37 results about "Polymer waste" patented technology

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.

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 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 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.

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.

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).

The invention discloses a polymer waste liquid recovery system and purification process for polytetramethylene ether glycol, the polymer waste liquid recovery system comprises two groups of shells, the shells are connected with a treatment part, and the treatment part comprises: a feed pipe fixedly connected to the upper end of the side surface of the shell; the filter cartridge is fixedly connected to the inner side of the shell; and the guiding-out piece is installed on the shell and used for guiding out solid impurities in the filter cartridge, and the guiding-out piece comprises a guiding-out pipe fixedly connected to the bottom of the shell. According to the high polymer waste liquid recovery system for polytetramethylene ether glycol and the purification process, an eduction pipe, an adjusting column, an auger, a guide pipe, a cross shaft, a first hydraulic cylinder, a motor, a bevel gear assembly, a sleeve, a first butt joint shell, a branch pipe, a second butt joint shell, a discharging pipe, an air cylinder, a bearing barrel, a sliding rod and a filter element are matched with one another; and the solid impurities retained at the waste liquid solid filtering end are guided out.

Disclosed are a method for recycling polymer waste, a polymer polyol prepared by the method, and a polyurethane prepared from the polymer polyol and a polyisocyanate.

The present invention describes a process for producing nanostructured material, produced from polymer waste doped with alkaline metals and / or alkaline earth metals, which is capable of capturing and storing CO2. The process for obtaining the material uses waste generated by the polymer industry and is therefore environmentally sustainable. The product produced, that is, the nanostructured material, shows high CO2 absorption capacity, being able to absorb up to 80% by weight in mass in CO2. In addition, the product produced shows low density, an important characteristic for application in vehicles. Therefore, the product obtained can be used for capturing and storing CO2 emitted by different emission sources, mainly mobile sources such as vehicles, but can also be used in industries such as the mining industry, oil industry, inter alia, in addition to the automotive industry.

The invention provides a microwave-driven pyrolysis system and a microwave-driven pyrolysis method for preparing high-octane gasoline from waste polypropylene plastics, and belongs to the technical field of recycling of polymer wastes. The invention aims to solve the problems of complex product components and low resource utilization rate in traditional cracking. The left side of a microwave pyrolyzing furnace is connected with a nitrogen cylinder, the right side of the microwave pyrolyzing furnace is connected with a gas collecting cylinder through a condenser, and silicon carbide is placed in the microwave pyrolyzing furnace; the top of the microwave pyrolyzing furnace is provided with a feeder, the bottom is provided with a stirrer, and the side wall is provided with a magnetron and a thermocouple. According to the invention, silicon carbide (used as a wave absorbing agent) and waste polypropylene are uniformly mixed, so that microwave-driven overall heating is realized, microwave energy can be efficiently utilized, side reactions are inhibited, polypropylene cracking products are concentrated in a gasoline hydrocarbon range, high-octane gasoline can be directly generated, low-value components and coke are reduced, and the production cost is reduced. High-value products can be obtained without deep refining, and the accuracy and economical efficiency of resource conversion are remarkably improved.

Disclosed is a multi-stage continuous pyrolysis reactor using molten salt, and more specifically to a multi-stage continuous pyrolysis reactor that thermally decomposes polymer waste, such as waste plastics, under anaerobic or oxygen-deficient conditions. The multi-stage continuous pyrolysis reactor using molten salt according to the present invention comprises: a reactor body (100), a multi-stage pyrolysis furnace (200), a drive sprocket (330), a driven sprocket (340), a chain (350), a plurality of transport members (360), and a molten salt circulation unit (400).

The invention discloses a polymer composite modifier as well as a preparation method and application thereof, and relates to the field of asphalt preparation. Comprising the following components: polyethylene waste, polyurethane waste, waste SEBS, polystyrene waste, polyester waste, butyl rubber waste, butadiene styrene rubber waste, polyphthalamide and waste polystyrene. The preparation method comprises the following steps: uniformly stirring the components according to the ratio to obtain a preliminarily mixed material; the mixed material is crushed after being circularly ground for multiple times; and freezing the crushed material, and grinding to obtain the compound modifier. The polymer composite modifier is applied to preparation of asphalt for roads. According to the invention, the multi-source polymer waste with complex components is converted into a modifier product with uniform performance, high efficiency and high added value, and the modifier is applied to the preparation of the asphalt for the road, so that multiple targets of high performance, low cost, energy conservation, environmental protection and simplicity and convenience in operation are achieved.

The invention discloses an epoxy resin-based composite material based on a waste polyurethane foam degradation product and a preparation method of the epoxy resin-based composite material. The method comprises the following steps: (1) mixing waste polyurethane foam with ethanolamine under the protection of nitrogen, controlling the reaction temperature and time until the waste polyurethane foam is completely degraded, and performing reduced pressure distillation and purification to obtain a degradation product; and (2) carrying out ring-opening reaction on the degradation product and epoxy chloropropane under the action of a catalyst, then carrying out step-by-step alkali treatment to realize ring-closing epoxidation, and finally purifying to obtain the renewable epoxy resin, and (3) carrying out hot press molding on the bamboo fiber felt, waste polyurethane-based epoxy resin and a curing agent to obtain the bamboo fiber reinforced polyurethane-based resin composite material. According to the invention, high-valued utilization of waste polyurethane foam is realized, the obtained epoxy resin has the characteristic of environmental friendliness, the product has excellent comprehensive performance, and has equivalent mechanical properties with a commercial bisphenol A epoxy resin composite material, and a new thought is provided for recycling of polymer wastes.

In one embodiment, a method for processing polymeric waste materials into one or more products included: pyrolyzing a solid polymeric waste material, wherein the pyrolyzing includes: heating the solid polymeric waste material in the absence of oxygen to a temperature of 725 °F to 850 °F for a duration of 15 to 90 minutes; and thermochemically converting, in response to the heating step, at least some of the solid polymeric waste material into a first liquid product; separating the first liquid product from residual solids; separating a vapor stream from the vessel; and condensing at least a portion of the vapor stream into a second liquid product.