47 results about "Polymer waste" patented technology

The invention relates to the technical field of polymer waste treatment, and discloses a composite curing agent for curing chlorine and sulfur in polymer waste microwave thermal conversion and a preparation method and application thereof, and the method comprises the following steps: dissolving calcium nitrate and aluminum nitrate in deionized water to form an active component I solution; dissolving at least one of zinc nitrate, copper nitrate, ferric nitrate, manganese nitrate and cerium nitrate as an active component II in the active component I solution, adding citric acid into the formed mixed solution to form gel, and drying to obtain an active matter; and mixing the active matter, silicon carbide and bentonite, ball-milling, extruding and granulating, and calcining to obtain the composite curing agent. The composite curing agent disclosed by the invention can efficiently recover pyrolytic carbon, pyrolytic oil and pyrolytic gas while effectively and synergistically curing chlorine and sulfur pollution elements in situ; the curing rate of the chlorine / sulfur element can reach 80%, the recovery rate of the composite curing agent can reach 98%, and meanwhile, the raw material cost is low, and the problems of secondary pollution and equipment corrosion are avoided.

The invention relates to the technical field of polymer waste recycling, and discloses a device and method for preparing methyl methacrylate through continuous regeneration of waste acrylic, and the device comprises a two-stage reaction and feeding system, a molten salt online regeneration and energy management system, and a gas-phase product active purification and collection system. The method comprises the following steps: in the first-stage flash evaporation depolymerization cavity, the waste acrylic is in direct contact with high-temperature molten salt to realize rapid flash evaporation depolymerization; finishing the finishing reaction in a secondary molten salt cracking reactor and stripping the product through inert gas; the gas product is subjected to quenching separation and collection after being purified by high-temperature plasma; and the reacted molten salt is subjected to filtering purification, thermoelectric conversion energy recovery and reheating, and then is circulated back to the first-stage reaction cavity. According to the invention, the problems of low heat transfer efficiency, more side reactions, and difficulty in continuous and stable production due to easy inactivation of the medium in the traditional thermal cracking process are solved, the efficient and continuous production process is realized, and the yield and the product quality of methyl methacrylate are improved.

A process for recycling a stream of polyester waste material by depolymerising the polyester by alcoholysis, includes first and second consecutive stages of depolymerisation, in which the polymer waste material is subjected in a continuous manner, in the first stage, the polyester waste material is continuously fed to an extruder operated at a temperature above the polyester melting temperature, while a first amount of alcohol is co-fed to the extruder, to produce a fluid mixture including a melt of the at least partly depolymerised polyester, and in the second stage, the fluid mixture is continuously fed to a continuously stirred tank reactor (CSTR) operated at a temperature above the polyester melting temperature, while co-feeding a second amount of alcohol to the CSTR, a residence time in the CSTR being used to provide at the CSTR outlet a continuous stream of polyester depolymerised into an oligomeric ester.

The invention discloses a preparation method of regenerated ultra-low shrinkage black polyester staple fibers, and relates to the technical field of polymer waste recovery and regeneration, the preparation method comprises the steps of raw material mixing, drying treatment, spinning forming, post-treatment section, curling and cutting and finished product treatment, and when the shrinkage rate of the regenerated polyester staple fibers is controlled, the shrinkage rate of the regenerated polyester staple fibers is controlled by establishing a gradient temperature regulation and control program. Differentiated heat setting paths are set according to different regenerated raw material components, so that the accuracy of eliminating the internal stress of the fiber is ensured, the problem of abnormal shrinkage caused by local thermal stress concentration is avoided, the stability of the ultralow shrinkage performance of the fiber is ensured, and the size reliability of a product is improved; when fiber in-situ coloring and structure strengthening are carried out, synchronous achievement of color uniformity and ultra-low shrinkage characteristics is guaranteed by synchronously tracking the dispersion state of color master batches and crystallization dynamic evolution.

The present invention relates to a method for producing a hydrocarbon product from mixed polymer waste, preferably plastic waste and / or post consumer plastic waste, wherein said mixed polymer waste comprises 50-99.5 wt% polyolefins and 0.5-50 wt% compounds, preferably polymer, comprising heteroatoms, based on the total weight of the mixed polymer waste, comprising: (i) feeding said mixed polymer waste into an extruder; (ii) adding chemicals, preferably alkali metal salt and / or alkali earth metal salt, to said mixed polymer waste to degrade said compounds, preferably polymer, comprising heteroatoms; (iii) removing degradation products derived from said compounds, preferably polymer, comprising heteroatoms from said hydrocarbon product; and (iv) pyrolysing the hydrocarbon product in a fluidised bed reactor to obtain pyrolysis product.

Polymer waste is converted to graphite and graphitic porous carbons with the aid of solid additives. The air processing developed in this invention overcomes the oxygen diffusion bottlenecks for processing bulk polymer waste, achieving char yield over three orders of magnitude compared to without using solid additives. Thermally stabilized materials can be converted into highly crystalline flake graphite via low-temperature catalytic graphitization with a very high degree of graphitization. The plastics-derived graphite showed excellent electrochemical performance as anode material for lithium-ion battery anodes, capacitors, and supercapacitors. Graphite compositions are described.

A method of sequestering contaminant compounds from polymer waste can include thermally cracking at least a feedstock comprising polymer waste and a coker feedstock to produce at least coke and a coking effluent comprising hydrocarbons, where the polymer waste comprises chlorine and / or chloride compounds, wherein at least a portion of the chlorine and / or chloride compound is segregated into coke, and wherein the coke comprises 0.01 wt% to 1 wt% of the chlorine and / or chloride compound; and separating at least a portion of the coker effluent to form coker naphtha.

Polymer waste is converted to graphite and graphitic porous carbons with the aid of solid additives. The air processing developed in this invention overcomes the oxygen diffusion bottlenecks for processing bulk polymer waste, achieving char yield over three orders of magnitude compared to without using solid additives. Thermally stabilized materials can be converted into highly crystalline flake graphite via low-temperature catalytic graphitization with a very high degree of graphitization. The plastics-derived graphite showed excellent electrochemical performance as anode material for lithium-ion battery anodes, capacitors, and supercapacitors. Graphite compositions are described.

The present disclosure relates to methods of separating flame retardants from styrene polymers in styrene polymer waste. The method comprises combining the styrene polymer waste with a solvent to obtain a soluble fraction and an insoluble fraction, separating the soluble and insoluble fractions, and the flame retardant is substantially in the soluble fraction and the styrene polymer is substantially in the insoluble fraction or vice versa.

The present invention relates to a method for producing a hydrocarbon product from mixed polymer waste, preferably plastic waste and / or post consumer plastic waste, wherein said mixed polymer waste comprises 50-99.5 wt % polyolefins and 0.5-50 wt % polymer comprising heteroatoms, based on the total weight of the mixed polymer waste, comprising: (i) feeding said mixed polymer waste into an extruder, preferably a single screw extruder; (ii) adding chemicals, preferably alkali metal salt and / or alkali earth metal salt, to said mixed polymer waste to degrade said polymer comprising heteroatoms; (iii) removing degradation products derived from said polymer comprising heteroatoms from said hydrocarbon product; and (iv) collecting the hydrocarbon product. The method and system of the present invention may be used as a pre-treatment in recycling mixed polymer waste to produce a hydrocarbon product ideally suited for pyrolysis.

The present disclosure relates to methods of recovering flame retardant from a styrenic polymer waste.

Polymer waste is converted to graphite and graphitic porous carbons with the aid of solid additives. The air processing developed in this invention overcomes the oxygen diffusion bottlenecks for processing bulk polymer waste, achieving char yield over three orders of magnitude compared to without using solid additives. Thermally stabilized materials can be converted into highly crystalline flake graphite via low-temperature catalytic graphitization with a very high degree of graphitization. The plastics-derived graphite showed excellent electrochemical performance as anode material for lithium-ion battery anodes, capacitors, and supercapacitors. Graphite compositions are described.

The present invention relates to a method suitable for recycling mixed polymer waste material, wherein the waste material comprises polyurethane (PUR) elements and dye-containing polyester elements mechanically bonded to these polyurethane elements, and the method comprises a series of steps including: dispersing the mixed polymer waste material in 2-(2-ethoxyethoxy)ethanol (DGME); leaving the polymer waste material dispersed in the DGME until at least a portion of the dye is extracted from the polyester into the DGME and at least 90% (w / w) of the PUR elements are dissolved in the DGME; separating the polyester elements from the DGME containing at least a portion of the dye and dissolved PUR elements; and reusing the polyester to manufacture a new product.

The present invention relates to a method for recovering and recycling disperse dyes from colored polymer wastes having an ester functional group and, more specifically, to a method for recovering and recycling disperse dyes from colored polymer wastes having an ester functional group, wherein the disperse dyes are extracted by color from the polymer wastes having an ester functional group by using a first compound, and the disperse dyes extracted by color are colored on polymer fabrics having an ester functional group.

A polymer modification method comprises: (a) contacting a polymer with at least one carboxylic acid selected from C2-C40 aliphatic, aromatic, or cyclic acids; (b) introducing free radicals via thermal, photochemical, or chemical decomposition; (c) adding at least one nitrogen compound; and (d) optionally incorporating a metallocene catalyst. The method enhances polymer properties (tensile strength, elongation, impact resistance) by 25-250%, reduces energy consumption 20-45% compared to virgin production, and enables processing of mixed polymer wastes. Applications include automotive components (20-40% recycled content), food-grade packaging (up to 35% recycled HOPE), construction materials, and waste valorization. The predictive radical chemistry enables controlled property enhancement through mathematical correlation between radical concentration, reaction kinetics, and polymer modification degree.

According to an example aspect of the present invention, there is provided a system (1) comprising a hollow chamber (2) comprising a first chamber (3) and a second chamber (4), wherein the second chamber (4) is rotatable or the first chamber (3) and the second chamber (4) are rotatable, a heating system (19) configured to heat the second chamber (4) or to individually heat the first chamber (3) and the second chamber (4), a lance (5) having at least one feed outlet (6), wherein the lance (5) extends within the hollow chamber (2) at least through the first chamber (3), and wherein the system (1) is configured to feed polymer waste (7) into the second chamber (4) via the at least one feed outlet (6), at least one injector (21) capable of injecting at least one sweep fluid into the first chamber (3) or into the first chamber (3) and into the second chamber (4) in order to form a fluid flow towards at least one gas outlet (20) for collecting a product (13) comprising the at least one sweep fluid and a gas (22) from at least partially pyrolyzed polymer waste.

A recycling composition comprising a polymer waste stream having an amount of low molecular weight polyolefin ranging from about 10 weight percent (wt.%) to about100 wt.% based on the total amount of polymer in the polymer waste stream, wherein the low molecular weight polyolefin has a number average molecular weight (Mn) of less than 10,000 g / mol. A method comprising contacting a polymer waste stream having an amount of low molecular weight polyolefin ranging from about 10 weight percent (wt.%) to about100 wt.% based on the total amount of polymer in the polymer waste stream with a chain scission agent to form a reacted mixture; and conducting advanced recycling with the reacted mixture wherein the low molecular weight polyolefin has number average molecular weight (Mn) of less than 10,000 g / mol.

The present invention discloses a hard carbon material and its preparation method, application and secondary battery. The preparation method comprises: mixing a halogen-containing polymer powder and a thermoplastic resin, heating and smelting the mixture, and cooling the mixture to obtain a mixture; then mixing the mixture with a reducing metal, heating and dehalogenating the mixture at 100-400°C under inert gas protection for 2-12 hours to obtain a dehalogenated sample; washing, drying and carbonizing the dehalogenated sample to obtain a hard carbon material; the thermoplastic resin is polypropylene and / or polyethylene; when the reducing metal is an alkali metal, the molar ratio of the halogen atoms in the halogen-containing polymer powder to the reducing metal is 1:(1-3); when the reducing metal is an alkaline earth metal, the molar ratio of the halogen atoms in the halogen-containing polymer powder to the reducing metal is 1:(0.5-1.5). The preparation method can achieve pollution-free treatment of halogen-containing polymer waste while achieving high value-added utilization, with the advantages of high efficiency, environmental protection, greenness and energy saving.

The invention discloses composite carbon source porous carbon, a silicon-carbon composite material, a preparation method and application of the silicon-carbon composite material and a battery. The preparation method of the composite carbon source porous carbon comprises the following steps: heating a mixed solution of vinasse and an acid solution to obtain pretreated vinasse; carrying out heating treatment on the mixed solution of the pretreated vinasse and the alkali solution to obtain alkali-treated vinasse; and reacting a mixed solution containing the alkali-treated vinasse, PVC and alkaline earth metal powder at room temperature, and sequentially washing, granulating, pre-carbonizing and carbonizing to obtain the composite carbon source porous carbon. The preparation method disclosed by the invention can realize pollution-free treatment and high-added-value utilization of the halogen-containing polymer waste and the distillers' grains, and has the advantages of high efficiency, environmental protection, greenness, energy conservation and the like; the prepared composite carbon source porous carbon has high conductivity and high porosity, and also has excellent electrochemical performance when being applied to batteries.

The following generally relates to recycling polymer waste materials, and more particularly to selecting a solvent, or solvent mixture, to be used to separate polymers from a polymer waste material as pail of a recycling process. For example, if a polymer waste material including multiple individual polymers is not first separated into individual polymers, the recycling process may not produce a useful product. In some embodiments, one or more processors determine a solvent composition and temperature to use the solvent composition at to separate individual polymers out of the polymer waste material.

The present invention provides a combined recovery and treatment method for polymerization waste liquid and kettle washing waste liquid generated by a PAN-CF polymerization test, comprising the following steps: mixing the polymerization waste liquid and kettle washing waste liquid to obtain a mixed waste liquid; mixing the mixed waste liquid and a first emulsifier solution to obtain a mixed emulsion; separating and treating the mixed emulsion to obtain a target component and a second emulsifier solution, wherein the target component includes reactants and products of the polymerization test; and adding the obtained second emulsifier solution to the first emulsifier solution. In addition, the method also obtains a kettle washing solvent. The combined recovery and treatment method avoids gel or coking caused by directly heating and distilling or rectifying the high-viscosity polymerization waste liquid, and at the same time, the emulsifier is designed to be repeatedly recycled, thereby achieving efficient utilization of resources as a whole, and providing a strategy for reducing the production cost of polyacrylonitrile-based carbon fibers to further promote their market applications.

A plant for production of a mixture of waste based on polyolefins and XPS suitable for feeding into a pyrolytic reactor. The plant includes: a feeding station that releases a flow of material to be treated; a first station for removing the metal fragments; at least one optical separator for removing the non-polyolefin polymers and the textile and cellulosic fractions; a screen for removing the foreign bodies with dimensions smaller than a predefined minimum; a shredder for reducing the particle size of the material to be treated; a second station for removing the metal fragments; and an aeraulic separator for separating the three-dimensional polyolefin fraction from the two-dimensional polyolefin fraction. The embodiments also concern a method for the production of a mixture of waste based on polyolefin and XPS, suitable for chemical recycling.

A pyrolysis method and a pyrolysis reactor for thermal decomposition of polymer waste materials, particularly rubber and plastics waste materials, using a fast pyrolysis process, are disclosed. The waste material is delivered to a pyrolytic chamber, and is heated to a decomposition temperature of the waste material by microwave radiation.

The present invention pertains to a process to enable the recycling of a stream of polyester waste material by depolymerising the polyester by alcoholysis, the process comprising at least a first stage of depolymerisation and a separate second consecutive stage of depolymerisation, to which first and second stages the stream of polymer waste material is subjected in a continuous manner, wherein in the first stage of the two consecutive stages, the stream of polyester waste material is continuously fed to an extruder operated at a temperature above the melting temperature of the polyester, while a first amount of alcohol is co-fed to the extruder, in order to produce a fluid mixture comprising a melt of the at least partly depolymerised polyester, and wherein in the second stage, the said fluid mixture is continuously fed to a continuously stirred tank reactor (CSTR) operated at a temperature above the melting temperature of the polyester, while co-feeding a second amount of alcohol to the CSTR, wherein a residence time in the CSTR is used to provide at the outlet of the CSTR a continuous stream of polyester depolymerised into an oligomeric ester. The invention also pertains to a system for applying this method.

A method of making a core-shell ion-exchange resin that includes: dissolving a first polymer waste to form a core polymer solution; dissolving a second polymer waste to form a shell polymer solution immiscible with the core polymer solution; feeding the core polymer solution into an internal nozzle inside an external nozzle; feeding the shell polymer solution into the external nozzle, to a gap between the internal nozzle and the external nozzle; ejecting the core polymer solution from the internal nozzle, forming a laminar flow including the two polymer solutions; vibrating the external nozzle; ejecting the laminar flow from the external nozzle, the vibrating breaking the laminar flow and forming a droplet having a core including the core polymer solution and a shell including the shell polymer solution; and forming, from the droplet, a core-shell ion-exchange resin with a shell including functional groups capable of ion exchange in a solution.

Disclosed herein are laminate compositions comprising a plurality of fibres, triboelectric generators comprising generators comprising said laminate compositions, substrates and articles comprising said laminate compositions or triboelectric generators. Also disclosed herein are methods of manufacturing the laminate compositions, and uses thereof for electricity generation.

The present invention relates to a process suitable for recovering mixed polymer waste comprising a polyurethane (PUR) article, and a dye-containing polyester article mechanically attached to said polyurethane article, the process comprising the following consecutive steps: dispersing the mixed polymer waste in 2-(2-ethoxyethoxy) ethanol (DGME), the method comprises the steps of providing a DGME containing a dye and a PUR article, then allowing the polymer waste to remain dispersed in the DGME until at least a portion of the dye is extracted from the polyester into the DGME and at least 90% (w / w) of the PUR article is dissolved in the DGME, separating the polyester article from the DGME containing the at least a portion of the dye and the dissolved PUR article, and finally reusing the polyester to produce a new product.

A method for producing hydrocarbons from polymer waste includes: A) heating pre-crushed polymer waste in the presence of a mixture of liquid hydrocarbons to a temperature sufficient to convert at least one target polymer from the polymer waste to solution, but a lower transition temperature to solution for the remaining components of the polymer waste, to produce a polymer-containing mixture including a solution of at least one target polymer in the liquid hydrocarbon mixture, and B) catalytic cracking of the polymer-containing mixture in the presence of an ultrafine catalyst at a temperature from at least 360° C. to produce a mixture of liquid and gaseous hydrocarbons.

A self-contained recycling and additive manufacturing apparatus that transforms discarded polymeric waste into new three-dimensional (3D) printed objects. The apparatus includes a housing containing a waste intake and sorting assembly with a receptacle bin, shredder, and separator for preprocessing recyclable materials. A grinding and melting subsystem mechanically reduces and thermally melts the sorted waste, and an extruder converts the molten polymer into continuous filament for 3D printing. A digital control interface featuring a display panel, selectable 3D model options, and status indicator lights enables intuitive operation and real-time monitoring. A printing chamber enclosed by a transparent pivotable lid houses a movable build platform and print head assembly for layer-by-layer fabrication. The system is powered by a rechargeable battery, enabling portable and off-grid operation.

A process for improving a polymer waste-based material is provided. The process includes providing a polymer waste-based feedstock, providing a feedstock obtained from crude oil, mixing the polymer waste-based feedstock, the feedstock obtained from crude oil, and optionally additional feed material to provide a feed mixture, hydroprocessing the feed mixture in an FCC feed hydrotreater to provide a hydrocarbon-containing material, and recovering at least a distillate product and a distillation bottoms product from the hydrocarbon-containing material (step E).