product PRF1 is selected from:I) building block or monomer; orII) polymer, preferably polymer A, polymer composition, preferably polymer composition A, or polymer product, preferably polymer product A; or ill) industrial use polymer, industrial use surfactant, descaling compound, industrial use biocide, industrial use solvent, industrial use dispersant, composition thereof or formulation thereof; oriv) agrochemical composition, agrochemical formulation auxiliary or agrochemically active ingredient; or v) active pharmaceutical ingredient or intermediate thereof, pharmaceutical excipient, animal feed additive, human food additive, dietary supplements, aroma chemical or aroma composition; or vi) aqueous polymer dispersion, preferably polyurethane or polyurethane - poly(meth)acrylate hybrid polymer dispersion, emulsion, binder for paper and fiber coatings, UV-curable acrylic polymer for hot melts and coatings polyisocyanates, hyperbranched polyester polyol, polymeric dispersant for inorganic binder compositions, unsaturated polyester polyol or 100% curable composition; or vii) cosmetic surfactant, emollient, wax, cosmetic polymer, UV filter, further cosmetic ingredient or composition or formulation thereof; or viii) polymer B, polymer composition B, coating composition, other functional composition, foil, molded body, coating or coated substrate.In another embodiment, the content of the polyester obtained or obtainable from the method as described above, or of the second polymer obtained or obtainable from the method as described above, or of the third polymer obtained or obtainable from the method as described above, or a chemical material obtainable by or obtained by the method as described above, in the product PRF1 is 1 weight-% or more, preferably 2 weight-% or more, more preferably 5 weight-% or more, more preferably 15 weight-% or more, more preferably 30 weight-% or more, more preferably 40 weight-% or more, more preferably 60 weight-% or more, more preferably 80 weight-% or more, more preferably 90 weight-% or more, more preferably 95 weight-% or more; and / or wherein the content of the polyester obtained or obtainable from the method as described above, or of the second polymer obtained or obtainable from the method as described above, or of the third polymer obtained or obtainable from the method as described above, or a chemical material obtainable by or obtained by the method as described above, in the product PRF1 is 100 weight-% or less, preferably 95 weight-% or less, more preferably 90 weight-% or less, more preferably 50 weight-% or less, more preferably 25 weight-% or less, more preferably 10 weight-% or less; and preferably wherein the content is determined based on identity preservation and / or segregation and / or mass balance and / or book and claim chain of custody models, preferably based on mass balance, preferably the International Sustainability and Carbon Certification (ISCC) standard.In one embodiment, product PRF1 may be obtained or obtainable from the method as described above.In another embodiment, the apparatus for sorting a textile waste stream, in particular a mixed textile waste stream, wherein the textile waste stream includes one or more piece(s) containing textile material, may comprise: an identifier reader configured to detect at least one identifier element per piece, wherein the at least one identifier element is related to at least one decentral identifier associated with the piece; a decentral network communication interface configured to provide the decentral identifier associated with the one or more piece(s) and to provide based on the decentral identifier material composition data and / or piecehistory data, wherein the material composition data and / or piece history data is provided based on the provided decentral identifier by one or more network node(s) of a decentral network; a fractioning unit configured to assign the one or more piece(s) based on the material composition data and / or piece history data to one or more waste fraction(s), wherein the one or more waste fraction(s) relate to a waste fraction to be processed by a solvent-based recycling process; a control signal generator configured to generate, based on the assigned waste fraction, control data for sorting the one or more piece(s) to the assigned waste fraction(s); a control interface configured to provide the generated control data for sorting the one or more piece(s) to the assigned waste fraction(s).In yet another embodiment, the apparatus may be for controlling a sorting process for a textile waste stream comprising a textile piece in a chemical production network, the apparatus comprising: a first input interface configured to retrieve a textile piece identifier associated with at least one of a material composition of the textile piece and a color of the textile piece; an assigning unit configured to assign, based on the textile piece identifier, the textile piece to a waste fraction identifier of a waste fraction; a control data determining unit configured to determine, based on the waste fraction identifier, control data for sorting the textile piece to the waste fraction; and an output interface configured to provide the control data to the sorting process. The apparatus may be applied in a plurality of applications and / or for a plurality of purposes. For example, in recycling, the method may be used to sort waste stream such as textile waste streams. In production, the apparatus may be used to increase quality of the textile waste stream and, thus, of products produced therefrom. The apparatus may reduce an environmental impact, such as the PCF, of the products, such as intermediates products and new textiles. The apparatus may use and / or generate data associated with the textile waste stream, such as analytical data. The data may be used for ensuring at least one of that a particular textile waste stream is suitable for a process, that a particular textile waste stream is suitable for an intended use with regard to quality, a property such as chemical property or mechanical property, and that a particular process is suitable for the textile, for example. The method may allow for digital twinning of the textile(s) and / or industrial process(es).In a further embodiment, control data as provided according to one of the computer-implemented methods for controlling the sorting process for the textile waste stream may be used.In yet a further embodiment, system may comprise the textile waste stream and control data provided according to one of the computer-implemented methods for controlling the sorting process for the textile waste stream.In another embodiment, computer program element with instructions, which when executed on a computer may be configured to carry out one of the computer-implemented methods for controlling the sorting process for the textile waste stream. The computer may be a computing node, for example. In another embodiment, the computer-readablemedium storing data may be generated according to one of the computer-implemented methods for controlling the sorting process for the textile waste stream.In an embodiment of the computer-implemented method, retrieving the textile piece identifier comprises at least one of determining the material composition of the textile piece, determining the color of the textile piece and reading a mark on the textile piece, the mark being associated with the textile piece identifier.The method and / or corresponding apparatus may allow sorting the textile piece(s) more precisely. Thus, they may allow providing improved treatment of the textile waste streams. For example, each of the waste streams may be processed in a tailored, suitable, and / or optimal way, according to its material composition and / or color.In another embodiment of the computer-implemented method, the mark is associated with the at least one of a machine-readable code, a bar code, a quick response (QR) code, a device, an internet-of-things (loT) device, a radio-frequency identification (RFID) device, a near-field communication (NFC) device, an integrated circuit (IC); a chip, a label, a printed circuit, a sticker, a tag and a transponder.The method and / or corresponding apparatus may allow improved sorting of the textile piece(s). The mark, machine- readable code, bar code or QR code may be represented on at least one of the textile pieces, a label, a tag or a packaging. The label or tag may be attached to the textile piece. The packaging may comprise the textile piece. The mark, machine-readable code, bar code or QR code may also be associated with the DPP, for example.In another embodiment of the computer-implemented method, determining the material composition comprises using at least one of a spectrometer, mid-infrared (mid-IR) spectrometer, near-infrared (near-IR) spectrometer, visible (vis) spectrometer and ultraviolet (UV) spectrometer.The method and / or corresponding apparatus may allow processing and / or sorting of any textile piece(s) without a need to fit the textile piece(s) with the mark or the like. Thus, the method and / or corresponding apparatus may allow processing a larger amount of textile pieces produced.In another embodiment of the computer-implemented method, determining the color comprises using at least one of a color meter, a camera, a camera with image processing, a camera with image recognition, a multispectral camera, an image sensor, a hyperspectral sensor, a hyperspectral imager, and a hyperspectral scanner.The method and / or corresponding apparatus may allow determining the color more precisely. Thus, they may allow providing improved treatment of the textile waste streams.In another embodiment of the computer-implemented method, assigning the textile piece to the waste fraction identifier comprises obtaining, based on the textile piece identifier, at least one of product data associated with the textile piece and a digital product passport of the textile piece.The method and / or corresponding apparatus may use the product data associated with the textile piece and / or information of the digital product passport for the sorting process. This may further increase efficiency and accuracy of the sorting process. Thus, they may increase quality of the waste fraction, and a product subsequently made therefrom. They may allow participating in a material loop, such as a circular material loop, closed material loop and open material loop, for example.In another embodiment, the computer-implemented method further comprises: providing a decentral identifier associated with the textile piece; and collecting, based on the decentral identifier, textile piece data associated with the textile piece, wherein the textile piece data comprises at least one of material composition data associated with the material composition of the textile piece and color data associated with the color of the textile piece.The method and / or corresponding apparatus may allow participating in a decentral network associated with the material loop. Thus, they may allow improving movement of products comprising primary products such as polymers, intermediate products such as fabric and yarn, and end-products such as clothing around a circular economy. The decentral identifier may be represented as the mark, a machine-readable code, bar code or a quick response (QR) code, for example.In another embodiment, the computer-implemented method further comprises: generating waste fraction data associated with the waste fraction comprising the textile piece, wherein the waste fraction data comprise associated with at least one of a material composition of the waste fraction and a color of the waste fraction; providing corresponding decentral identifier associated with the waste fraction; and attributing the waste fraction data to the other decentral identifier.The method and / or corresponding apparatus may allow further improving the movement of the products around the circular economy.In another embodiment of the computer-implemented method, the textile waste stream is a mixed textile waste stream.The method and / or corresponding apparatus may allow routing the mixed textile waste stream for processing in a tailored, suitable, and / or optimal way, according to its material composition and / or color of the mixed textile waste stream.In another embodiment of the computer-implemented method, the waste fraction is a textile waste fraction.The method and / or corresponding apparatus may allow sorting the textile piece(s) more precisely into textile waste fractions.In another embodiment of the computer-implemented method, the waste fraction is to be processed by a recycling process.The method and / or corresponding apparatus may allow increasing the amount of recycled textile pieces.In another embodiment of the computer-implemented method, the recycling process is a solvent-based recycling process using a solvent.The method and / or corresponding apparatus may allow turning the textile piece(s) into a valuable recycling material stream. They may allow reducing energy consumption. They may allow reducing sensitivity of the process to contaminations and / or constituent.In another embodiment of the computer-implemented method, the solvent comprises at least one of a solvent obtained from a biological source, gamma-valerolactone (GVL), dimethylacetamide (DMAc), dimethylformamide (DMF), dimethylsulfoxide (DMSO), n-butylpyrrolidone (NBP), and n-methylpyrrolidone (NMP).The method and / or corresponding apparatus may allow recycling the textile piece(s) comprising polymer blend I textile waste input using a solvent reducing the environmental impact and / or PCF. For example, GVL is readily biobased and may be obtained from a biological source. GVL does not bear adverse signs of general systemic toxicity. GVL does not bear adverse signs of reproductive toxicity (reprotoxicity) for mother, and an unborn or a nursed infant. The PCF of, for example, polyamide (PA) and polyethylene terephthalate (PET), recycled using a GVL-based solvolysis may be lower than the PCF of virgin PA and / or PET produced from a fossil input. Different input streams, which may comprise complex fiber mixtures, can be separated. For example, PET and cotton may be separated, elastane may be removed, and PET may be decolorized.In another embodiment of the apparatus, retrieving the textile piece identifier comprises at least one of determining the material composition of the textile piece, determining the color of the textile piece and reading a mark on the textile piece, the mark being associated with the textile piece identifier.In another embodiment of the apparatus, the mark is associated with the at least one of a machine-readable code, a bar code, a quick response code, a device, an internet-of-things device, a radio-frequency identification device, anear-field communication device, an integrated circuit; a chip, a label, a printed circuit, a sticker, a tag and a transponder.In another embodiment of the apparatus, determining the material composition comprises using at least one of a spectrometer, mid-infrared spectrometer, near-infrared spectrometer, visible spectrometer and ultraviolet spectrometer.In another embodiment of the apparatus, determining the color comprises using at least one of a color meter, a camera, a camera with image processing, a camera with image recognition, a multispectral camera, an image sensor, a hyperspectral sensor, a hyperspectral imager, and a hyperspectral scanner.In another embodiment of the apparatus, assigning the textile piece to the waste fraction identifier comprises obtaining, based on the textile piece identifier, at least one of product data associated with the textile piece and a digital product passport of the textile piece.The apparatus may use the product data associated with the textile piece and / or information of the digital product passport for the sorting process. This may further increase efficiency and accuracy of the sorting process. This may increase quality of the waste fraction and a product subsequently made therefrom.In another embodiment, the apparatus further comprises: a second input interface configured to provide a decentral identifier associated with the textile piece; and a third input interface configured to collect, based on the decentral identifier, textile piece data associated with the textile piece, wherein the textile piece data comprises at least one of material composition data associated with the material composition of the textile piece and color data associated with the color of the textile piece.In another embodiment of the apparatus, further comprising: a waste fraction data generating unit configured to generate waste fraction data associated with the waste fraction comprising the textile piece, wherein the waste fraction data comprise associated with at least one of a material composition of the waste fraction and a color of the waste fraction; another output interface configured to provide corresponding decentral identifier associated with the waste fraction; and an attributing unit configured to attribute the waste fraction data to the other decentral identifier.In another embodiment of the apparatus, the textile waste stream is a mixed textile waste stream.In another embodiment of the apparatus, the waste fraction is a textile waste fraction.In another embodiment of the apparatus, the waste fraction is to be processed by a recycling process.In another embodiment of the apparatus, the recycling process is a solvent-based recycling process using a solvent.In another embodiment of the apparatus, the solvent comprises at least one of a solvent obtained from a biological source, gamma-valerolactone, dimethylacetamide, dimethylformamide, dimethylsulfoxide, n-butylpyrrolidone, and n- methylpyrrolidone.In yet another embodiment, composition data and / or piece history data may be used for sorting a textile waste stream into one or more waste fraction(s) according to the method as recited herein or by the apparatus as recited herein.In yet another embodiment, a decentral data consuming network node or data consuming service may be configured to provide the composition data and / or piece history data for sorting a textile waste stream into one or more waste fraction(s) according to the method as recited herein or by the apparatus as recited herein.BRIEF DESCRIPTION OF THE DRAWINGSIn the following, the present disclosure is further described with reference to the enclosed figures.Fig.1 illustrates an example embodiment of a circular material loop including material participants connected through a decentral network with decentral network nodes associated with material participants.Fig. 2 illustrates an example of a sensor-based sorting system for sorting textile waste including sensors and separation mechanisms.Fig. 3 illustrates an example of waste fraction separation by the sensor-based sorting system.Fig. 4 illustrates an example of a chemical production network with multiple input material streams and multiple processes.Fig. 5 illustrates another example of a chemical production network with multiple input material streams and multiple processesFigs. 6a, b illustrate example data structures used for the intelligent sorting method based on material composition data and / or piece history data accessible by way of the decentral network inter-face.Fig. 7 illustrates an example of a method or apparatus for providing material composition data and / or piece history data by way of the decentral network.Fig. 8 illustrates an example of the pre-defined classification configured to separate textile pieces by material composition, piece history and recycling process.DETAILED DESCRIPTIONThe following embodiments are mere examples for implementing the method, system or application device disclosed herein and shall not be considered limiting.The present disclosure has been described in conjunction with preferred embodiments and examples as well. However, other variations can be understood and effected by those persons skilled in the art and practicing the claimed disclosure, from the studies of the drawings, this disclosure and the claims.Any steps presented herein can be performed in any order. The methods disclosed herein are not limited to a specific order of these steps. It is also not required that the different steps are performed at a certain place or in a certain computing node of a distributed system, I. e. each of the steps may be performed at different computing nodes using different equipment I data processing.As used herein, "determining” also comprises "initiating or causing to determine”, "generating” also comprises "initiating and / or causing to generate” and "providing” also comprises "initiating or causing to determine, generate, select, send and / or receive”. The wording "initiating or causing to perform an action” comprises any processing signal that triggers a computing node or device to perform the respective action.In the claims as well as in the description, the word "comprising” or "including”, or similar wording does not exclude other elements or steps and shall not be construed limiting to elements or steps outlined. The indefinite article "a” or "an” does not exclude a plurality. A single element or other unit may fulfil the functions of several entities or items recited in the claims. The mere fact that certain measures are recited in the mutual different dependent claims does not indicate that a combination of these measures cannot be used in an advantageous implementation, or that further elements may be comprised.The wording "providing data” in the scope of this disclosure may comprise any interface configured to provide data. This may comprise an application programming interface (API), a human-computer interface or human-machine interface such as a display, and / or a software module interface. The wording "providing data” may comprise communication of data or submission of data to the interface, in particular display of data to a user, or use of data by the receiving entity.The term "textile" represents any fiber-based material (fiber material), for example, fibers, natural fibers, synthetic fibers, yarns, filaments, threads, fabrics, woven fabrics, non-woven fabrics, felt, knitted fabrics, crocheted fabrics, textile products, textile goods and clothes. Textiles may be divided in groups comprising, for example, consumer textiles and technical textiles. The consumer textiles may be used for domestic purposes. For the consumer textiles, important aspects may comprise, for example, aesthetics and comfort. The technical textiles may comprise, for example, geotextiles, industrial textiles and medical textiles. For technical textiles, important aspects may comprise, for example, functional properties.The term "textile waste” represents discarded and / or unwanted materials generated during production, consumption and disposal of textiles. Textile waste may arise from various stages within a textile supply chain, comprising manufacturing, retail and consumer use. Textile waste may be categorized into two main waste streams: a postindustrial (PI) I pre-consumer waste stream and a post-consumer (PC) waste stream:PI waste, also known as industrial waste or factory waste, may occur during a manufacturing process. The PI waste may comprise at least one of production scraps, cutting room leftovers, defective fabrics, rejected fabrics, and other materials that do not meet quality standards. The PI waste may also comprise excess inventory or unsold product(s) from manufacturer(s) or retailer(s).PC waste represents textile waste generated by end-users such as consumers. The PC waste may comprise discarded clothing, household textiles, and other textile products that have reached their end-of-life (EoL) cycle. The PC waste may result from factors comprising at least one of fashion trends, changes in personal preferences, wear and tear, and product obsolescence.Textile waste may have a significant environmental impact and / or social impact. Textile waste may contribute to landfill waste, consume valuable resources, and / or release harmful substances when disposed of improperly. However, textile waste also presents an opportunity for recycling, reusing and / or repurposing materials to reduce an environmental footprint of the textile industry.The term "Extended Producer Responsibility” (EPR) represents a policy tool for extending responsibility of manufacturers and / or retailers for their product(s) to comprise an EoL management thereof. An EPR program may involve, for example, implementing a take-back program, supporting recycling infrastructure, or designing products for easier disassembly and recycling.The term "polymer” represents any very large molecule (macromolecule) forming fiber-based material, for example, a natural polymer, cellulose, cotton, silk, wool, synthetic polymer, polyamide (PA), polycaprolactam (poly(azepan-2- one), poly(hexano-6-lactam), PA 6, Nylon 6), poly(hexamethylene adipamide) (poly[imino(1,6-dioxohexamethylene) iminohexamethylene], PA 66, Nylon 66), polyester, polyethylene (PE), polyethylene terephthalate (PET), recycled PET (rPET), and polypropylene (PP).The term "polymer blend” represents a combination of a polymer with another component. The other component may be another polymer. The polymer blend may comprise a plurality of (different) fiber materials. The other component may be an additive. The polymer blend may comprise a plurality of (different) additives. The polymer and the other component may be combined with each other in any suitable way. For example, in case of two polymers, the polymers may be inter-mixed. Additionally or alternatively, the polymer may be embedded in and / or interwoven with the other polymer. Additionally or alternatively, the polymers may be aligned in separate layers or in a hybrid form of these combinations. For example, a polymer blend is a textile comprising elastic fibers and polyamide or a natural polymer such as cotton, viscose or linen. The textile may further comprise a filler or fillers. Additionally or alternatively, the textile may comprise a further polymer, such as polyacrylonitrile (poly (1 -acrylonitrile), PAN), for example. The filler may comprise at least one of glass fiber, coal fiber, carbon black, inorganic salt, talc, disodium carbonate, adhesive, thickener, antifoam agent, finishing agent, water / oil / stain repellent, flame retardant, anti-crease agent, biocide, binder, surfactant, softener, scouring agent, antistatic agent, desizing agent, bleaching agent, oxidant, UV filter, emulsionant, fixing agent, washing dispersant, and profiling agent, for example.The term ''solvent” represents any substance that dissolves a solute, in particular a textile or polymer, resulting in a solution, for example a solvent obtained from a biological source, gamma-valerolactone (GVL), dimethylacetamide (DMAc), dimethylformamide (DMF), dimethylsulfoxide (DMSO), n-butylpyrrolidone (NBP), and n-methylpyrrolidone (NMP).The term "computer” represents any processing device, for example, computing node, processing node, microprocessor, microcontroller, client-server architecture, cloud-based solution.The term "product carbon footprint” (PCF) represents an environmental impact of a (chemical) product produced using an industrial process with an operation unit. The PCF may relate to greenhouse gas (GHG) emissions, carbondioxide (CO2) emissions and / or emissions reflected in carbon-dioxide equivalents (CO2-eq). The PCF may relate to CO2-eq emissions from production within a system boundary of the industrial process, generation of energy purchased for the production, and / or an input material or another input resource provided to the industrial process. The CO2-eq emissions from generation of purchased energy, and / or the input materials or another input resource provided to the industrial processes may be provided for determining the PCF. Data may be provided by a database storing CO2-eq emissions from the generation of purchased energy, and / or the input materials or other input resource.Carbon footprints may be calculated according to known national, regional and / or international standards.Various units, circuits, entities, nodes or other computing components may be described as "configured to” perform a task or tasks. The wording "configured to” shall recite structure meaning "having circuitry that” performs the task or tasks on operation. The units, circuits, entities, nodes or other computing components can be configured to performthe task even when the unit I circuit I component is not operating. The units, circuits, entities, nodes or other computing components that form the structure corresponding to "configured to” may comprise hardware circuits and / or memory storing program instructions executable to implement the operation.The units, circuits, entities, nodes or other computing components may be described as performing a task or tasks, for convenience in the description. Such descriptions shall be interpreted as including the phrase "configured to.In general, the methods, apparatuses, systems, computer elements, nodes or other computing components described herein may include memory, software components and hardware components. The memory can include volatile memory such as random-access memory (RAM), static random-access memory (SRAM) or dynamic randomaccess memory (DRAM) and / or non-volatile memory such as optical or magnetic disk storage, flash memory, readonly memory (ROM), programmable read-only memory (PROM), etc. The hardware components may include any combination of combinatorial logic circuitry, clocked storage devices such as flops, registers, latches, etc., finite-state machines, memory such as static random-access memory or embedded dynamic random-access memory, custom- designed circuitry, programmable logic arrays, etc.Any disclosure and embodiments described herein relate to the methods, systems, apparatuses, devices, chemicals, materials, services, uses, computer program elements outlined above and vice versa. Advantageously, the benefits provided by any of the embodiments and examples equally apply to all other embodiments and examples and vice versa.All terms and definitions used herein are understood broadly and have their general meaning.Fig. 1 illustrates an example embodiment of a circular material loop 100 including material participants 101.1-6 connected through a decentral network 102 with decentral network nodes 103.1-6 associated with material participants 101.1-6.The participant network shown in Fig. 1 may be a material chain network. The material chain network may include one or more linear material chain(s). The linear material chain(s) may include a material supply chain, in which the material is produced by a material producer 101.1 and used to produce an end product by an original equipment manufacturer 101.3 (OEM). The linear material chain(s) may include a material recycling chain, in which the produced end product is collected, sorted and recycled up to a recycling system operator 101.6 and the recyclate is used to produce new material by the material producer 101.1. The material chain may include one or more supply and / or recycling chain(s). The material chain may include one or more connected supply and / or recycling chain(s). One or more linear material chain(s) may be connected to the material loop 100. Participant of material loop 101.1 may be a recycle textile producer and / or a recycled fiber producer. Participant 101.2 may be recycled textile user and / or recycled fiber user. Participant 101.3 may be a recycled textile-based product producer and / or a recycle fiber-based product producer. Participant 101.4 may be a textile product user and / or fiber product user. Participant 101.5 may be a textile waste stream collector and / or a textile waste stream sorter. Participant 101.6 may be a recycling system operator.The material chain network may include a material loop network 100 including the use of recycled material(s) to produce new materials and / or new product using the recycled materials. One or more material loop(s) 100 may allow to use materials resulting from recycling of end-of-life products to produce new products, such as chemical products or materials, associated with one or more material chain(s). The material chain network, preferably the material loop 100, may include the production, use and / or recycling of physical materials and products. The product may be a material, a chemical product, an intermediate chemical product, a component, a component assembly, an end product, an end-of-life product, a product to be recycled, a recycled product or a recyclate.Material or chemical product may refer to a chemical compound, a chemical ingredient, a chemical molecule, a chemical composition, a chemical mixture, a chemical formulation, an intermediate chemical product, or a chemical base material that may be used to produce discrete products. Chemical material or product flows may include nondiscrete material flows that may be further processed to produce discrete products or components. Chemical material or product flows may include liquids, pellets, beats, powders or the like. The discrete product may refer to a component, a component assembly, an end product, an end-of-life product, a product to be recycled, or a recycled discrete product. The recyclate may refer to a mechanically or chemically recycled material. Recyclate or recycled material flows may include non-discrete material flows that may be further processed to produce new materials or chemical products. Recyclate or recycled material flows may include liquids, pellets, beats, powders or the like. Material composition refers to the specific components or elements that make up a particular material or substance. It involves identifying and quantifying the various constituents present in a material, such as metals, polymers, fibers, chemicals, or minerals. Understanding the material composition is important for various purposes, including quality control, product development, recycling, and waste management. It allows for the characterization and analysis of the properties, behavior, and potential uses of a material.End product may refer to a product that is the result of a material supply chain. End product may refer to a product that is used by the end product user. End-of-life (EOL) product may refer to a product that has been used by end product user. End-of-life product may refer to a product that does no longer fulfill the requirements for its use. End-of- life product may refer to a product that is no longer required. End-of-life products may be products disposed in waste, such as textile waste. A recycled product may refer to any product that has been produced using end-of-life product(s). A recycled product may refer to a new product that has been produced using end-of-life product(s).The material loop 100 illustrated in Fig. 1 may include multiple participants 101.1-6 forming the material loop 100. The material loop 100 may include all stages of the material from production of the material via use of the material to reuse of the material. The material may hence flow in a closed loop from production of constituents, the end productvia use to reuse. Reuse may include re-purposing of the end-of-life product, re-furbishing of the end-of-life product and / or recycling of the end-of-life product to refeed recyclate into material production.The participant(s) 101.1-6 of the material loop may be associated with the production of any material or product and / or recycling of any material or product. The participant(s) of the material loop 100 may include the chemical product producer 103.1, the chemical product user 103.2, the original equipment manufacturer, OEM 103.3, the end product user 103.4, the EOL product collector and / or sorter 103.5, the recycling system operator 103.6 and combinations thereof. The participant(s) may include various participant(s) of the material chain or loop not shown in Fig. 1.The participant(s) 101.1-6 of the material loop 100 may be connected through material flow(s) 104. The material flow 104 may correspond to the flow of product or material from one participant 101.1-6 of the material loop to the downstream participant 101.1-6 of the material loop 100. The material flow 104 may refer to a continuous or a discontinuous flow of product or material. The flow of product or material may include any means of transportation suitable to transport the product from one participant 101.1-6 to an-other downstream participant 101.1-6. The means of transportation may include pipes, containers, barrels, packages or the like. The material flow 104 may be a onesided flow, such as a directional material flow 104. The material flow 104 may flow from the upstream participant 101.1-6 to the downstream participant 101.1-6 of the material loop 100, such as the material flow 104 from the recycling system operator 101.6 to the chemical product producer 101.1. The material flow may include reverse material flow 104 from the downstream participant 101.1-6 to the upstream participant 101.1-6 of the material loop 100. For example, material may flow 104 from the chemical product producer 101.1 to the recycling system 101.6, e.g. when the recycled product or recyclate does not adhere to quality specifications and needs further treatment.The material flow 106 may be associated with raw materials used to produce the material or chemical product, such as virgin raw material(s). Virgin raw material may be unused raw material that has not been subjected to any processing other than for its production. Instead of virgin raw material(s) the material flow 104 may include recycled material(s). Recycled material(s) may be made from waste material that can be recycled. The raw and recycled materials may be provided to the chemical product producer for producing material(s), chemical product(s) and / or intermediate chemical product(s) (not shown).The material loop 100 illustrated in Fig. 1 is based on the example of textile materials and their circular loop. Textile materials may include a synthetic material made from a wide range of organic polymers such, but not limited to, as polyethylene, polypropylene, polystyrene, polyethylene terephthalate, polyvinyl carbon, polyamide, polyurethane or the like. The material participants may include the monomer and / or polymer producer 101.1, the monomer and / or polymer user 101.2 such as the compounder, moulder or converter, the original equipment manufacturer 101.3 such as the polymer-containing product producer, the polymer-containing product user 101.4 such as the retailer or the consumer, the waste collector and / or sorter, the recycling system operator 101. 5 such as the recycler or refiner.The monomers and / or polymers may be produced by the chemical producer. The monomers and / or polymers may be provided to a polymer user, such as a compounder, moulder and / or converter. The monomers and / or polymers may be compounded, moulded and / or converted. The compounded, moulded and / or converted polymer may be provided to a polymer-containing product producer (Original Equipment Manufacturer - OEM). The polymer- containing product or piece may be produced using the compounded, moulded and / or converted polymer. The polymer-containing product or piece may be provided to a polymer-containing product user. The polymer-containing product or piece may be used by the user. At the end-of-life the polymer-containing product or piece may be disposed by the user. The disposed polymer-containing product or piece may be provided to the textile waste collector and / or sorter. The disposed polymer-containing product or piece may be collected in a textile waste stream. The textile waste stream may be sorted. The textile waste stream may be provided to a sorter for sorting fractions of polymer-containing products or pieces to be recycled. The sorted fractions of polymer-containing products or pieces may be provided to a recycler for recycling the polymer-containing product fraction. The recycled fraction may be provided to the chemical producer for producing new monomers and / or polymers thus closing the material loop 100. The material flow 104 may close the loop between the material participants.In addition to the connection through material flows 104, the material participants 101.1-6 of the circular material loop 100 may be connected through data flows 105 via the decentral network 102. The decentral network 102 may include one or more decentral network nodes 103.1-6 associated with material participants 101.1-6 of the material loop 100. In a decentralized or decentral network 102, the decentral network nodes 103.1-6, in contrast to a centralized network, do not exclusively rely on a central network node. In other words, no single entity is the sole authority of the network. The decentral network 102 may include decentral and central network nodes. The decentral network 102 may include central network nodes that may control and / or monitor the decentral network nodes 103.1- 6. For example, central network node(s) may provide authentication information, which allows at least two decentral network nodes 103.1-6 to establish a peer to-peer communication channel between respective decentral network nodes 103.1-6.The network nodes 103.1-6 may be computing nodes. The computing node may be any device or system that includes at least one physical and tangible processor, and a physical and tangible memory capable of having thereon computer-executable instructions that are executed by a processor. Computing nodes are now increasingly taking a wide variety of forms. Computing nodes may, for example, be handheld devices, monitoring systems, control systems, laptop computers, desktop computers, mainframes and / or data centers. The memory may take any form and depends on the nature and form of the computing node. The decentral network nodes 103.1-6 may be connected via a wired and / or wireless connection such as one of Ethernet, USB, LAN, WLAN and the like. Wireless communication may use, for example, WLAN, Wi-Fi, cellular, and / or Bluetooth. The decentral network nodes 103.1-6 may be configured to perform peer to-peer data transactions, illustrated by the arrows 105 indicating data flow.The decentral network nodes 103.1-6 may be configured as data consuming and / or providing network nodes. The decentral network nodes 103.1-6 may be configured to provide data to other network node(s) of the decentral network 102 and / or to consume data from other nodes of the decentral network 102. For instance, the decentral network node 103.1,3 associated with the monomer and / or polymer producer 101.1 or the polymer containing product producer 101 .3 may be configured to provide chemical product data associated with properties of the polymer to downstream participants such as the textile waste collector or sorter 101 .5 or the recycling operator 101 .6. Further for instance, the decentral network node 103.5,6 associated with the textile waste collector or sorter 101.5 or the recycling operator 101.6 may be configured to access data from the network node 103.1-5 associated with upstream participants such as the monomer and / or polymer producer 101.1 or the polymer containing product producer 101.3.The decentral network node(s) 103.1-6 may comprise computer-executable instructions configured to provide, consume and / or process data, such as chemical product data associated with the monomer, polymer, polymer- containing product or piece produced or processed within the circular loop 100. The network node(s) may run a data providing service configured to provide data to another decentral network node 103.1-6 of the decentral network 102. The decentral network node(s) 103.1-6 configured to provide data may be associated with a data owner or a data generating node associated with a material or product produced or processed within the circular loop 100. The decentral network node(s) 103.1-6 may be connected to one or more dedicated data storage(s) storing the data associated with material or product produced or processed in the circular loop 100 (see for example Fig. 7). The dedicated data storage(s) may be under control of the data owner or data generating node associated with the material or product produced or processed in the circular loop 100. The data owner may be the respective participant101.1-6 of the circular loop 100, the data generating node 103.1-6 is associated with. The data generating node103.1-6 may have access to the dedicated data storage(s). Access to data associated with material or product produced or processed within the circular loop 100 may hence be under control of the data owner the respective decentral network node 103.1-6 is associated with. This allows to retain full control over data associated with material or product produced or processed within the circular loop 100 by the data owner. At the same time this enables sharing of data associated with material or product produced or processed within the circular loop 100 under controlled conditions, for example by using appropriate protocols including authorization and authentication mechanisms or schemes to establish peer to-peer communication.The decentral network node 103.1-6 configured to consume data may comprise computer-executable instructions for accessing and / or processing data within the decentral network 102, such as data associated with material produced or processed within the circular loop 100 and provided by a decentral data providing network node 103.1-6. The decentral data consuming network node 103.1-6 may be controlled or owned by or associated with any upstream or downstream participant of the circular loop 100. For instance, the decentral data consuming network node 103.4 may be associated with polymer-containing product user 103.4 to allow access to monomer and / or polymer dataassociated with the supplied monomer and / or polymer of the monomer and / or polymer producer through the decentral data providing network node 103.1 associated with the monomer and / or polymer producer 101.1.The decentral network 102 may include further decentral network nodes 103.1-6. The further decentral network nodes 103.1-6 may not be associated with further participants of the circular loop 100. The further nodes may be decentral infrastructure service nodes (not shown in Fig. 1). The decentral infrastructure service nodes may provide services for decentral participant nodes 103.1-6, such as verifying the identity of the decentral network participant nodes 103.1-6 prior to performing a data ex-change. The decentral network participant node(s) 103.1-6 may be associated with or include certificate(s), such as X.509 certificate(s). The certificate(s) may be associated with an identity manager including e.g. a certificate issuing service and / or a dynamic provisioning service providing dynamic attribute tokens (e.g. OAuth Access To-kens). This way the decentral network node(s) 103.1-6 may be associated or connected to a unique identifier embedded in a X.509 certificate that identifies the respective decentral network node(s) 103.1-6. The information required to verify the certificate may be provided via an authentication registry associated with the certificate issuing service and / or a dynamic provisioning service. For instance, in the IDSA Reference Architecture Model, Version 3.0 of April 2019, a decentral data providing network node associated with the data owner, a Certification Authority (CA), a Dynamic Attribute Provisioning Service (DAPS) and a decentral data consuming network node associated with the data consumer are used to verify the identity prior to performing a data exchange (not shown).The material or product produced by participant(s) 101.1-6 of the circular loop 100 may be associated with material or product data associated with properties of the material or product produced by participant(s) 101.1-6 of the circular loop 100. The material or product data may be provided for access by the decentral data providing network node 103.1-6 associated with the material or product producer. Access to the material or product data may be controlled by the decentral data providing network node 103.1-6. The material or product data may be accessed by decentral data consuming network node(s) 103.1-6 associated with further participants 101.1-6 of the material loop 100, such as any downstream participant 101.1-6.The data flow 105 between decentral network nodes 103.1-6 may be directly or indirectly associated with the material flow 104, 106 between the participants 101.1-6 of the material loop 100. For instance, the data flow 105 may be directly associated with the material flow 104, 105, if data associated with a chemical product provided from the chemical product producer 103.1 to the chemical product user 103.2 is accessed by a decentral data consuming network node 103.1-6 associated with said chemical product user 101.2. For instance, the data flow 105 may be indirectly associated with the material flow 104, 106, if data associated with a chemical product produced by chemical product producer 103.1 is accessed by a decentral data consuming network node 103.1-6 associated with the recycling system operator 101.6.Data transactions between decentral network nodes 103.1-6 may be based on a decentral identifier associated with the material or product data to be accessed. The decentral identifier may be associated with the physical entity of the material or product. The decentral identifier may be uniquely associated with the physical entity of the material or product. The decentral identifier may uniquely identify the material or product within the decentral network 102. The decentral identifier may be associated with further decentral identifier(s), such as decentral identifier(s) of material(s) or product(s) used to produce the end product. This may allow to track the material(s) or product(s) used to produce a product, such as an end-product. The decentral identifier may be included in a material passport associated with the material or product as is described in more detail in the context of Fig 8.Chemical recycling, also known as advanced recycling or feedstock recycling, is a process that involves the breakdown of complex polymers into their basic chemical building blocks. This process typically utilizes chemical reactions, such as depolymerization or pyrolysis, to convert into feedstocks or raw materials for the production of new textile, fuels, or other chemicals. Chemical recycling offers the potential to recycle a wider range of plastic waste, including mixed textile and contaminated textile that may not be suitable for traditional mechanical recycling. Solventbased recycling is a specific method of recycling that utilizes solvents to dissolve and separate the components of waste materials. In the context of textile recycling, solvent-based recycling involves the use of solvents, such as gamma-valerolactone (GVL), to dissolve fibers from textile waste. The dissolved fibers can then be separated, purified, and used to produce new textile products. Physical recycling, also known as traditional or mechanical recycling, is a process that involves the physical transformation of waste materials into new products without undergoing significant chemical changes. This process typically includes sorting, cleaning, shredding, and reprocessing of waste materials, such as textile or paper, to produce new products of similar or lower quality. Physical recycling is the most common form of recycling and is widely used for materials like plastic bottles, cardboard, and aluminum cans. Mechanical recycling is often used interchangeably with physical recycling, as both terms refer to the same process. It involves the mechanical processes of sorting, shredding, cleaning, and reprocessing waste materials to create new products. Mechanical recycling is commonly applied to materials like textile, paper, glass, and metals, where the waste is transformed physically without undergoing significant chemical changes.Data related to the textile stream waste may be transfer along the chain value, that is the output data for example of the recycler is then data used the recycled material producer, and the output of the recycling gets transferred to the next step. It should be understood that the data is to be used withing a decentralized system with the corresponding requirements. Identifiers may be implemented as QR, NFC Tags, RFT ID tags attached to the textile / fiber product, stream waste, etc.Textile Waste Stream refers to the flow of discarded textile materials resulting from the production, consumption, and disposal of textile products. This stream is characterized by its chemical composition, which includes various polymer fractions and additives present in the textile materialsPolymer fractions may indicate the types and proportions of synthetic and natural fibers within the textile material. Common polymers include polyester (PET), known for its strength and durability, nylon (PA), valued for its elasticity and abrasion resistance, cotton, recognized for its comfort and breathability, and wool, appreciated for its insulation properties. These polymer fractions may be quantified as a percentage of the total mass of the textile piece, providing insight into the material's recyclability and environmental impact. Additives are chemical substances incorporated into textile materials to enhance properties such as color, durability, and performance. These may include dyes and pigments used for coloring textiles, which may affect the recycling process due to their chemical stability, flame retardants that reduce flammability and may pose environmental and health risks, and antimicrobials intended to prevent microbial growth, potentially complicating disposal and recycling. Less favorable additives are those that may have adverse environmental effects, such as heavy metals or persistent organic pollutants, which can leach into the environment during disposal.Waste fraction refers to the portion of the textile material considered waste, encompassing both unutilized production scraps and discarded consumer products. Analyzing the chemical composition of this waste fraction may be crucial for determining the types and amounts of polymers and additives present, which allows better recycling textile stream waste.Put differently, Fig. 1 illustrates an exemplary circular material loop 100 comprising participants 102.1-102.6 of the material loop 100, connected through a decentral network 120 comprising decentral network nodes 122.1-122.6 associated with the participants 102.1-102.6.The circular material loop 100 may be a material chain network. The material chain network may comprise one or more linear material chain(s), such as production chain(s) and / or recycling chain(s). The linear material chain(s) may comprise one or more material production chain(s), wherein material is produced by a material producer such as chemical product producer and recycled textile I fiber producer 102.1 and used to produce an end-product by an original equipment manufacturer (OEM) such as recycled textile / fiber-based product producer 102.3. The linear material chain(s) may comprise a material recycling chain, wherein the produced end-product is collected, sorted and recycled up to a recycling system operator 102.6, and recyclate obtained therefrom is used to produce new material by the recycled textile / fiber producer 102.1. The material chain may comprise one or more production and / or recycling chain(s). The material chain may comprise one or more connected production and / or recycling chain(s). One or more linear material chain(s) may be connected to the circular material loop 100.The material chain network may comprise the one or more circular material loop(s) 100 comprising the use of recycled material(s) to produce new materials. The circular material loop(s) 100 may allow using materials resulting from recycling of EoL products to produce new products such as chemical products, or materials such as chemical materials, associated with the material chain(s). The material chain network, preferably the circular material loop 100, may comprise the production, use and / or recycling of physical materials or products produced by using suchmaterials or containing such materials. The product may be a material, a chemical product, an intermediate chemical product, a discrete component containing material, a discrete component assembly, an end-product, an EoL product, a product to be recycled, a recycled product or a recyclate.The term "material” or "chemical product” may refer to a chemical compound, a chemical ingredient, a chemical molecule, a chemical composition, a chemical mixture, a chemical formulation, an intermediate chemical product or a chemical base material that may be used to produce discrete products. Chemical material or product flows may comprise non-discrete material flows that may be further processed to produce discrete products or components. Chemical material or product flows may comprise liquids, pellets, beats, powders or the like. The discrete product may comprise the discrete component, discrete component assembly, end-product, EOL product, product to be recycled or recycled product.The chemical material or product may be produced using raw materials and / or recyclate. The recyclate may comprise a mechanically recycled material and / or chemically recycled material. Recyclate or recycled material flows may comprise non-discrete material flows that may be further processed to produce new materials or chemical products. Recyclate or recycled material flows may comprise liquids, pellets, beats, powders or the like. The raw materials may comprise or refer to starting materials used to produce the material or chemical product, such as virgin raw material(s). Virgin raw(s) material may be unused raw material(s) not subjected to any processing other than for production thereof.The term "end-product” may refer to a product that is a result of a material chain. The end-product may refer to a product that is used by the end-product user such as textile I fiber end-product user 102.4. EoL product may refer to a product that has been used by the end-product user. EoL product may refer to a product that does no longer fulfill a requirement for its use. EoL product may refer to a product that is no longer required. An EoL product may be a product disposed in waste, such as plastic waste. A recycled product may refer to any product or material produced using the EoL product(s). A recycled product may refer to a new product or material produced using the EoL product(s).The circular material loop 100 may comprise a plurality of participants 102.1-102.6 forming the circular material loop 100. The circular material loop 100 may comprise all stages of the material from production of the material via use of the material to re-use and / or recycling of the material. The material may hence flow in a closed loop from production of constituents, the end-product via use to re-use I recycling. Re-use may comprise re-purposing of the EoL product, re-furbishing of the EoL product and / or recycling of the EoL product to re-feed recyclate into material production.The participant(s) 102.1-102-6 may be associated with the production and / or recycling of any material(s) and / or product(s). The participant(s) 102.1-102-6 may comprise the recycled textile I fiber producer 102.1, chemical product user such as recycled textile I fiber user 102.2, recycled textile I fiber-based product producer 102.3, textile I fiberproduct 102.4, textile waste stream collector I sorter 102.5, recycling system operator 102.6 or any combinations thereof. The participant(s) 102.1-102-6 may comprise various participant(s) of the material loop or material chain or loop not shown.The participant(s) 102.1-102-6 of the circular material loop 100 may be connected through flow(s) of a product or material such as loop material flow 114. The loop material flow 114 may correspond to the material flow from one participant 102.1-102-6 to another downstream participant 102.1-102-6 within the circular material loop 100. The loop material flow 114 may refer to a continuous or discontinuous flow. The flow may comprise any means of transportation suitable to transport the product or material from one participant 102.1-102-6 to the other downstream participant 102.1-102-6. The means of transportation may comprise pipes, containers, barrels, packages or the like. The flow such as the loop material 114 may be a one-sided flow, such as a directional material flow. The flow may flow from the up-stream participant 102.1-102-6 to the downstream participant 102.1-102-6 of the circular material loop 100, such as the material flow 114 from the recycling system operator 102.6 to the chemical product producer such as the recycled textile I fiber producer 102.1 . The flow may comprise reverse flow from the downstream participant 102.1-102-6 to the upstream participant 102.1-102-6 of the circular material loop 100. For example, material may flow from the chemical product producer such as the recycled textile I fiber producer 102.1 to the recycling system operator 102.6, for example, when the recycled product or recyclate does not adhere to a quality specification and / or needs further treatment.Flow(s) of a product or material may be associated with a raw material flow 116 of raw material(s) used to produce the material or chemical product, such as virgin raw material(s). Virgin raw(s) material may be unused raw material(s) not subjected to any processing other than for production thereof. Additionally or alternatively to virgin raw material(s), the material loop material flow 114 may comprise recycled material(s). The recycled material(s) may be made from waste material that can be and / or has been recycled. The raw materials and / or recycled materials may be provided to the chemical product producer such as the recycled textile I fiber producer 102.1 for producing material(s), chemical product(s) and / or intermediate chemical product(s) (not shown).For example, the circular material loop 100 may be based on feedstock(s) for chemical production network(s) and a corresponding circular loop. The feedstock(s) for chemical production networks may comprise any type of feedstock entering chemical production network(s). The feedstock(s) may comprise raw materials used to produce the material or chemical product, such as virgin raw material(s). The feedstock(s) may refer to fossil feedstock and / or non-fossil feedstock. Examples for fossil feedstock may comprise crude oil, naphtha, methane or the like. The feedstock(s) may comprise alternative feedstock(s) and / or non-fossil feedstock(s) such as recycled feedstock(s), bio-based feedstock(s) and / or renewable feedstock(s). Examples for recycled feedstock(s) may comprise pyrolysis oil, pyrolysis gas, recycled polymer material(s), mechanically recycled polymer material(s) or chemically recycled polymer material(s). Examples for bio-based feedstock(s) or renewable feedstock(s) may comprise bio-based pyrolysis oil, bio-based pyrolysis gas, bio-based synthesis gas, bio-based hydrogen, bio-based naphtha, bio-based methane, bio-based ethane, bio-based propane, bio-based chemicals, renewable pyrolysis oil, renewable pyrolysis gas, renewable synthesis gas, renewable hydrogen, renewable naphtha, renewable methane, renewable ethane, renewable propane and / or renewable chemicals, or any combination(s) thereof.The participants may comprise the chemical producer, chemical user, end-product producer, end-product user such as retailer or consumer, end-product collector or waste collector, waste sorter, and recycling system operator 102.6.The virgin raw material(s) may be provided to the chemical producer as virgin feedstock(s). Additionally or alternatively, non-fossil feedstock(s) such as recycled material(s), bio-based material(s) and / or renewable material(s) may be provided to the chemical producer as feedstock(s). The chemicals may be produced by the chemical producer using the fossil and / or non-fossil feedstock(s). The chemicals may be provided to a chemical user. The chemicals may be used to produce intermediate product(s). The intermediate product(s) may be provided to the endproduct producer. The end-product(s) may be produced using any intermediate product(s) produced upstream. The end-product(s) may be provided to the end-product user(s). The end-product(s) may be used by the end-product user(s). At EoL, the end-product(s) may be disposed by the end-product user(s). The disposed end-product(s) may be provided to the end-product collector and / or sorter. The disposed end-product(s) may be collected in waste stream(s) such as a textile waste stream to be sorted 114.4. The waste stream(s) may be sorted. The waste stream(s) may be provided to the waste sorter for sorting fractions of end-products to be recycled. The sorted fractions of end-products such as a waste fraction to be recycled 114.5 may be provided to the recycling system operator 102.6 for recycling the sorted waste fraction(s). The recycled fraction(s) may be provided to the chemical producer for producing new chemicals, thus closing the circular material loop 100. The loop material flow 114 may close the loop between the participants 102.1-102-6. The material loop may comprise a plurality of production chains comprising material supplier (not shown), chemical producer, chemical user and end-product producer. The material loop may comprise a plurality of recycling chains comprising the waste collector and / or waste sorter, recycling system operator 102.6 and chemical producer.In addition to the connection through the flows, the participants 102.1-102-6 of the circular material loop 100 may be connected through data flow(s) 124 via the decentralized network or decentral network 120. The decentral network 120 may comprise decentral participant node(s), or decentral network node(s), 122.1-122.6 associated with participants 102.1-102-6. In contrast to a centralized network, the decentral network node(s) 122.1-122.6 of the decentral network 120 do not exclusively rely on a central network node. That is, no single entity is the sole authority of the network. The decentral network 120 may comprise decentral node(s) and central network node(s). The decentral network 120 may comprise central network node(s) that may control and / or monitor the decentral network nodes 122.1-122.6. For example, the central network node(s) may provide authentication information, which may allow at least two decentral network nodes 122.1-122.6 to establish a peer-to-peer communication channel between respective decentral network nodes 122.1-122.6.A decentral participant node 122.1-122.6 may be, or comprise, a computing node. The computing node may be any device or system that comprises a physical and tangible processor, and a physical and tangible memory capable of having thereon computer-executable instructions that may be executed by the processor. Computing nodes are now increasingly taking a wide variety of forms. For example, computing nodes may be handheld devices, monitoring systems, control systems, laptop computers, desktop computers, mainframes and / or data centers. The memory may take any form, and depends on the nature and form of the computing node. The decentral participant nodes 122.1- 122.6 may be connected via a wired and / or wireless connection such as one of Ethernet, USB, LAN, WLAN and the like. Wireless communication may use, for example, WLAN, Wi Fi, cellular, and / or Bluetooth. The decentral participant nodes 122.1-122.6 may be configured to perform peer-to-peer data transactions, illustrated by arrows indicating the data flow 124.The decentral participant nodes 122.1-122.6 may be configured as data-consuming and / or data-providing network nodes. The decentral participant nodes 122.1-122.6 may be configured to provide data to other network node(s) of the decentral network 120 and / or to consume data from other network node(s) of the decentral network 120. For example, the decentral participant nodes 122.1-122.3 associated with the chemical producer e. g. 102.1, chemical user e. g. 102.2, or the end-product producer e. g. 102.3, respectively, may be configured to provide data related to the production of the respective components to downstream participants such as the waste collector I sorter, e. g. 102.5 or the recycling system operator 102.6. Further, the decentral participant network nodes 102.5, 102.6 associated with the waste collector I sorter e. g. 102.5 or recycling system operator e. g. 102.6, respectively, may be configured to access data from the decentral participant nodes 102.1-102.5 associated with upstream participants, such as the chemical producer e. g. 102.1 or end-product producer 102.3.The decentral participant node(s) 122.1-122.6 may comprise computer-executable instructions configured to provide, consume and / or process data, such as property data associated with the chemical product, intermediate product or end-product produced or processed within the circular material loop 100. The node(s) may run a data-providing service configured to provide data to another decentral participant node 122.1-122.6 of the decentral network 120. The decentral network node(s) 122.1-122.6 configured to provide data may be associated with a data owner or data- generating node associated with a material or product produced or processed within the circular material loop 100. The decentral participant node(s) 122.1-122.6 may be connected to dedicated data storage(s) storing the data associated with the material or product produced or processed in the circular material loop 100. The dedicated data storage(s) may be under control of the data owner or data-generating node associated with the material or product produced or processed in the circular material loop 100. The data owner may be the respective participant 102.1- 102-6, with which the data-generating node 122.1-122.6 is associated. The data generating node e. g. 122.1-122.6 may have access to the dedicated data storage(s). Thus, access to data associated with the material or product produced or processed within the circular material loop 100 may be under control of the data owner with which the respective decentral network node 122.1-122.6 is associated. This allows retaining full control over data associated with the material or product produced or processed within the circular material loop 100 by the data owner. At thesame time, this enables sharing of data associated with the material or product produced or processed within the circular material loop 100 under controlled conditions, for example by using appropriate protocols comprising authorization and authentication mechanisms or schemes to establish peer-to-peer communication.The decentral network participant 122.1-122.6 configured to consume data may comprise computer-executable instructions for accessing and / or processing data within the decentral network 120, such as data associated with the material produced or processed within the circular material loop 100 and provided by a node e. g. 122.1-122.6 providing the data. The node e. g. 122.1-122.6 consuming data may be controlled or owned by and / or associated with any upstream or downstream participant of the circular material loop 100. For example, the decentral participant node 122.4 may be associated with the participant 102.4 to allow access to property data associated with the supplied material through the decentral participant node 102.1 associated with the participant 102.1.The decentral network 120 may comprise further decentral network nodes. The further decentral network nodes may not be associated with further participants of the circular material loop 100. These further nodes may be decentral infrastructure service nodes (not shown). The decentral infrastructure service nodes may provide service(s) to the decentral participant nodes 122.1-122.6, such as verifying an identity of a decentral participant node 122.1-122.6 prior to performing an exchange of data. The decentral network participant node(s) 122.1-122.6 may be associated with or comprise certificate(s), such as X.509 certificate(s). The certificate(s) may be associated with an identity manager comprising, for example, a certificate issuing service and / or dynamic provisioning service providing dynamic attribute tokens such as OAuth Access Tokens, for example. This way, the decentral participant node(s) 122.1-122.6 may be associated or connected to a unique identifier embedded in a X.509 certificate that identifies the respective decentral participant node(s) 122.1-122.6. The information required to verify the certificate may be provided via an authentication registry associated with the certificate issuing service and / or a dynamic provisioning service. For example, according to the IDSA Reference Architecture Model, Version 3.0 of April 2019, a decentral data-providing network node associated with a data owner, Certification Authority (CA), Dynamic Attribute Provisioning Service (DAPS) and / or decentral data consuming network node associated with the data consumer may be used to verify the identity prior to performing the exchange of data (not shown).The material or product produced or processed by the participant(s) 102.1-102-6 may be associated with material data or product data associated with properties of the material or product. The material data or product data may be provided for access by the decentral participant node 122.1-122.6 associated with the participant 102.1-102-6. Access to the material data or product data may be controlled by the decentral participant node 122.1-122.6 providing the data. The material data or product data may be accessed by decentral participant node(s) 122.1-122.6 associated with further participants 102.1-102-6 and consuming the data, such as any upstream or downstream participant 102.1-102-6.The data flow 124 between decentral participant nodes 122.1-122.6 may be directly or indirectly associated with the loop material flow 114, for example 114.4 and 114.5, between the participants 102.1-102-6. For example, the data flow 124 may be directly associated with the loop material flow 114, if data associated with a chemical product provided from the chemical product producer to the chemical product user is accessed by a decentral participant node associated with the chemical product user and consuming the data. For example, the data flow 124 may be indirectly associated with the loop material flow 114 and / or raw material flow 116, if data associated with a chemical product produced by chemical product producer is accessed by the decentral participant node 122.6 associated with the recycling system operator 102.6 and consuming the data.Data transactions between decentral participant nodes 122.1-122.6 may be based on a decentral identifier associated with the material data or product data to be accessed. The decentral identifier may be associated with the physical entity of the material or product. The decentral identifier may be uniquely associated with the physical entity of the material or product. The decentral identifier may uniquely identify the material or product within the decentral network 120. The decentral identifier may be associated with further decentral identifier(s), such as decentral identifier(s) of material(s) and / or product(s) used to produce the end-product. This may allow tracking the material(s) and / or product(s) used to produce a product, such as an end-product. The decentral identifier may be comprised in a material access element associated with the material or product. The material access element may comprise a mark, machine-readable code, bar code, QR code, radio-frequency identification (RFID) device, near-field communication (NFC) device and / or internet-of-things (loT) device, for example.Thus, generation and use of access elements associated with data related to the production of the material (s), product(s), feedstock(s) and the like the decentral network allow monitoring of the loop material flow 114 at each stage of the production chain in the circular material loop 100.Fig. 2 illustrates an example of a sensor-based sorting system 200 for sorting textile waste including sensors 202, 212 and separation mechanisms 204 associated with the sensors 202, 212.The sorting system 200 may be any type of sorting system 200 suitable to sort textile waste 208. One example with a conveyer belt 206, a sensor system 202 and separation mechanism 204 is illustrated in Fig. 1. Other sorting systems may include density-based sorting processes such as centrifugal or float sink processes. The sorting systems in general may conduct any staged sorting.The conveyer belt 206 may carry the textile waste 208 to pass a first separator 204 that positions the textile waste pieces 208 on the conveyer belt 206 (not shown). The conveyer belt 206 may carry the individualizes pieces 208 to the first sensor system 202 such as a camera. The sensor system 202 may include one or more sensors configured to detect one or more properties of the textile waste pieces 208. The conveyer belt 206 may further carry the textile waste pieces 208 to pass a second separator 204 that separates the waste pieces 208 in different waste fractions21 Oa-d. The separation may be based on sensor data collected by the first sensor system 202. For example, a camera sensor and an associated processing unit may be configured to determine shape, color and / or size (not shown). Depending on the detected shape, color and / or size, the separator 204 may separate respective pieces 208 into different fractions 21 Oa-d.The conveyer belt 206 may carry the fractionized pieces 208 to the second sensor system 212 such as a spectrophotometric system, e.g. UV / VIS (ultraviolet / visible), NIR (near infra-red), or laser / optical sensor system. The second sensor system 212 may include one or more sensors configured to detect one or more properties of the textile waste pieces 208.The conveyer belt 206 may carry the textile waste to a second separator 204 that further separates the waste pieces 208 in different waste fractions 21 Oa-d. The separation may be based on sensor data collected by the second sensor system 212. For example, a NIR sensor and associated processing unit may be configured to determine material composition of the pieces 208 (not shown). Through multiple sensor systems 202, 212 and associated separators 204, the sorting depth can be increased to separate by piece shape, color, size and / or material composition.Fig. 3 illustrates an example of waste fraction separation by the sensor-based sorting system 200 with multiple sensor systems 202, 212. This is only an example based on the sorting system illustrated in Fig. 2. Other sorting mechanisms such as density-based mechanisms may include a similarly stage sorting process. The waste fractions resulting from such sorting may differ from the one illustrated as an example in Fig. 3.As shown in the example of Fig. 2, mixed textile waste may be sorted by way of the sensor-based 202, 212 sorting system 200. Fig. 3 illustrates the camera-based sorting into fractions such as light and heavy fraction. The heavy fraction may be further sorted by way of NIR-based sorting 212 into a waste fraction for incineration and pieces containing, for example but not limited to, polyamide (PA), polystyrene (PS), polypropylene (PP), high density polyethylene (HDPE), and polyethylene terephthalate (PET) may be separated. The PET fraction may be further separated through camera-based 202 sorting by color. Similarly, the light fraction may be further sorted (not shown).The multi-sensor systems, as for example illustrated in Fig. 2, required to reach the sorting depth for the waste fractions to be further processed are complicated, costly and are limited with regards to the quality of the waste fractions required for reuse. For example, in circular value chains mechanical recycling is a prominent reuse process. Such process, however, requires highly pure waste fractions that can be achieved in closed reuse circles. Even in such closed reuse circles, the number of times the material can be reused through mechanical recycling is limited. To overcome some of these challenges, solvent-based recycling is particularly advantageous.More enhanced textile waste sorting is thought to overcome such shortage and quality problems. Textile waste is, however, a challenging waste to be separated into fractions for reuse. For example, textile blends or multilayermaterials may be less suitable for some recycling processes than pure textile. Further for example, the fraction's composition may critically influence the quality and / or the yield of recyclate. Moreover, multi-material textile waste may comprise waste materials not suitable for separation, for example, by solvent-based recycling such as the case of cotton and / or some component such as dyes may not be possible to separate. Quality of the separated components may also depend on the wase fraction composition.Said differently, for textile waste such as packaging collected through mixed collection, sorting can be disrupted due to excessive contamination or additional sorting steps can be required, while the value of recyclate is automatically lowered and therefore the range of applications the recyclate could be used for is limited. Creating more intelligent sorting schemes to separate streams for mainstream textile types (PET, PA, cotton, wool, acrylic, rayon, linen, elastane) with fluctuating waste composition will lower contamination levels, increase the efficiency of sorting and increase the quantity and quality of recyclates.Fig. 4 illustrates an example of a chemical production network with multiple input material streams and multiple processes.The example of Fig. 4 illustrates a segregated chemical production network with multiple input material streams Input 1 -Input 4. The segregated chemical production network may comprise three processes: sorting, de-polymerization, and purification I polymerization, i. e. re-polymerization. Each of the three processes may comprise multiple process steps.The input material streams Input 1 -Input 4 may enter the chemical production network via the system boundary for sorting or recycling. The input material streams Input 1 -Input 4 may be routed to respective entries based on production attributes associated with the material input streams.The input material streams Input 1 -Input 4 may comprise waste material, such as recycling material and textile recycling material. The waste material may originate from at least one of a PI waste stream, a PC waste stream, and an EoL waste stream. The waste material may be sorted waste material or unsorted waste material. Each of the input material streams Input 1 -Input 4 may be associated with a corresponding supplier Supplier 1 -Supplier 4. The Supplier 1 -Supplier 4 may be different suppliers.For example, Input 1 and Input 2 may comprise mixed PET, and may thus enter the chemical production network for sorting. The input material streams Input 1 and Input 2 may be associated with production attributes relating a material type mixed PET, a product type EoL, and the supplier. The input material streams Input 1 and Input 2 may further be associated with production attributes relating a recycled input material type PI or PC, for example. Once sorting of Input 1 and / or Input 2 has been completed, the input material stream(s) may proceed to de-polymerization.Further, Input 3 and Input 4 may comprise sorted PET, and may thus enter the chemical production network for depolymerization. The input material streams Input 3 and Input 4 may be associated with production attributes relating a material type sorted PET, and the supplier. The input material streams Input 3 and Input 4 may further be associated with production attributes relating the recycled input material type PI or PC, for example. Input 3 and / or Input 4 may proceed to de-polymerization.The de-polymerization converts a polymer such as the PET in the input material streams into its building blocks. Purification may remove contaminations and / or constituents. Purification may be optional. Re-polymerization converts the building blocks back to a polymer. The recycled polymer may be the same polymer, i. e. rPET, or a different polymer. However, a constituent, such as cotton or elastane, may perturb the de-polymerization and subsequent re-polymerization.The chemical production network may produce two output materials Output 1 and Output 2. As the output materials have been produced from the waste material(s), Output 1 and Output 2 may have a lower PCF than materials produced from a non-recycled material, i. e. virgin material. Output 1 may be associated with Customer 1. Output 2 may be associated with Customer 2. The production properties associated with the input material streams Input 1- Input 4 may be allocated to the output materials Output 1 and Output 2 by way of material accounts as disclosed herein.Fig. 5 illustrates another example of a chemical production network with multiple input material streams and multiple processes.The other example of Fig. 5 illustrates a segregated chemical production network with multiple input material streams Input 1 -Input 4. The segregated chemical production network may comprise three processes: sorting, solvolysis, and separation I purification. Each of the three processes may comprise multiple process steps.The input material streams Input 1 -Input 4 may enter the chemical production network via the system boundary for sorting or recycling. The input material streams Input 1 -Input 4 may be routed to respective entries based on production attributes associated with the material input streams.The input material streams Input 1 -Input 4 may comprise waste material, such as recycling material and textile recycling material. The textile material may be fiber material. The waste material may originate from at least one of a PI waste stream, a PC waste stream, and an EoL waste stream. The waste material may be sorted waste material or unsorted waste material. Each of the input material streams Input 1 -Input 4 may be associated with a corresponding supplier Supplier 1 -Supplier 4. The Supplier 1 -Supplier 4 may be different suppliers.For example, Input 1 and Input 2 may comprise mixed PET, and may thus enter the chemical production network for sorting. The input material streams Input 1 and Input 2 may be associated with production attributes relating a material type mixed PET, a product type EoL, and the supplier. The input material streams Input 1 and Input 2 may further be associated with production attributes relating a recycled input material type PI or PC, for example. Once sorting of Input 1 and / or Input 2 has been completed, the input material stream(s) may proceed to de-polymerization.Further, Input 3 and Input 4 may comprise sorted PET, and may thus enter the chemical production network for solvolysis. The input material streams Input 3 and Input 4 may be associated with production attributes relating a material type sorted PET, and the supplier. The input material streams Input 3 and Input 4 may further be associated with production attributes relating the recycled input material type PI or PC, for example. Input 3 and / or Input 4 may proceed to solvolysis.The solvolysis dissolves a fiber material in the input material streams. The fiber material may comprise PET. The solvolysis may use a solvent comprising at least one of a solvent obtained from a biological source, gammavalerolactone, dimethylacetamide, dimethylformamide, dimethylsulfoxide, n-butylpyrrolidone, and n- methyl pyrrol idone, for example. Separation separates contents of the fiber material. The fiber material may be separated in a plurality of fraction, each of which comprising fibers of the same type, or fibers of similar types or compatible types. The solvent may be removed from the fiber material. Removing the solvent may use evaporation and I heat. Purification may remove contaminations and / or constituents. Purification may be optional. The recycled fiber material may comprise the same polymer, i. e. rPET. Compared to de-polymerization and subsequent repolymerization, a constituent, such as cotton or elastane, may have less effect on solvolysis.The chemical production network may produce two output materials Output 1 and Output 2. As the output materials have been produced from the waste material(s), Output 1 and Output 2 may have a lower PCF than materials produced from a non-recycled material, i. e. virgin material. Output 1 and Output 2 may also have a lower PCF than materials produced from a recycled material by de-polymerization and subsequent re-polymerization. Output 1 may be associated with Customer 1. Output 2 may be associated with Customer 2. The production properties associated with the input material streams Input 1 -Input 4 may be allocated to the output materials Output 1 and Output 2 by way of material accounts as disclosed herein.The examples of Figs. 4 and 5 are mere illustrative examples. Additional or alternative processes or production chains may be comprised in the chemical production network. Moreover, additional or alternative input material stream(s) such as a renewable input material stream or bio-based input material stream may enter the chemical production network. Additional or alternative production properties may be associated with the input material stream(s). Additional or alternative output material(s) may be produced.Figs. 6a, b illustrate example data structures for the intelligent sorting scheme using material composition and / or piece history data accessible by way of the decentral network 102.Fig. 6a illustrates the data structure based on the material composition data. The material composition data may be retrieved based on the decentral identifier from nodes 103 associated with participants 101 of the decentral network 102. The material passport may be retrieved from the node(s) 103 associated with participant(s) 101 of the decentral network 101 that own the respective data. For example, the waste piece data packages 1, 2 and 3 may be retrieved from the decentral network 102. The waste piece data packages 1, 2 and 3 may specify the material composition per waste piece. The pre-defined classification may be configured to sort PE containing pieces with a level of contaminants below a threshold value, e.g. contaminant mass fraction below 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2%, 1% or 0.5%, into one waste fraction. The pre-defined classification may be configured to sort PE containing pieces without contaminants such as nitrogen or chlorine, into a first waste fraction. The pre-defined classification may be configured to sort PET pieces into a second waste fraction. This way the quality of the sorted waste fraction can be in-creased with respect to the reuse of the waste fraction.Fig. 6b illustrates a data structure based on the piece history.The piece history data may be retrieved based on the decentral identifier from decentral network nodes 103 associated with participants 101 of the decentral network 102. The material passport may be retrieved from the node(s) 103 associated with participant(s) 101 of the decentral network 102 that own the respective data. For example, the piece data packages 1, 2 and 3 may be retrieved from the decentral network 102. The piece data packages 1, 2 and 3 may specify the material composition and the piece history per waste piece. The piece history may specify the use, application, and origin of the waste piece. In the example of Fig. 6b this may include the use in food industry, the manufacturer, the application in a closed loop PET bottle scheme and the loop count. The predefined classification may be configured to sort PE containing pieces by material composition as explained for example in the context of Fig. 6a. In addition, the waste pieces may be sorted by use. For example, food industry use may require the first waste fraction to be directed to a cleaning step for cleaning the pieces from biological residues. The pre-defined classification may be configured to sort PET containing pieces by material composition as explained for example in the context of Fig. 6a. In addition, the pre-defined classification may be configured to sort according to application PET bottles in the closed loop recycling scheme and the loop count. Closed loop PET bottles can be sorted to the waste fraction for mechanical recycling, if the loop count does not exceed a threshold value such as 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, or 15.For bottles exceeding the loop count threshold, the pre-defined classification may sort the PET bottles to the waste fraction for chemical recycling, since the material degradation requires chemical recycling to renew the loop count of the material. This way the waste pieces can be sorted with more depth in sorting allowing for tailored processing. The quality of the sorted waste fraction can be increased with respect to the reuse of the waste fraction.Fig. 7 illustrates an example of a method or apparatus for providing material composition and / or piece history data via a decentral network 102.The waste piece 900 as provided by the piece user or producer may be provided in association with a material passport. The piece passport may relate to a piece identifier. The piece identifier may include one or more decentral identifier(s). The decentral identifier may be an identifier in the decentral network 102 allowing for data exchange via the decentral network 102. Data exchange may include discovery of the decentral identifier for decentral network node(s) 103 associated with participant(s) 101 of the decentral network 102, authentication of decentral network node(s) 103 associated with participant(s) 101 of the decentral network 102 and / or authorization of data transfers via a peer-to-peer communication between decentral network node(s) 103 associated with participant(s) 101 of the decentral network 102.The piece passport may include or be related to data related to the piece such as piece property data associated with the piece properties like composition and / or piece history data. The piece passport may include a digital representation of the piece data associated with the piece 900. The piece passport may further include or relate to authentication and / or authorization information linked to the piece identifier. The authentication and / or authorization information may be provided for authentication and / or authorization of a data providing service and / or data consuming service implemented by decentral network node(s) 103.5, 103.3. The piece identifier may include or relate to a decentral identifier, that is uniquely associated with the piece. The decentral identifier may be connected to the digital representation of the of the piece data associated with the piece 104. The digital representation may include a representation for accessing the piece data or parts thereof. The decentral identifier may include a Universally Unique IDentifier (UUID) or a Digital IDentifier (DID). The decentral identifier may include any unique identifier uniquely associated with a data owner and / or piece.The data owner may be the producer of the piece. Via the decentral identifier and its unique association with the data owner and / or piece access to the piece data may be controlled by the data owner.The piece passport including the digital representation of piece data may be stored in a decentral data base 910. The piece data may be stored in a data base 902 associated with the data owner, such as the producer of the piece 900.The piece 904 may be physically delivered to the user using the piece and disposing the piece. The piece 900 may be physically collected and / or sorted by the piece collector and / or sorter. The piece may be connected with a QR- code having encoded the piece identifier. The user, collector or sorter of the piece 904 may read the QR-code through a QR-code reader 906. The piece identifier may be provided to a data base 910 associated with the producer producing the piece 900. In other embodiments the producer producing the piece 900 may retrieve the piece identifier through the decentral data base 910.The data owner in this example may be the piece producer, any intermediate product producer producing an intermediate product for the piece or any producer producing a product based on the piece. The data owner may comprise any entity generating data. The data generating node may be coupled to the data owner or the entity owning or producing physical products from or for which data is generated. The data may be generated by a third- party entity on behalf of the entity owning physical pieces from or for which data is generated.The data consuming service implemented by node 103.5 may comprise computer-executable instructions for accessing and / or processing data, such as piece data, associated with the data owner. The data providing service implemented by node 103.3 may comprise computer-executable instructions for providing and / or processing data, such as piece data, associated with the data owner for accessing and / or processing by the data consuming service implementing node 103.5.Based on the received piece identifier a request to access the piece data related to the piece identifier may be triggered by the data consuming service implemented by node 103.5 as signified by arrow 912. The piece identifier may be provided to the data providing service implemented by node 103.3 associated with or of the producer of the piece 900. In addition, authentication and / or authorization information may be provided.The request may be authenticated and / or authorized to access the piece data related to the piece identifier. Based on successful authorization and / or authentication access to the piece data related to the piece identifier may be granted.For access the piece identifier may be provided to the data providing service implemented by node 103.3 as signified by arrow 912. The data providing service implemented by node 103.3 may use the received piece identifier to retrieve the piece data associated with the piece 900 from a dedicated storage 902 as signified by arrows 918 and 920. The piece data associated with the piece 904 provided to the data providing service implemented by node 103.5 may be provided to the data consuming service implemented by node 103.5 as signified by arrow 916. The piece data associated with the piece 904 may be stored in the dedicated storage or data base 908 associated with the user, collector or sorter of the piece 904 as signified by arrow 922.Through the piece identifier or decentral identifier, the piece data can be uniquely associated with the piece 900, 904. Through the decentral network the piece data may be transferred between the producer of the piece and the user, collector or sorter of the piece. This way the piece data can be shared with unique association to the piece and without central intermediary directly between the players of the decentral network 102.This allows for controlled transparency of piece data across the material loop 100.Fig. 8 illustrates an example use of the pre-defined classification configured to separate textile pieces by recycling method.Material composition and / or the piece history data may be provided to the sorting system 400 via an interface 408 configured to retrieve data from node(s) 103 of a decentral network 102. The data may relate to material composition and / or piece history. The pre-defined classification may be configured to sort waste pieces according to the material composition and / or piece history into waste fraction(s). The gathered data per waste piece 404, 900, 904 may be aggregated to determine the material composition of the sorted waste fraction. The pre-defined classification may be configured to sort the waste pieces according to the material composition and / or piece history into waste fraction(s). The pre-defined classification may be additionally configured to assign the recycling process to the respective sorted waste fraction. Recycling processes may include mechanical, chemical and / or sol-vent-based recycling processes. The chemical recycling process types may include depolymerization, pyrolysis, gasification. The solvent-based recycling process type may include dissolution. The different recycling process types may be applicable to different fraction compositions. For example, PET that is not usable for mechanical recycling owing to degradation as e.g. specified by loop counts, may be assigned depolymerization as recycling process type. The depolymerization process may be further defined with regard to the depolymerization process type such as polycondensation via hydrolysis, glycolysis, methanolysis or transesterification. Further for example, fractions including mixed waste with limited oxygen content such as PE, PP, PS, may be assigned pyrolysis as recycling process type. The pyrolysis process may be further defined with regard to pyrolysis type based on operating conditions such as temperature, pressure, residence time, catalyst or thermal profiles. Further for example, fractions including mixed waste and biomass with oxygen content may be assigned gasification as recycling process type. The gasification process may be further defined with regard to gasification type based on operating conditions such as temperature. Further for example, fractions including contaminated waste of e.g. PP, PS, LDPE, PA or multi-layer films may be assigned dissolution as recycling process type. The dissolution process may be further defined with regard to dissolution type based on target polymer.As illustrated in Fig. 8 the sorted fractions IDs may be assigned to recycling process IDs. The pre-defined classification may be used for sorting by the sorter. The sorter may connect the identifier element 406 associated with the fraction ID to the fraction. The fraction ID may include or relate to the decentral identifier of the fraction. The fraction ID and associated fraction data may be provided for access by decentral network node(s) 103 of the decentral network 102 by the decentral network node 103.3 associated with the sorter 101.3 sorting the textile waste stream. The recycling process ID in association with the fraction ID may also be provided for access by decentral network node(s) 103 of the decentral network 102 by the decentral network node 103.3 associated with the sorter 101.3 sorting the textile waste stream. The fraction ID and recycling process ID may be accessed by the decentral network node 103.5 of the recycling system operator 101.5. The recycling system operator 103.5 may be based on the fraction ID retrieve the fraction data and / or recycling process ID from the decentral network node 103.4 associated with the recycling system operator. The recycling system operator 103.5 may store the fraction dataand / or recycling process ID in a dedicated storage associated with the recycling system operator 103.5. Based on the fraction ID, fraction data and the recycling process ID the recycling process may be operated by the recycling system operator. The fraction data may be used to aggregate recyclate data. Recyclate IDs may be assigned to the recyclate produced from respective fractions. This way not only the sorting process but also the recycling process may be monitored and / or controlled.The present disclosure has been described in conjunction with preferred embodiments and examples as well. However, other variations can be understood and effected by those persons skilled in the art and practicing the disclosure, from the studies of the drawings, this disclosure and the claims.Any steps presented herein can be performed in any order. The methods disclosed herein are not limited to a specific order of these steps. It is also not required that the different steps are performed at a certain place or in a certain computing node of a distributed system, i.e. each of the steps may be performed at different computing nodes using different equipment / data processing.As used herein ..determining" also includes ..initiating or causing to determine", "generating" also includes ..initiating and / or causing to generate" and "providing” also includes "initiating or causing to obtain, determine, generate, select, send and / or receive”. "Initiating or causing to perform an action” includes any processing signal that triggers a computing node or device to perform the respective action.In the claims as well as in the description the word "comprising” does not exclude other elements or steps and the indefinite piece "a” or "an” does not exclude a plurality. A single element or other unit may fulfill the functions of several entities or items recited in the claims. The mere fact that certain measures are recited in the mutual different dependent claims does not indicate that a combination of these measures cannot be used in an advantageous implementation.Any disclosure and embodiments described herein relate to the methods, the systems, devices, the computer program element lined out above and vice versa. Advantageously, the benefits provided by any of the embodiments and examples equally apply to all other embodiments and examples and vice versa.All terms and definitions used herein are understood broadly and have their general meaning.

Claims

64CLAIMS1 . A method for sorting a textile waste stream, in particular a mixed textile waste stream, to be processed by a solvent-based recycling process, wherein the textile waste stream includes one or more textile pieces containing textile material(s), the method comprising the steps of: providing textile piece identifier(s) associated with material composition and / or color of one or more textile waste fractions of the textile waste stream; generating - based on the provided textile piece identifier(s) - waste fraction control data configured to sort the one or more textile pieces based on the material composition and / or color of the one or more textile pieces, and providing the generated waste fraction control data to a sorting system configured to sort the textile waste stream; sorting the one or more textile pieces based on the provided waste fraction control data; providing the sorted one or more textile pieces - including sorted textile piece identifier(s) linked to sorted textile piece data associated with material composition and / or color of the sorted textile piece(s) - for separating the sorted one or more textile pieces into one or more chemical components; generating waste fraction data - including a component identifier - associated with chemical composition of the one or more chemical components, and providing the generated waste fraction data for access by one or more decentral network nodes associated with a chemical producer to further process the sorted one or more textile pieces.

2. The method of claim 1 , wherein further processing comprises separating the sorted one or more textile pieces into the one or more chemical components by the solvent-based recycling process, the one or more sorted textile pieces comprising a polymer blend, wherein the polymer blend comprises(i) a polyester and(ii) one or more component(s) selected from the group consisting of: a second polymer, a third polymer, a colorant, and an additive, wherein the one or more polymers are different from each other and different from the polyester of (i); the separating step comprising(a) providing the polymer blend and providing a solvent comprising gamma valerolactone;(b) contacting the polymer blend with the solvent comprising gamma valerolactone at a temperature T1 of < 170 °C, thereby obtaining a solvent comprising gamma valerolactone, which is enriched in dissolved optional second polymer, optional third polymer, in optional colorant and in optional additive or a part thereof; and a residue of the polymer blend, which is depleted of optional second polymer, of optional colorant and of optional additive or part thereof; and comprises the polyester, optionally the third polymer; and the optional additive or a part thereof; and / or65(c) contacting the polymer blend provided in step (a) or the residue of the polymer blend obtained in step (b) with a solvent comprising gamma valerolactone at a temperature T2 of > 170°C, thereby obtaining a solvent, which comprises gamma valerolactone and which is enriched in dissolved polyester compared to the solvent provided in step (a) and comprises optionally at least a part of the additive, and optionally a residue of the polymer blend, which is depleted of polyester and comprises optionally the third polymer and optionally the additive or a part thereof.

3. The method according to the preceding claim, wherein step (b) comprises:(b.1) contacting the polymer blend with the solvent comprising gamma valerolactone at a temperature T1 of < 140 °C, preferably of < 135°C, thereby obtaining a solvent comprising gamma valerolactone, which is enriched in dissolved optional second polymer, in optional colorant and optionally the additive or a part thereof; and a residue of the polymer blend, which is depleted of said optional second polymer, of said optional colorant and optionally of additive or part thereof; and comprises the polyester, optionally the third polymer; and the optional additive or a part thereof;(b.2) separating the solvent, which is enriched in dissolved optional second polymer, in optional colorant and optionally the additive or a part thereof, and the residue of the polymer blend, which is depleted of said optional second polymer, of said optional colorant and optionally of additive or part thereof; and comprises the polyester, optionally the third polymer; and the optional additive or a part thereof obtained in step (b.1 ), preferably by a physical separation method, thereby obtaining a separated sol-vent, which is enriched in dissolved optional second polymer, in optional colorant and optionally the additive or a part thereof compared to the solvent provided in step (a) and the residue of the polymer blend, which is depleted of said optional second polymer, of said optional colorant and optionally of additive or part thereof; and comprises the polyester, optionally the third polymer; and the optional additive or a part thereof.

4. The method of any of claim 2 or 3, preferably of claim 3, wherein step (b) further comprises:(b.3) washing the separated residue of the polymer blend obtained in step (b.2) at least once with a washing solvent comprising gamma valerolactone and optionally one or more solvent(s) selected from the group indicated above, thereby obtaining a washed residue;(b.4) optionally drying the washed residue obtained in step (b.3).

5. The method of any of claims 2 to 4, wherein the polymer blend comprises at least a third polymer, the method comprising d) separation of the solvent system, which is enriched in dissolved polyester obtained in step (c) from the residue obtained in step (c), thereby obtaining a solvent enriched in dissolved polyester, which is free of third polymer, and a residue comprising at least the third polymer, wherein the separation is done by66 heated solid-liquid separation, preferably at a temperature in the range of T ± 20°C, more preferably at a temperature in the range of T ± 10°C.

6. The method of any of claims 2 to 5 further comprising(e) optionally after heated solid-liquid separation according to d), cooling the solvent obtained in step (c) or in step (d), which is enriched in dissolved polyester compared to the solvent provided in step (a), to a temperature below T2 preferably below 150°C, more preferably below 140°C, more preferably below 120°C; thereby obtaining a precipitated polyester and a solvent, which is depleted in dissolved polyester; wherein cooling in step (e) is preferably done without addition of antisolvents; and / or, preferably and, comprising(f) separating the precipitated polyester obtained in step (e) from the solvent, which is depleted in dissolved polyester, thereby obtaining a precipitated polyester and the solvent, which is depleted in dissolved polyester; and / or, preferably and, comprising(g) optionally washing the precipitated polyester obtained in step (f);(h) drying the precipitated polyester obtained in step (f) or the washed precipitated polyester obtained in step (g).

7. The method of any of claims 2 to 6, wherein the solvent comprises gamma valerolactone and optionally one or more solvent(s) selected from the group consisting of water and organic solvents having a log KOW in the range of from -1 .6 to +1 .6, more preferably selected from the group consisting of water, C5 to C12 alkane, aliphatic C1 to C10 alcohol, C3 to C10 ketone, C2 to C10 cyclic ketone, HO-[C1 to C10 alkyl-O-]n-H, with n being an integer in the range of from 2 to 1000, C1 to C10 alkyl-O-C3 to C10 alkyl ether, C3 to C10 cyclic ether, optionally substituted with one or more C1 to C6 alkyl group(s), C6 to C10 aromatic hydrocarbon, optionally substituted with one or more C1 to C6 alkyl group(s), C2 to C10 aliphatic ester, C8 to C11 aromatic ester, C5 to C10 cy-clic carboxylic ester (lactone), C3 to C12 amide, preferably R1R2N-C(=O)-R3, wherein R1, R2 are independently a C1 to C4 alkyl group and R3 is selected from the group consisting of C1 to C9 alkyl group, C1 to C10 ester group and C1 to C6 ether group, C3 to C6 lactame, optionally substituted with one or more substituent selected from C1 to C6 alkyl group, C1 to C6 ester group and C1 to C6 ether group, and C5 imidazolidine, optionally substituted with one or more C1 to C6 alkyl group(s), C5 to C7 imidazolidone, optionally substituted with one or more C1 to C6 alkyl group(s), wherein preferably at least 1 weight-%, more preferably at least 5 weight-%, more preferably at least 10 weight-%, more preferably at least 20 weight-%, more preferably at least 30 weight-%, more preferably at least 40 weight-%, more preferably at least 50 weight-%, more preferably at least 60 weight-%, more preferably at least 70 weight-%, more preferably at least6780 weight-%, more preferably at least 90 weight-%, more preferably at least 95 weight-% of the solvent consists of gamma valerolactone, based on the total weight of the solvent being 100 weight-%.

8. The method according to any of claims 2 to 7, wherein the polyester is based on 1 ,4-butanediol or 1,2- ethandiol, more preferably the polyester according to (I) is selected from the group consisting of a polymer based on 1 ,4-butanediol and terephthalic acid (polybutylene terephthalate, PBT), a polymer based on 1,2- ethanediol and terephthalic acid (polyethylene terephthalate, PET), a co-polymer of 1 ,4-butanediol, adipic acid and terephthalic acid (polybutylenadipatterephthalat, PBAT), a polymer of 1 ,2-ethanediol and 2,5- furandicarboxylic acid (polyethylene furanoate, PEF) and mixtures of two or more of these (co)polymers, more preferably, the polyester comprises at least PET or PBT, more preferably the polyester is PET or PBT or a mixture of PET and PBT; and / or, preferably and, wherein the second polymer is selected from the group consisting of polyurethane (PU), polyethylene glycol (PEG), polytetrahydrofuran (pTHF), mixtures of these polymers and copolymers of these polymers; and / or, preferably and, wherein the third polymer is selected from the group consisting of polyolefins, preferably polyethylene (PE) and polypropylene (PP), polyamide (PA), natural polymer, preferably wool, cotton or viscose, mixtures of two or more of these polymers and copolymers of two or more of these polymers, wherein the third polymer is preferably selected from PA, wool, cotton, viscose and mixtures of two or more of these polymers; and / or, preferably and, wherein the colorant is selected from the group consisting of dye and optical brightener and mixtures of dye and optical brightener, and / or, preferably and, wherein the additive is selected from the group consisting of softener, water repellent, flame retardant, UV filter, plasticizer, filler and mixtures of two or more thereof.

9. The method according to any of the preceding claims, wherein waste fraction control data includes classification data including classification instructions associated with material composition data and / or textile piece history data associated with use, application and / or origin of the one or more textile pieces, wherein the classification instruction data is configured to classify the one or more textile pieces based on the material composition data per piece and / or textile piece history data per piece of the textile waste stream, optionally gathering decentral identifiers per textile waste fraction based on the material compositions data per piece and / or textile piece history data per piece, wherein the classification data is optionally provided by one or more decentral network nodes associated with one or more textile producers and / or one or more fiber producers using recycled textile waste-based product(s).

10. The method of any of the preceding claims, wherein the method comprises providing at least one of:68 a fraction data - including a fraction identifier - associated with fraction composition data and / or fraction history data linked to the fraction identifier, wherein the fraction identifier includes at least one decentral fraction identifier, wherein the decentral fraction identifier and a digital representation linked to the fraction data is provided for access by one or more network nodes of the decentral network, a recycling process data - including a recycling process identifier - associated with fraction composition data and / or fraction history data of waste fraction to be processed by the solvent-based recycling process linked to the recycling process identifier, wherein the recycling process includes at least one decentral recycling identifier, wherein the decentral recycling identifier and a digital representation linked to the recycling process data is provided for access by one or more network nodes associated with a recycler and / or the chemical producer further processing the waste fraction.

11. An apparatus for sorting a textile waste stream, in particular a mixed textile waste stream, to be processed by a solvent-based recycling process, wherein the textile waste stream includes one or more textile pieces containing textile material, the apparatus comprising: an identifier reader configured to detect at least one identifier element per piece from the textile waste stream, wherein the at least one identifier element is associated with at least one decentral textile identifier associated with the one or more textile pieces; a decentral network communication interface configured to provide the decentral textile identifier associated with the one or more textile pieces and to provide based on the decentral textile identifier material composition data and / or textile piece history data, wherein the material composition data and / or textile piece history data is provided based on the provided decentral identifier by one or more network nodes of a decentral network; a fractioning unit configured to fraction the one or more textile pieces based on the material composition data and / or piece history data into one or more textile waste fractions; a control signal generator configured to generate - based on the provided decentral textile identifier(s) - waste fraction control data configured to sort the one or more textile pieces based on the material composition and / or color of the one or more textile pieces; a control interface configured to provide the generated waste fraction control data to a sorting system configured to sort the textile waste stream.

12. A polyester obtained or obtainable by a solvent-based recycling process from a textile waste stream sorted according to the method of any of claims 1 to 10, or by the apparatus of claim 11 .

13. Use of the polyester of claim 12 for preparation of textile applications, fiber applications, packaging applications, plastic applications, automotive applications, electronic applications, preferably for the production of food packaging, beverage packaging, clothing, foot wear, wire, cable, wherein preferably in case that the polyester is selected from PBAT, PEF and PET, preferably PET, the polyester is used for textile applications,fiber applications, packaging applications, plastic applications, more preferably for the production of food packaging, beverage packaging, clothing and foot wear; wherein in case that the polyester is PBT, the polyester is used in textile applications, automotive applications, electronic applications, more preferably for the production of a wire and / or a cable.

14. Use of waste fraction control data generated according to the method of any of claims 1 to 10, or by the apparatus of claim 11, for sorting one or more textile waste streams, in particular one mixed textile waste stream, to be processed by a solvent-based recycling process.

15. A decentral data consuming network node or data consuming service configured to provide waste fraction control data, waste fraction data, composition data and / or piece history data according to the method of any of claims 1 to 10, or by the apparatus or claim 11, for sorting a textile waste stream, in particular mixed waste stream, to be processed by a solvent-based recycling process.

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