9results about "Hydrocarbon by polyarylsubstituted aliphatic compound split-off" patented technology

Disclosed are methods for upgrading heavy aromatic waste streams, including polystyrene and other related materials, to chemical feedstocks. Process embodiments include feeding heavy aromatic waste streams to: a) hydrogenation followed by steam cracking followed by separation; and b) separation followed by: i) hydrogenation, and ii) hydrogenation followed by steam cracking followed by and separation. Each embodiment leads to production of ethylene, propylene, ethylbenzene, ethylbenzene precursors, or a combination thereof.

Disclosed are methods for upgrading heavy aromatic waste streams, including polystyrene and other related materials, to chemical feedstocks. Process embodiments include feeding heavy aromatic waste streams to: a) hydrogenation followed by steam cracking followed by separation; and b) separation followed by: i) hydrogenation, and ii) hydrogenation followed by steam cracking followed by and separation. Each embodiment leads to production of ethylene, propylene, ethylbenzene, ethylbenzene precursors, or a combination thereof.

The application discloses a method for catalytic degradation of polystyrene. The method comprises the following steps: mixing polystyrene waste plastic, a catalyst and a solvent, and reacting in a closed container to obtain liquid-phase products containing aromatic compounds and gaseous products containing hydrocarbons; the catalyst is selected from at least one of alkali metal hydride, alkaline earth metal hydride or ternary hydride. The application provides a new way for catalytic cracking of high molecular carbon chains by using hydride as a catalyst. The pyrolysis efficiency of polystyrene reaches more than 90%, and the products are single-ring or double-ring benzene ring compounds. Unlike existing noble metal catalyst systems, the catalyst is alkali metal or alkaline earth metal hydride, and no noble metal needs to be loaded; the reaction process does not need high reaction temperature, the process is simple, the energy consumption is low, and large-scale production can be easily realized, thereby promoting the recycling of plastics.

The present application relates to the preparation technical field of heavy aromatic lightening catalyst, especially relates to a heavy aromatic lightening production polymethylbenzene catalyst and its preparation method and application. The catalyst takes HZSM-5 as a carrier, and loads bimetallic oxide La-X-MMO as an active component; wherein the metal X is one of Mg, Zn and Cu; the mass ratio of the metal La and the carrier is 5%-8%:1; the mass ratio of the metal X and the carrier is 0.4%-4%. The present application provides a catalyst with various non-noble metal oxides as active components, which has high catalytic activity and selectivity, the single-pass conversion rate reaches more than 80%, the light aromatic hydrocarbon (benzene, toluene, xylene) yield reaches more than 75%, and through the heavy aromatic lightening reaction evaluation, the catalyst provided by the present application still has good catalytic activity and selectivity after 300h of evaluation, and has long catalytic life.

The invention particularly relates to a method for preparing cumene, which comprises the following steps: carrying out catalytic cracking hydrogenation on heavy components generated in the process of preparing epoxypropane by adopting a cumene co-oxidation method in the presence of a supported catalyst to prepare the cumene, and remarkably improving the raw material conversion rate and the product yield while reducing the unit consumption of the cumene.

The application discloses a copper-loaded molecular sieve catalyst and a preparation method and application thereof, and comprises the following steps: S1, adding copper salt into deionized water, stirring to obtain solution A at a temperature of 25-90 DEG C; dispersing molecular sieve in deionized water to obtain suspension B; S2, adding solution A into suspension B, stirring at a temperature of 25-90 DEG C to obtain mixture C under reflux for 24-48 h; S3, centrifuging, washing and drying mixture C to obtain a catalyst precursor, and calcining the catalyst precursor to obtain the copper-loaded molecular sieve catalyst. The copper-loaded molecular sieve catalyst prepared by the application has high ethylbenzene selectivity and polystyrene conversion rate when being used for preparing ethylbenzene by catalytic cracking of polystyrene, the polystyrene conversion rate can reach 85%, the ethylbenzene selectivity can reach 60%, and the application value is high.

Aromatic compounds may be processed by a method that may include passing a hydrocarbon feed, hydrogen, and a recycle stream to a reactor and forming a reactor effluent. The recycle stream may include at least 90 wt.% of one or more C11+ aromatic compounds, wherein one or more of C11+ aromatic compounds are alkyl-bridged non-condensed alkyl multi-aromatic compounds. A portion of the alkyl-bridged non-condensed alkyl multi-aromatic compounds may be converted to mono-aromatic compounds in the reactor. The reactor effluent may be passed to a separation unit to form a first separated stream including at least 90 wt.% of one or more C6-C9 aromatic compounds, a second separated stream including at least 90 wt.% of one or more C11+ aromatic compounds, and a third separated stream including at least 90 wt.% of C10 aromatic compounds. The second separated stream may be split into a first portion and a second portion. The recycle stream may consist of the second portion of the second separated stream, and the second portion of the second separated stream may include from 5 wt.% to 95 wt.% of the second separated stream.

Aromatic compounds may be processed by a method that may include passing a hydrocarbon feed, hydrogen, and a recycle stream to a reactor and forming a reactor effluent. The recycle stream may include at least 90 wt. % of one or more C11+ aromatic compounds, wherein one or more of C11+ aromatic compounds are alkyl-bridged non-condensed alkyl multi-aromatic compounds. A portion of the alkyl-bridged non-condensed alkyl multi-aromatic compounds may be converted to mono-aromatic compounds in the reactor. The reactor effluent may be passed to a separation unit to form a first separated stream including at least 90 wt. % of one or more C6-C9 aromatic compounds, a second separated stream including at least 90 wt. % of one or more C11+ aromatic compounds, and a third separated stream including at least 90 wt. % of C10 aromatic compounds. The second separated stream may be split into a first portion and a second portion. The recycle stream may consist of the second portion of the second separated stream, and the second portion of the second separated stream may include from 5 wt. % to 95 wt. % of the second separated stream.

The invention discloses a method for preparing ethylbenzene through alcohol-mediated polystyrene catalytic hydrogenolysis and a catalyst thereof. Comprising the following steps: mixing a copper salt solution with an alkaline oxide dispersion liquid, dropwise adding an alkaline precipitator under a heating condition to adjust the pH value to 4-10, centrifuging, washing, drying and calcining to obtain the catalyst. The catalytic hydrogenolysis method comprises the following steps: adding polystyrene, a catalyst and alcohol into a reactor together, and reacting for 1-24 hours at 300-500 DEG C in an inert atmosphere to obtain ethylbenzene. The core of the method is that the alcohol is used as a reaction medium and an in-situ hydrogen source, the hydrogenolysis reaction of polystyrene is realized under the catalytic action, the dependence on high-risk and high-pressure externally supplied hydrogen in the traditional process is avoided, and the process safety is remarkably improved. And the preparation process is simple, low in cost and easy to recycle. By applying the method, the yield of light aromatic hydrocarbon can reach 70% or above, the yield of ethylbenzene can reach 42% or above, and a novel and efficient solution is provided for safe and high-valued recovery of polystyrene waste.