82results about "Hydrocarbon by depolymerisation" patented technology

Provided is a continuous process for converting waste plastic into recycle for polypropylene polymerization. The process comprises selecting waste plastics containing polyethylene and / or polypropylene and preparing a stable blend of petroleum and the selected plastic. The amount of plastic in the blend comprises no more than 20 wt. % of the blend. The blend is passed to a refinery hydrocracking unit. A liquid petroleum gas C3 olefin / paraffin mixture is recovered from the hydrocracking unit. The C3 paraffins and C3 olefins are separated into different fractions with the C3 olefin fraction passed to a propylene polymerization reactor, and the C3 paraffin fraction passed optionally to a dehydrogenation unit to produce additional propylene. A heavy fraction can also be recovered from the hydrocracking unit and passed to an isomerization dewaxing unit to prepare base oil.

A system for recovering styrene after depolymerization of styrenic waste plastics includes a depolymerization reactor unit capable of generating a pyrolysis oil stream and a residue stream from a wast

Aspects of the present disclosure generally relate to new processes for converting waste plastic. Aspects of the present disclosure also generally relate to new waste plastic conversion plants. In an aspect, a process for converting waste plastic is provided. The process includes heating a waste plastic feed with a dissolution medium to form a mixture comprising an insoluble component and a soluble component. The process further includes separating the soluble component of the mixture from the insoluble component of the mixture. The process further includes contacting the soluble component with a depolymerization catalyst to form a depolymerization product effluent. The process further includes separating a C12+ hydrocarbon from the depolymerization product effluent. The process further includes introducing the C12+ hydrocarbon to the dissolution unit.

This invention relates to the fields of catalyst preparation and polymer material recycling, and discloses a microporous-mesoporous dual-pore composite catalyst, its preparation method, and its application in the direct catalytic cracking reaction of waste plastics. The microporous-mesoporous dual-pore composite catalyst comprises ZRP-5 molecular sieve and HMS all-silica mesoporous molecular sieve. The pore size of the microporous-mesoporous dual-pore composite catalyst exhibits a bimodal distribution, with micropores having a diameter of 0.3-0.6 nm and mesopores having a diameter of 2-5 nm. Based on the total weight of the microporous-mesoporous dual-pore composite catalyst, the content of ZRP-5 molecular sieve is 20-50% by weight, and the content of HMS all-silica mesoporous molecular sieve is 50-80% by weight. Applying this microporous-mesoporous dual-pore composite catalyst to the direct catalytic cracking reaction of waste plastics to produce low-carbon olefins not only solves the problem of waste plastic recycling but also increases the production of important chemical raw materials such as low-carbon olefins.

Provided is a method for producing an olefin-containing composition, the method comprising a step of decomposing a plastic in the presence of a zeolite to produce an olefin-containing composition containing an olefin having 2 to 5 carbon atoms, and the zeolite is an MFI-type zeolite containing Rb +.

This reduces the possibility of solid material precipitation during the olefin manufacturing process. [Solution] A method for producing olefins using PET-containing plastic as a raw material, comprising a thermal decomposition step and a heat recovery step. In the heat recovery step, f(x) = -12.57 × (X1) 2 Heat recovery is performed at a temperature at least 5°C higher than the temperature f(x)[°C] derived from +1.941×(X2)+274.13, and at a temperature of 450°C or lower. X1 is the molar ratio [-] of the metal compound to the PET contained in the plastic, and X2 is the proportion [wt%] of PET in the plastic.

The application provides a catalyst, a preparation method thereof and application of the catalyst in catalyzing polystyrene pyrolysis. The catalyst comprises a molecular sieve and a transition metal element loaded in the molecular sieve; the molecular sieve is H-Beta molecular sieve and / or ZSM-5 molecular sieve; and the transition metal element is selected from one or more of Cu, Zn, Co and Ni, and the transition metal element exists in the form of metal element. The catalyst provided by the application can catalyze polystyrene pyrolysis under relatively mild conditions, and can efficiently and selectively convert polystyrene into styrene; the catalyst is easy to regenerate, has good cycle stability and is conducive to repeated use; and the catalyst has universality in recycling of commercial waste polystyrene plastic and polystyrene mixed plastic.

The invention discloses a method for preparing styrene by utilizing a solvent to synergistically catalyze and depolymerize waste polystyrene, and belongs to the technical field of waste plastic recycling. According to the method, a ZnAl2O4 spinel catalyst with rich surface defects is adopted to react for 10 minutes to 1 hour at the temperature of 200 to 450 DEG C in a specific low-concentration solvent system (1 to 10 weight percent), so that efficient depolymerization of polystyrene is realized. According to the method, the catalyst with a specific structure is combined with optimized solvent concentration and reaction time process parameters to achieve a synergistic effect, so that high conversion rate (gt, 98%) of polystyrene and high selectivity (gt, 75%) of styrene monomers are simultaneously realized under mild conditions, and an efficient solution is provided for high-valued closed-loop recovery of polystyrene.

Provided is a continuous process for converting waste plastic into recycle for polyethylene polymerization. The process comprises selecting waste plastics containing polyethylene and / or polypropylene and preparing a blend of petroleum and the selected plastic. The amount of plastic in the blend comprises no more than 20 wt. % of the blend. The blend is passed to a refinery hydrocracking unit. A liquid petroleum gas C3-C4 olefin / paraffin mixture, and optionally naphtha, is recovered from the hydrocracking unit and passed to a steam cracker to make ethylene A heavy fraction can also be recovered from the hydrocracking unit and passed to an isomerization dewaxing unit to prepare base oil.

The present disclosure relates to a process for converting unsaturated polyethylene into at least alkene products. The process includes contacting the unsaturated polyethylene with two or more catalyst components in a reactor containing an alkene reactant. The two or more catalyst components include a metathesis catalyst component and an isomerization catalyst component. By the contacting, at least a portion of the unsaturated polyethylene or a product derived therefrom undergoes a metathesis reaction and an isomerization reaction to produce an effluent containing at least alkene products.

Provided is a continuous process for converting waste plastic into recycle for polypropylene polymerization. The process comprises selecting waste plastics containing polyethylene and / or polypropylene and preparing a stable blend of petroleum and the selected plastic. The amount of plastic in the blend comprises no more than 20 wt. % of the blend. The blend is passed to a refinery FCC unit. A liquid petroleum gas C3 olefin / paraffin mixture is recovered from the FCC unit. The C3 paraffins and C3 olefins are separated into different fractions with the C3 olefin fraction passed to a propylene polymerization reactor, and the C3 paraffin fraction passed optionally to a dehydrogenation unit to produce additional propylene.

The invention discloses a preparation method of high-purity cyclopentene, and belongs to the technical field of organic synthesis. The method comprises the following steps: firstly, depolymerizing dicyclopentadiene into cyclopentadiene; mixing the obtained gaseous cyclopentadiene with hydrogen according to a ratio, sequentially passing through a first-stage fixed bed reactor and a second-stage fixed bed reactor which are connected in series, and carrying out selective hydrogenation reaction under the action of a supported palladium catalyst to generate crude cyclopentene; and finally, carrying out dimerization reaction on the crude cyclopentene in an inert atmosphere to remove residual cyclopentadiene, carrying out normal-pressure distillation purification, and collecting fractions at 43-47 DEG C to obtain high-purity cyclopentene. The two-stage fixed bed continuous hydrogenation process is adopted, the operation is simple, the reaction condition is mild, the cyclopentadiene conversion rate is high, the cyclopentene selectivity is good, the product purity can reach 99.6% or above, and the method is suitable for industrial continuous production.

Provided is a method for recovering cyclopentene, comprising allowing a metathesis catalyst to act on a ring-opened polymer having a structural unit derived from cyclopentene to recover cyclopentene.

A method and a process arrangement for producing hydrocarbons from plastic-based raw material by a gasification in an integrated process The integrated process includes a gasification unit for forming a gasification product, a steam cracking unit for forming a cracking product and a recovery unit for recovering hydrocarbons. The plastic-based raw material is gasified with steam in the gasification unit having at least one fluidized bed gasifier and the gasification product is formed, the gasification product is cooled at least partly for slowing and / or stopping the chemical reactions after the gasification, The gasification product is supplied to a quench tower of the gasification unit in which the gasification product is treated and condensable components are removed from the gasification product forming a treated gasification product, and the treated gasification product and the cracking product of the steam cracking unit are supplied to the recovery unit for separating and recovering hydrocarbons.

The application belongs to the field of chemical synthesis and relates to a method for realizing depolymerization of polystyrene catalyzed by decatungstate by using a light reaction technology.The method for realizing depolymerization of polystyrene catalyzed by decatungstate by using a light reaction technology comprises the following steps: mixing polystyrene substrates with a catalyst and a solvent, and then performing photodepolymerization under irradiation of a visible light source to obtain benzoic acid; wherein the catalyst is any one or a combination of tetrabutylammonium decatungstate, tetrabutylphosphonium decatungstate and tetrapotassium decatungstate.The method provided by the application has the advantages of mild reaction conditions, high catalytic efficiency of the catalyst, green and efficient reaction, strong product selectivity and easy scale-up synthesis, effectively solves the problems of high catalyst cost, harsh reaction conditions and messy products in traditional polymer depolymerization technology, and lays a foundation for polymer resource recycling and large-scale production of benzoic acid.

A method for producing an olefin-containing composition includes a step of decomposing plastic in the presence of a zeolite to produce an olefin-containing composition including an olefin with 2 to 5 carbon atoms, wherein the zeolite is at least one selected from the group consisting of a beta zeolite including Rb+ and a mordenite zeolite including Rb+.

Provided is a continuous process for converting waste plastics into recycling for polypropylene polymerization. This process includes a step of selecting waste plastics containing polyethylene and / or polypropylene, and a step of preparing a blend of the biofeedstock and the selected plastics. The amount of plastic in the blend constitutes 20 wt% or less of the blend. The blend is passed through an FCC unit. A liquefied petroleum gas LPG olefin / paraffin mixture and naphtha are recovered from the FCC unit and can be used in the production of polypropylene.

Disclosed are antioxidants used in compositions and methods to stabilize synthetic feedstock derived from plastic. Some methods disclosed herein include adding an antioxidant composition to a plastic-derived synthetic feedstock composition. Some methods disclosed herein include heating plastic under substantially oxygen free conditions at a temperature of from about 400° C. to about 800° C. to produce a pyrolysis effluent, distilling the pyrolysis effluent, recovering the synthetic feedstock, and adding a stabilizer to the synthetic feedstock to reduce contamination. The disclosure also provides compositions including a synthetic feedstock derived from plastic and an antioxidant.

The application discloses a catalyst for catalyzing polyethylene degradation to prepare ethylene and a preparation method thereof. x In y WO3 / CeO2 catalyst. The application highly disperses active metals in the carrier through simple impregnation, calcination and reduction steps, and the catalyst has the ability of dehydrogenation of noble metals and breaking of carbon-carbon bonds of WO3, realizes efficient conversion of polyethylene into ethylene at a lower temperature, and has a wide application prospect compared with other polyethylene ethylene systems.

The present disclosure relates to a process for converting olefins from waste plastic pyrolysis oil into at least alkene products. The process includes contacting waste plastic pyrolysis oil with two or more catalyst components in a reactor containing an alkene reactant. The two or more catalyst components include a metathesis catalyst component and an isomerization catalyst component. By the contacting, at least a part of the olefins or products derived therefrom in the waste plastic pyrolysis oil undergoes a metathesis reaction and an isomerization reaction to produce an effluent containing at least alkene products.

Described herein are methods of depolymerizing polyolefin-based materials into useful petrochemicals using styrene oligomers or polymers and heat. The styrene oligomers or polymers improve the depolymerization reaction by reducing the half-life of depolymerization, which results in a higher depolymerization rate and shorter residence time in the depolymerization unit, allowing for a predictable depolymerization reaction and reducing the formation of branches or aromatics in the product.

Reduces the possibility of solids depositing during the olefin production process. The method for producing olefins using PET-containing plastics as raw materials includes a thermal decomposition step and a heat recovery step. In the heat recovery step, f(x)=-12.57×(X1) 2 Heat recovery is carried out at a temperature at least 5°C higher than the temperature f(x) [°C] derived from +1.941 × (X2) + 274.13, but not higher than 450°C. X1 is the molar ratio [-] of the metal compound to the PET contained in the plastic, and X2 is the proportion [wt%] of PET in the plastic.

The present disclosure relates to a method for recovering styrene monomers from waste polystyrene, and more specifically, to a method for recovering styrene monomers from waste polystyrene, in which the waste polystyrene is depolymerized using an eco-friendly solvent and a potassium-containing carbonate depolymerization catalyst to suppress the generation of ethylbenzene, etc. generated as by-products in a styrene monomer recovery step, and thus the styrene monomers can be recovered in high yield.

A carbon treatment section is provided for handling carbon containing a liquid slurry, comprising a series of devices for the progressive depolymerization of the liquid slurry and the drying of the carbon, which is then collected and disposed of. This configuration of the process and apparatus for carbon removal treatment and disposal is highly flexible and allows for continuous operation without stopping the depolymerization reactor.

The invention provides a preparation method and an application scheme of a layered multifunctional solid catalyst Ru / Nb-MMT based on montmorillonite (MMT). The preparation method is characterized by comprising the following steps: fully mixing and stirring a niobium soluble solution and a carrier montmorillonite, and then roasting in a muffle furnace at the temperature of 400 DEG C or above for 4 hours to prepare a yNb-MMT carrier (y is the mass ratio of Nb); and finally, loading Ru onto the Nb-MMT by an impregnation method, and drying and reducing to obtain the xRu / yNb-MMT catalyst (wherein x is the mass ratio of Ru). The Ru / Nb-MMT catalyst prepared by the method can be used for catalyzing and hydrogenating complex components such as polyolefin, oxygen-containing plastic and chlorine-containing plastic by a one-pot method, and under the auxiliary action of auxiliaries such as calcium oxide and magnesium oxide, the yield of non-solid products can reach 80% or above. The catalyst is good in economy and convenient to prepare, has the advantages of high activity, high inactivation resistance and the like, is simple in reaction process, and has the prospect of large-scale conversion of mixed waste plastics.

The invention provides a production process and system of high-purity dicyclopentadiene, and the production process comprises the following steps: crude dicyclopentadiene and a solvent enter a cracking reactor, and liquid phase depolymerization is carried out in the cracking reactor to obtain a cracking product; the cracking product enters the refining tower from the middle lower part of the refining tower to be separated, and a stream containing cyclopentadiene is discharged from the top of the refining tower; wherein the reflux ratio of the refining tower is 0.1-1, and the temperature distribution of the rectifying section is lower than 60 DEG C; the stream containing cyclopentadiene enters a dimerization reactor, and dimerization is carried out in the dimerization reactor to generate a dimerization product; the dimerization product enters a dicyclopentadiene heavy component removal tower for heavy component removal, and a stream containing dicyclopentadiene is discharged from the top of the dicyclopentadiene heavy component removal tower; the stream containing dicyclopentadiene enters a dicyclopentadiene light component removal tower for light component removal, and high-purity dicyclopentadiene is obtained from the tower bottom of the dicyclopentadiene light component removal tower. According to the method, the purity and the yield of the dicyclopentadiene product can be improved, and meanwhile, the long-period stable operation of the system can be maintained.

The disclosure relates to a method for depolymerizing a substituted vinyl polymer, such as polystyrene. The method can form part of a chemical recycling process to depolymerize a vinyl polymer feed into desired monomers or oligomers, which can then be used to re-polymerize and re-form new polymer materials. The method includes heating a mixture of a vinyl polymer having a pendant aromatic or ester group and a metal or carbon-carbon network catalyst. The heating is performed at a temperature above a melting temperature of the vinyl polymer, but low enough such that the catalyst is in solid form in the mixture. The product resulting from depolymerization and heating can include one or both of a corresponding monomer product and a corresponding oligomer product from the original vinyl polymer.

The invention relates to a process for reprocessing composite plastic parts, for example molded parts made from curable casting compounds, such as sanitary basins, comprising at least one filler and at least one polymer, in particular polymethyl methacrylate, comprising the steps of: - comminution of at least one composite plastic part into a feed material, - feeding the feed material into a fluidized bed reactor with at least one fluidized bed component, - depolymerization of the at least one polymer of the feed material by means of pyrolysis to a pyrolysis product, in particular comprising methyl methacrylate, - separating the filler from the pyrolysis product, wherein the separated filler and the fluidized bed component are substantially similar, in particular identical, in material and / or size distribution, - discharge of a fluid stream comprising the pyrolysis product from the fluidized bed reactor.and - removal of at least a portion of the separated fill material together with at least a portion of the fluidized bed material from the fluidized bed reactor.

The present invention relates to a method for thermally decomposing a polycarbonate-containing material in order to recover raw materials. [Solution] A pyrolysis process comprising at least the following steps: (a) introducing a material to be pyrolyzed, including a mixture of PC and PS, into a reactor; (b) decomposing at least the material to be pyrolyzed at a temperature of 300°C to 700°C to obtain a gas-phase product as a pyrolysis product and a non-gas-phase pyrolysis residue, wherein (i) during the decomposition, the amount of oxygen gas in the reactor is 2.0 volume% or less of the total volume of gas present in the reactor; (ii) during the decomposition, the pyrolysis product is discharged from the reactor; and (iii) the pyrolysis residue is discharged from the reactor; and (c) the discharged pyrolysis product is cooled to a temperature of less than 300°C to obtain a pyrolysis product selected from pyrolysis product condensate, pyrolysis product resublimation, or a mixture thereof.

A mechanochemical method for recycling polystyrene. The method includes providing polystyrene, grinding the polystyrene to thereby obtain benzene, and wherein the step of grinding the polystyrene further comprises combining AlCl3 with the polystyrene during the grinding. The obtained benzene is then able to be recycled into styrene monomer. The obtained benzene is also able to be upcycled into benzophenone.