Method for synthesizing mesitylene by gas-phase non-hydroisomerization of unsym-trimethylbenzene

By using EWT structured molecular sieve catalysts with ultra-large pores, the problem of easy catalyst deactivation was solved, and efficient production of mesitylene was achieved, meeting the needs of industrial production.

CN120864945APending Publication Date: 2025-10-31CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Application Number
CN202410542471.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-04-30
Publication Date
2025-10-31

AI Technical Summary

Technical Problem

Existing catalysts in the production of mesitylene suffer from short catalyst life and easy deactivation, especially under non-hydrogen-dependent gas phase conditions, making it difficult to maintain high selectivity and high conversion rate. Furthermore, industrial applications are subject to high energy consumption and demanding equipment requirements.

Method used

EWT structured molecular sieves with ultra-large pore structure were used as catalysts. EWT structured molecular sieves were prepared through two-stage hydrothermal crystallization and ion exchange steps and used for the gas-phase non-hydroisomerization reaction of pseudotrimethylbenzene. This improved the pore volume and acidity distribution of the catalyst and enhanced the catalytic effect.

Benefits of technology

It improves the conversion rate of pseudotrimethylbenzene and the selectivity and mass yield of mesitylene, extends the service life of the catalyst, slows down the carbon deposition of heavy components, and meets the continuous needs of large-scale industrial production.

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Abstract

The invention relates to a method for synthesizing mesitylene by gas-phase non-hydroisomerization of unsym-trimethylbenzene, which comprises the following step of: contacting the unsym-trimethylbenzene with a catalyst under a gas-phase non-hydroisomerization reaction condition in the presence of the catalyst, wherein the catalyst is an EWT structure molecular sieve, the total pore volume of the EWT structure molecular sieve is 0.20-0.51 cm < 3 >. G <-1 >, and the mesoporous volume is 0.11-0.37 cm < 3 >. G <-1 >. According to the method disclosed by the invention, the EWT structure molecular sieve with an ultra-large pore channel structure is adopted as the catalyst, and when the catalyst is used for synthesizing mesitylene through unsym-trimethylbenzene gas-phase non-hydroisomerization, the distribution conditions of raw materials and products are improved, the conversion rate of unsym-trimethylbenzene and the selectivity and the mass yield of mesitylene are improved, heavy component carbon deposition is slowed down, and the yield of mesitylene is improved. The service life of the catalyst is prolonged.
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