198results about "Hydrocarbon by depolymerisation" patented technology

The invention discloses a method for preparing a single-benzene-ring liquid chemical through solvent-free hydrogenation degradation of polystyrene waste plastics based on a bifunctional catalyst. According to the method, Nb2O5 is taken as a carrier, 1-3wt% of noble metal ruthenium is loaded to prepare a bifunctional catalyst, and high-molecular-weight polystyrene is efficiently degraded into single-benzene-ring liquid chemicals such as benzene, methylbenzene and ethylbenzene through hydrogenation reaction under a solvent-free condition. Precious metal ruthenium hydrogenates a polystyrene long chain to generate a short-chain hydrocarbon intermediate, then a carrier # imgabs0 # acid site drives beta-cracking and hydrogen transfer reaction, and a single-benzene-ring product is directionally generated through the synergistic effect of the short-chain hydrocarbon intermediate and the carrier # imgabs0 # acid site. The method has the advantages of no solvent, reduced equipment cost, high reaction efficiency, simple reaction operation, mild reaction conditions, simple catalyst preparation process, high activity, selectivity and good stability, and is suitable for industrial production, and no other solvents preempt acidic sites. The method not only can realize cyclic utilization of resources, but also can alleviate the current environmental pollution problem.

The invention discloses a platinum-tungsten bimetallic catalyst for PET depolymerization and a method for directional depolymerization of PET by the platinum-tungsten bimetallic catalyst, and belongs to the technical field of solid waste recycling, the platinum-tungsten bimetallic catalyst for PET depolymerization is prepared by a deposition-precipitation method, a mesoporous molecular sieve MCM-48 is used as a carrier to load platinum-tungsten bimetallic, the molar ratio of platinum to tungsten is 1: (0.5-2), the molecular sieve MCM-48 is a mesoporous molecular sieve MCM-48, and the mesoporous molecular sieve MCM-48 is a mesoporous molecular sieve MCM-48 carrier. And the platinum loading capacity is 4-6 wt%. By utilizing the platinum-tungsten bimetallic catalyst, one-pot depolymerization of PET can be realized to prepare p-toluic acid and p-xylene, the platinum-tungsten bimetallic catalyst can be used for multiple times through reduction regeneration, the catalytic activity is high, and the PET depolymerization method under catalysis of the platinum-tungsten bimetallic catalyst is suitable for recycling and upgrading of PET wastes in various forms and has wide application prospects. The technical problems of efficient depolymerization and directional conversion of the waste PET are solved, and a sustainable technical path is provided for resource recycling of the PET.

A method of converting a polymer including contacting a catalyst with a low-density polyethylene polymer to form a mixture and heating the mixture to a temperature of 200 degrees Celsius (° C.) to 600° C. in a microwave reactor to form a product. The catalyst includes an HZSM-5 zeolite, and 1 weight percent (wt. %) to 10 wt. % gallium and 0.1% to 5 wt. % copper, based on the total weight of the catalyst.

A photochemical process for converting plastics into hydrogen gas, gaseous C1-6 hydrocarbons, and hydrocarbons greater than 6 carbons using light absorbing metal-based catalysts on a solid support under ambient conditions is disclosed.

The invention provides a high-efficiency polypropylene conversion method based on catalysis-steam synergistic pyrolysis, which can realize high-selectivity preparation of low-carbon olefins, high-efficiency coke inhibition, wax removal and liquid-phase product control. The method specifically comprises the following steps: taking high-purity N2 as carrier gas, and simultaneously introducing a catalytic reaction system consisting of water vapor and an HZSM-5 molecular sieve catalyst, so that a polypropylene raw material is subjected to directional pyrolysis in an interval of 650-850 DEG C; according to the technical scheme, the intensity of the pyrolysis process is effectively reduced, and the reaction process is milder and more controllable. According to the method, the advantages of steam pyrolysis and catalytic cracking are coupled, the gas product yield (in terms of raw material mass) is 91%, the low-carbon olefin selectivity (the total proportion of C2-C4 olefins) is 78%, meanwhile, liquid products are remarkably reduced, and generation of coke and wax is inhibited. Compared with the prior art, through the synergistic effect of the steam and the catalyst, the utilization rate of carbon is increased, and olefin is enriched; and the key technical problems of coking, wax deposition, excessive liquid phase products and the like in the pyrolysis process are synchronously solved.

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 converting plastics includes a catalyst regenerator, a feeder containing a plastic feedstock, a first conical spouted bed reactor stage in fluid communication with the catalyst regenerator and in fluid communication with the feeder, and a second conical spouted bed reactor stage in fluid communication with the first conical spouted bed reactor stage.

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.

A distributed system for converting waste plastics, polymers, and other waste materials into useful chemical and fuel products (e.g., paraffins, olefins, and aromatics (e.g., BTX)) in a thermochemical process is described, where pretreatment involves raising the temperature of the waste plastics to at least 100°C. A two-step process for converting waste plastics, polymers, and other waste materials into useful chemical and fuel products (e.g., paraffins, olefins, and aromatics (e.g., BTX)) is described, which involves a first step of pyrolysis and a second step of catalytic fluidized bed upgrading of the resulting raw pyrolysis products without separation. In another embodiment, a method or system for upgrading waste plastics into useful products includes a first pyrolysis reactor and a catalytic fluidized bed reactor that together form one spoke of a "hub-and-spoke" network for producing generated chemical intermediates, where each of multiple plastic upgrading sites (spokes) produces a condensed phase product that is sent to a central processing facility (hub) for separation and purification into product streams, or for catalytic upgrading, separation, and purification into product streams.

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 invention relates to a process for depolymerizing a polystyrene filler comprising at least two pyrolysis sections, in which the hydrogen partial pressure and / or the residence time of the gas phase are controlled in the pyrolysis section of step d). Fig.2

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.

The invention relates to a synthesis method of 2, 5-norbornadiene and a cracking and addition reaction device of the 2, 5-norbornadiene, the device is characterized in that dicyclopentadiene is decomposed into cyclopentadiene at a high temperature, the cyclopentadiene is fully mixed in an acetone solvent and then fully contacted and reacted with diffused acetylene gas under the action of the addition reaction device, and the 2, 5-norbornadiene is obtained. Due to sufficient mixing and rapid reaction under a microscale, addition of dicyclopentadiene and cyclopentadiene, addition of dicyclopentadiene and acetylene and polymerization reaction of 2, 5-norbornadiene can be inhibited to a greater extent; unreacted cyclopentadiene is polymerized into dicyclopentadiene in a later process, so that recycling is facilitated; therefore, dangerous wastes are greatly reduced in the production process. A cracking device and an addition reaction device in the process are respectively formed by connecting four micro-channel assemblies and eight micro-channel assemblies in series. The method has the characteristics of high target product purity, high recovery rate, low reaction by-product content and the like.

To provide a method for decomposing a polyphenylene sulfide resin which can obtain a decomposition product from a polyphenylene sulfide resin with a high yield, and a method for producing benzine and bis(trialkylsilyl)sulfide.SOLUTION: A method for decomposing a polyphenylene sulfide resin includes a step of reacting a polyphenylene sulfide resin with a hydrosilane in the presence of a palladium complex catalyst having a ligand.SELECTED DRAWING: None

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 present invention discloses a platinum-tungsten bimetallic catalyst for PET depolymerization and a method for directional depolymerization of PET, belonging to the technical field of solid waste recycling. The platinum-tungsten bimetallic catalyst for PET depolymerization is prepared by a deposition-precipitation method, with a mesoporous molecular sieve MCM-48 as a carrier to load the platinum-tungsten bimetallic, the molar ratio of platinum to tungsten elements being 1:0.5-2, and the platinum loading being 4wt%-6wt%. The platinum-tungsten bimetallic catalyst can be used to achieve a one-pot depolymerization of PET to produce p-toluic acid and p-xylene, and the platinum-tungsten bimetallic catalyst can be used multiple times through reduction regeneration, having high catalytic activity. The PET depolymerization method catalyzed by the platinum-tungsten bimetallic catalyst is suitable for recycling and upgrading various forms of PET waste, solving the technical problems of efficient depolymerization and directional conversion of waste PET, and providing a sustainable technical path for the resource recovery of PET.

A method of producing olefinic and aromatic hydrocarbons from waste plastics comprising feeding a mixture of plastics along with the products of the oxidation of light hydrocarbons to a process in which the feed mixture is catalytically pyrolyzed to produce olefins and aromatics.

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.

A system can be used to generate styrene monomer product from feedstock originating from a pyrolysis operation and a dehydrogenation operation. The system can include a styrene processing subsystem and a distillation column. The styrene processing subsystem can be positioned to receive first feedstock and to generate the styrene monomer product. The styrene processing subsystem can include an initial distillation column. The distillation column can be coupled with the initial distillation column to provide at least a portion of the first feedstock. The distillation column can positioned to receive second feedstock that can include pyrolysis oil and to generate the portion of the first feedstock by separating styrene from the pyrolysis oil.

A supported catalyst for depolymerizing polymers and methods for making and using such catalyst. The supported catalyst comprises tungsten species supported on an alumina support, a molybdenum species supported on a smectite clay support, or a combination thereof. The supported catalyst is prepared by dissolving a tungstate salt or a molybdate salt in a solvent to form a first solution comprising cations and metal oxoanions, adding a Brønsted-Lowry acid to the first solution to form a second solution comprising a metal oxo acid, and contacting a support material with the second solution, wherein the support material is an alumina or a smectite clay, respectively. A mixture of a polyolefin-based feed stream and the supported catalyst can be added to a pyrolysis reaction zone under depolymerization conditions in the absence of oxygen to form a first vapor stream and first liquid stream comprising one or more olefin monomers.

The invention relates to the technical field of menadione intermediate 1 preparation, and discloses a menadione intermediate 1 preparation method, which comprises: 1, introducing dicyclopentadiene into a first continuous flow reactor, and carrying out a depolymerization reaction; step 2, synchronously introducing cyclopentadiene in the step 1 and a solution containing menadione and a Lewis acid catalyst into a second continuous flow reactor; step 3, introducing the reaction liquid in the step 2 and water into a third continuous flow reactor for continuous quenching and liquid separation, and separating an organic phase; 4, drying the organic phase, concentrating, pulping with methanol, and purifying to obtain the menadione intermediate 1; the continuous flow reactor is adopted to realize continuous quenching and continuous liquid separation, the operation risk is reduced while the operation is simplified, the production safety is improved, the Lewis acid is adopted as the catalyst, the reaction process is mild in condition, small in acid consumption, short in reaction time and small in corrosion to equipment, and the three-waste pollution is greatly reduced.

A method for processing a feedstock, the feedstock comprising halogenated polymer particles, the halogenated polymer particles having a polymer type with a first predetermined solubility parameter. The method includes pre-treating the feedstock by adding a solvent to the feedstock, the solvent having a second predetermined solubility parameter, the second predetermined solubility parameter substantially matching the first solubility parameter. After pre-treatment, the method further comprises irradiating the feedstock with microwaves using a microwave reactor.

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.