55 results about "Polymer waste" patented technology

The invention relates to a method for removing organic oligomers in a saturated ammonium sulfate liquid system discharged by an acrylonitrile ammonium sulfate device crystallizer, belongs to the field of chemical waste liquid resource recycling, and particularly relates to a method for removing organic oligomers in a saturated ammonium sulfate liquid system discharged by an acrylonitrile ammonium sulfate device crystallizer. The invention aims to solve the technical problem that the ammonium sulfate polymer waste liquid discharged by the crystallizer of the existing acrylonitrile ammonium sulfate device affects the stable operation of the incinerator of the environment-friendly device. After being treated by the method, the amount of the recyclable ammonium sulfate liquid is 80-90%, the amount of the separated oligomer liquid is 10-20%, the concentration of the oligomer in the separated oligomer liquid is 70-80%, and the amount of ammonium sulfate in the separated and incinerated oligomer liquid is only 1-4.5% of the amount of ammonium sulfate in the original incineration liquid, so that the influence of ammonium sulfate on an incinerator can be greatly relieved or eliminated; and long-term stable operation of the incinerator device is ensured.

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.

Disclosed are a process of recycling a polymer waste, a polymer polyol prepared from the process, and a polyurethane prepared from the polymer polyol and a polyisocyanate.

The invention discloses a hard carbon material, a preparation method and application thereof and a secondary battery. The preparation method comprises the following steps: mixing halogen-containing polymer powder and thermoplastic resin, heating and smelting, and cooling to obtain a mixture; mixing the mixture with a reducing metal, and carrying out heating dehalogenation at 100-400 DEG C for 2-12 hours under the protection of inert gas, so as to obtain a dehalogenation 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 alkali metal, the molar ratio of halogen atoms in the halogen-containing polymer powder to the reducing metal is 1: (1-3); when the reducing metal is alkaline earth metal, the molar ratio of halogen atoms in the halogen-containing polymer powder to the reducing metal is 1: (0.5-1.5). The preparation method can realize high value-added utilization while realizing pollution-free treatment of the halogen-containing polymer waste, and has the advantages of high efficiency, environmental protection, greenness, energy conservation and the like.

The application provides a polyacrylonitrile polymerization waste liquid recovery system and method, and belongs to the technical field of solvent recovery and purification. The system comprises, in sequence in the material flow direction, an AN single-removing unit, a first dehydration unit, a second dehydration unit, a third dehydration unit, a DMSO rectification and purification unit and an evaporation and concentration unit. The first dehydration unit is operated at normal pressure, and the operation pressures of the second dehydration unit, the third dehydration unit, the DMSO rectification and purification unit and the evaporation and concentration unit decrease in sequence. The DMSO decomposition rate can be reduced to 0.1%-0.5%, the desalted water consumption is reduced by more than 70%, and the wastewater discharge amount is reduced by more than 50%.

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.

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 respectively heat the first chamber (3) and the second chamber (4); a spray gun (5) having at least one discharge opening (6), where the spray gun (5) extends within the hollow chamber (2) at least through the first chamber (3), and where the system (1) is configured to feed polymer waste (7) into the second chamber (4) via the at least one discharge opening (6); at least one injector (21) capable of injecting at least one sweeping fluid into the first chamber (3), or into the first chamber (3) and the second chamber (4), to form a fluid flow towards at least one gas outlet (20) for collecting products (13) comprising the at least one sweeping fluid and gas (22) from the at least partially pyrolyzed polymer waste.

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 invention discloses an electronic carrier tape injection molding machining waste treatment device, and belongs to the field of polymer waste treatment. Comprising a cylinder; a shell is arranged outside the machine barrel; the driving mechanism is arranged in the machine barrel; the temperature control mechanism is arranged outside the machine barrel; the forming mechanism is arranged in the machine barrel; the controller is arranged on the shell and used for receiving a signal sent by the temperature control mechanism and completing regulation and control of the controller according to the received signal; and a man-machine interface is arranged on the top surface of the controller. The temperature control device has the beneficial effects that the liquid cooling plate of the temperature control mechanism is matched with the lifting rod, the temperature sensor monitors the temperature of different temperature control areas in the machine barrel, temperature information is transmitted to the controller, and the controller controls the distance between the liquid cooling plate and the machine barrel through the information transmitted by the temperature sensor; accurate control over the temperature of different temperature control areas is achieved, and different requirements of different machining stages for the temperature are met.

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 invention is based on a reactor (10a-d) for the continuous depolymerization of polymers, in particular polyolefins from polymer waste, comprising primary reactors (12a-d), heating units (14a, 14b, 14d) for heating and melting and at least partial depolymerization of the polymer in the primary reactors (12a-d), and at least one primary circulation unit (16a-d) for circulation of the molten polymer in the primary reactors (12a-d). The reactors (10a-d) comprise secondary reactors (18a, 18b, 18d) connected downstream of the primary reactors (12a-d) and forming a reactor cascade together with the primary reactors (12a-d).

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.