Molecular sieve based catalyst and preparation method thereof as well as application to side chain alkylation reaction of methyl alcohol and methylbenzene

Abstract

The invention discloses a molecular sieve based catalyst and a preparation method thereof as well as application to the side chain alkylation reaction of methyl alcohol and methylbenzene. The preparation method specifically comprises the steps that a water source is added into a silicon source to dilute, then a template agent, an aluminum source and a sodium source are added sequentially and stirred uniformly after each adding is completed, and a liquid mixture is obtained; a silylating reagent is added after the liquid mixture is subjected to ageing at the room temperature and stirred uniformly, a crystallization reaction is conducted under the moderate and continuous stirring conditions after the materials are stirred uniformly, the product is washed and filtered after the reaction is ended, the obtained solid is dried and calcinated, and a molecular sieve based catalyst precursor is obtained; and the molecular sieve based catalyst precursor is placed into an alkali metal salt solution to be subjected to alkali metal ion exchanging, the obtained exchanged sample is filtered, dried and calcinated, and the molecular sieve based catalyst is obtained. The molecular sieve based catalyst is specifically applied to preparing styrene in the side chain alkylation reaction of methyl alcohol and methylbenzene. The physical and chemical features of the molecular sieve based catalyst arechanged by optimizing the preparation conditions of the molecular sieve, and the methyl alcohol conversion rate, and the selectivity and yield of styrene are finally and effectively improved.

Description

technical field [0001] The invention relates to the technical field of molecular sieve catalyst preparation and modification, and more specifically, relates to a molecular sieve catalyst, a preparation method thereof, and an application in side-chain alkylation reactions of methanol and toluene. Background technique [0002] In the contemporary chemical industry, styrene, as an important raw material for organic synthesis, is widely used in the production of polystyrene, styrene-butadiene rubber, ion exchange resins, medicines and dyes, etc. The output of its series of chemical materials is second only to that of the world's high-yield polymers. The output ranks in the forefront of the synthetic resin production in the world. The traditional styrene production process mostly uses benzene and ethylene to produce ethylbenzene, and then catalyzes dehydrogenation to produce styrene products. This process has long routes, high catalyst bed temperature (600°C-660°C), high energy c...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the molecular sieve catalysts in the prior art for methanol and toluene side chain alkylation reactions such as low selectivity to styrene and low catalyst life, and to provide a catalyst with better performance and applied to methanol and toluene side chain alkanes. Molecular sieve catalyst for alkylation reaction and its preparation method and application

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