Process method for preparing p-methylstyrene through reaction of p-methyl-ethylbenzene

Abstract

The invention discloses a process method for preparing p-methyl styrene through reaction of p-methyl-ethylbenzene, which relates to the technical field of preparation of p-methyl styrene and mainly comprises the following steps: heating and gasifying raw materials, carrying out two-step reaction, recycling steam condensate, recycling light and heavy aromatics, extracting p-methyl styrene, recycling dehydrogenation tail gas and recycling p-methyl-ethylbenzene. According to the preparation method provided by the invention, the raw material is high-purity p-methyl-ethylbenzene and does not contain harmful substances for reaction, so that the effective yield per unit mass of the catalyst is improved; and the water vapor is added in the process, so that the catalyst is protected and the reaction is diluted to a certain extent, the partial pressure is reduced, and the conversion rate of the reaction is improved.

Description

technical field [0001] The invention relates to the technical field of methyl styrene preparation, in particular to a process method for preparing p-methyl styrene by reacting p-methyl ethyl benzene. Background technique [0002] p-Methyl styrene has the characteristics of light weight, high softening point, radiation cross-linking, etc. It is an important raw material for the preparation of poly-p-methyl styrene series resins. The current process for preparing p-methyl styrene is not for today. It is very advanced and has high production costs, which affects the cultivation of downstream applications and markets. Coupled with artificial monopoly factors, it is sold at high prices. [0003] Moreover, the existing process still adopts the preparation method of original styrene, which requires many equipments, complex process, high energy consumption and large investment. SUMMARY OF THE INVENTION [0004] The main purpose of the present invention is to provide a process met...

AI Technical Summary

Problems solved by technology

[0002] p-methylstyrene has the characteristics of light weight, high softening point, and radiation crosslinking, and is an important raw material for preparing poly-p-methylstyrene series resins. The current process for preparing p-methylstyrene is not suitable for today Very advanced, high production cost, affecting the cultivation of downstream applications and markets, coupled with artificial monopoly factors, sold at high prices

[0003] Moreover, the existing process still adopts the preparation method of former styrene, which requires many equipment, complicated process, high energy consumption and large investment.

Images