299results 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.

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 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.

Provided is a continuous process for converting waste plastics to recycle for polyethylene polymerization. The process includes the steps of selecting a waste plastic comprising polyethylene and / or polypropylene, and preparing a blend of petroleum and the selected plastic. The amount of plastic in the blend comprises less than 20 wt% of the blend. The blend is passed to a refinery / hydrocracking unit. Liquefied petroleum gas C 3 -C 4 The olefin / paraffin mixture, and optionally naphtha, is recovered from the hydrocracking unit and passed to a steam cracker for ethylene production. A heavy fraction is also recovered from the hydrocracking unit and may be passed to an isomerization dewaxing unit to prepare base oil.

Provided is a continuous process for converting waste plastics to recycle for polypropylene polymerization. The process includes the steps of selecting waste plastics comprising polyethylene and / or polypropylene, and preparing a stable blend of petroleum and the selected plastics. The amount of plastics in the blend constitutes less than 20 wt% of the blend. The blend is passed to a refinery-hydrocracking unit. A liquefied petroleum gas C3 olefin / paraffin mixture is recovered from the hydrocracking unit. The C3 paraffins and C3 olefins are separated into different fractions, the C3 olefin fraction is passed to a propylene polymerization reactor, and the C3 paraffin fraction is optionally passed to a dehydrogenation unit to produce additional propylene. A heavy fraction is also recovered from the hydrocracking unit and can be passed to an isomerization dewaxing unit to prepare base oil.

Disclosed is a method for producing an olefin-containing composition, the method being characterized by including a step for decomposing a plastic in the presence of zeolite so as to produce an olefin-containing composition that contains an olefin having 2 to 5 carbon atoms. This method for producing an olefin-containing composition is also characterized in that the zeolite is at least one selected from the group consisting of a beta type zeolite containing Rb+ and a mordenite type zeolite containing Rb+.

Provided is a continuous process for converting waste plastics to recycle for polyethylene polymerization. The process includes the steps of selecting waste plastics comprising polyethylene and / or polypropylene, and preparing a stable blend of petroleum and the selected plastic. The amount of plastic in the blend constitutes less than 20 wt% of the blend. The blend is passed to a refinery-crude unit. A liquefied petroleum gas C3-C4 olefin / paraffin mixture, and optionally a naphtha stream, are recovered from the crude unit and passed to a steam cracker for ethylene production. The product stream from the crude unit can also be passed to a hydrocracking unit, and the recovered heavy fraction can then be passed to an isomerization dewaxing unit to prepare base oil.

Provided is a continuous process for converting waste plastics to recycle for polyethylene polymerization. The process includes the steps of selecting waste plastics comprising polyethylene and / or polypropylene and preparing a stable blend of petroleum and the selected plastics. The amount of plastics in the blend constitutes less than 20 wt% of the blend. The blend is passed to a refinery FCC unit. Liquefied petroleum gas LPG olefin / paraffin mixture and naphtha are recovered from the FCC unit and passed to a steam cracker for ethylene production.

Provided is a continuous process for converting waste plastics to recycle for polypropylene polymerization. The process includes the steps of selecting a waste plastic comprising polyethylene and / or polypropylene, and preparing a stable blend of petroleum and the selected plastic. The amount of plastic in the blend comprises less than 20 wt% of the blend. The blend is passed to a refinery FCC unit. Liquefied petroleum gas C 3 The olefin / paraffin mixture is recovered from the FCC unit. 3 Paraffin and C 3 The olefins are separated into different fractions, 3 The olefin fraction is passed to a propylene polymerization reactor and 3 The paraffinic fraction is optionally passed to a dehydrogenation unit to produce additional propylene.

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.

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

Described herein is a method of depolymerizing plastic waste using a MOF catalyst. The process provides a high quality liquid depolymerization product at high efficiency that can be used as a cracker feedstock.

The invention discloses a method for degrading waste polypropylene through photo-thermal catalysis, which comprises the following steps: mixing waste polypropylene and a catalyst, putting into a photo-thermal reaction environment, and realizing directional decomposition of polypropylene into propylene and propane through photo-thermal catalysis under the protection of inert gas, the catalyst is SrTiO3 / LaFeO3, and the molar ratio of SrTiO3 The photo-thermal reaction environment is as follows: the light intensity in the reactor is 10-400 sunlight, the temperature is 100-500 DEG C, and the pressure is 0.1-1 MPa; according to the method, the waste polypropylene can be completely decomposed, the selectivity of propane and propylene in decomposition products can reach 60% or above, a photo-thermal catalytic reaction environment required by the reaction can be provided by a condensation technology or a high-power light source, and the catalyst is a composite metal oxide semiconductor catalyst with a special out-phase junction structure; sunlight is used as driving force, energy conservation and environmental protection are achieved, and the obtained product has high economic value and good practical application prospects.

Provided is a continuous process for converting waste plastics to recycle for polypropylene polymerization. The process includes the steps of selecting waste plastics comprising polyethylene and / or polypropylene, and preparing a stable blend of petroleum and the selected plastics. The amount of plastics in the blend constitutes less than 20 wt% of the blend. The blend is passed to a refinery-crude unit. A liquefied petroleum gas C3 olefin / paraffin mixture is recovered from the refinery-crude unit. The C3 paraffins and C3 olefins are separated into different fractions, the C3 olefin fraction is passed to a propylene polymerization reactor, and the C3 paraffin fraction is passed to a dehydrogenation unit to produce additional propylene. The product stream from the crude unit can also be passed to a hydrocracking unit, and the recovered heavy fraction can then be passed to an isomerization dewaxing unit to prepare base oil.

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 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.

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.

The invention relates to the technical field of pesticide production, in particular to a method and a device for continuously preparing octachlorocyclopentene, and the method at least comprises the following steps: by taking dicyclopentadiene and chlorine as raw materials, cracking dicyclopentadiene to obtain cyclopentadiene, gasifying the cyclopentadiene to obtain gasified cyclopentadiene, and separating the gasified cyclopentadiene from the chlorine to obtain the octachlorocyclopentadiene. According to the method, gasified cyclopentadiene reacts with chlorine in a reactor to prepare tetrachlorocyclopentane, tetrachlorocyclopentane is transferred to a chlorination kettle, chlorine continues to be introduced, and octachlorocyclopentene is prepared through staged cooling, the method does not need to add a diluent, operation is easy and convenient, side reactions are few, the yield is high, and meanwhile the continuous process can shorten the reaction time, improve the productivity and facilitate industrialization.

This invention relates to a polymer polyol comprising: (a) a dispersed phase formed by polymeric particles which are the polymerization product of a polystyrene pyrolysis oil, and acrylonitrile; or alternatively, of a polystyrene pyrolysis oil, acrylonitrile, and styrene monomer; and (b) a continuous phase comprising (b1) a polyol, to compositions comprising or made from the polymer polyol, such as polyurethane (foams). The invention also relates to a process for preparing polymer polyols using pyrolysis oil of polystyrene; as well as processes for the preparation of the compositions comprising or made from the polymer polyol.

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.

The invention 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 an H-Beta molecular sieve and / or a ZSM-5 molecular sieve; 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 a metal simple substance. The catalyst provided by the invention can catalyze polystyrene pyrolysis under a relatively mild condition, so that polystyrene is efficiently and highly selectively converted into styrene; the catalyst is easy to regenerate, has good cycle stability, and is beneficial to reutilization; and the method has universality in the recovery of commercial waste polystyrene plastic and polystyrene mixed plastic.

A preparation process of 5-ethylidene-2-norbornene, including: introducing dicyclopentadiene into a dicyclopentadiene decomposition reactor to thermally decompose the dicyclopentadiene; introducing a product of the above step into a cyclopentadiene purification tower; introducing 1,3-butadiene, a solvent, and cyclopentadiene separated from the top of the cyclopentadiene purification tower into a Diels-Alder reactor to react the same; introducing a product of the immediate above step into a 1,3-butadiene removal tower to recover 1,3-butadiene from the top; introducing a mixture at the bottom of the 1,3-butadiene removal tower into a desolvation tower, and recycling a solvent and unreacted raw materials recovered from the top of the desolvation tower to the dicyclopentadiene decomposition reactor; introducing a mixture at the bottom of the desolvation tower into a 5-vinyl-2-norbornene separation tower to separate 5-vinyl-2-norbornene; and introducing the 5-vinyl-2-norbornene into an isomerization reactor to react the same.

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