Side chain alkylation method of toluene with methanol

Abstract

The invention mainly relates to a side chain alkylation method of toluene with methanol, and mainly solves the problems of low toluene conversion rate and low ethylbenzene and styrene selectivity when a catalyst used in the prior art is used for side chain alkylation reaction of toluene with methanol. The method adopts the following technical scheme: by taking toluene and methanol as raw materials, the raw materials are enabled to be in contact with an X molecular sieve catalyst under the conditions that the reaction temperature is 200-600 DEG C, the reaction pressure is 0-0.5 MPa and the weight space velocity of the raw materials is 0.5-10 h<-1>, and reaction is performed to generate ethylbenzene and styrene, wherein mol ratio of the toluene to the methanol in the raw materials is (0.1-10):1; the silicon-aluminum mol ratio SiO2 / Al2O3 of the X molecular sieve is 2-3, and the K<+> / (K<+>+Na<+>) is more than 0-90%; and the X molecular sieve catalyst is subjected to ion exchange respectively through at least one of a potassium-ion-containing solution, a rubidium-ion-containing solution or a cesium-ion-containing solution before being used. Thus, the problems are well solved. The method can be used for industrial production of ethylbenzene and styrene preparation through side chain alkylation reaction of toluene with methanol.

Description

technical field

[0001] The invention relates to a side chain alkylation method of toluene methanol. Background technique

[0002] Alkylation of toluene and methanol is a route with potential application prospects for the production of styrene. In 1967, Sidorenko et al. first used alkali metal ion-exchanged X-type and Y-type zeolites as catalysts to successfully synthesize ethylbenzene and styrene with toluene and methanol. . Compared with the traditional process, this method has the advantages of wide source of raw materials, low cost, low energy consumption, and less pollution. Therefore, once the reaction was reported, people paid attention to it, and the research on this aspect also began to increase.

[0003] In the prior art, low-silicon-alumina-ratio X zeolite is mostly prepared in a high-basic water-sodium system or potassium-sodium system, using low-temperature long-term crystallization or low-temperature aging and then temperature-rising crystallization. As discl...

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