Process for producing cumene

Abstract

The invention relates to a method for producing isopropyl benzene. The method mainly solves the problem of low selectivity of mono-isopropyl benzene in liquid phase alkylation reaction of benzene and propylene in the prior art. The propylene and the benzene are used as reaction raw materials in the method; the reaction raw materials are in contact with a catalyst to synthesize the isopropyl benzene in a liquid phase mode under the conditions that the reaction temperature is 100 to 170 DEG C, the reaction pressure is 1.5 to 2.8MPa, the molar ratio of the benzene to the propylene is 2 to 5 and the weight airspeed of the propylene is 0.2 to 8.0h<-1>; the catalyst comprises the following components in part by weight: a) 50 to 80 parts of at least one of Y, Beta and MCM-22 molecular sieves, and b) 20 to 50 parts of inorganic oxide; the catalyst is subjected to modifying treatment by using the mixed solution of the benzene and the isopropyl benzene, wherein the treatment temperature is 110 to 160 DEG C, the treatment pressure is 2.0 to 2.8MPa, the treatment time is 2 to 200 hours, and the weight airspeed of the mixed solution is 2 to 20h<-1>; and in the mixed solution of the benzene andthe isopropyl benzene, the weight ratio of the benzene to the isopropyl benzene is 15 to 80. According to the technical scheme, the problem is well solved, and the method can be used for industrial production of preparing the isopropyl benzene by propylene liquid phase alkylation.

Description

technical field [0001] The present invention relates to a method for producing cumene. Background technique [0002] Cumene is an important intermediate raw material for the production of phenol, acetone and α-methylstyrene. At present, more than 90% of phenol in the world is produced by the cumene method. The traditional method of producing cumene in industry has the solid phosphoric acid method (SPA method) of U.S. Universal Oil Company (UOP) and the improved AlCl of Monsanto / Lummus Crest company 3 Law. The operating conditions of SPA are harsh and there are many impurities, so the yield of cumene cannot be increased by anti-alkylation. while AlCl 3 Although the method has milder reaction conditions and can increase the yield of cumene through anti-alkylation, the catalyst is highly corrosive, polluted heavily and post-treatment is complicated. [0003] Molecular sieve liquid-phase alkylation method has mild reaction conditions, high conversion rate, good selectivity,...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is the problem of low selectivity of monocumene in the liquid-phase alkylation reaction of benzene and propylene in the prior art, and a new method for producing isopropylbenzene is provided