4results about "Hydrocarbon by polyarylsubstituted aliphatic compound split-off" patented technology

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 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.

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.