Molecular sieve catalyst for synthesizing methyl ethyl carbonate by transesterification method and regeneration method of molecular sieve catalyst

By designing a molecular sieve catalyst with a microporous dual-active-center core and an amphoteric mesoporous shell, and combining it with ultrasonic, ozone, and microwave regeneration technologies, the problems of uneven distribution of active centers, low selectivity, and poor regeneration performance of existing catalysts have been solved, achieving efficient and stable synthesis of ethyl methyl carbonate and reducing industrial costs.

CN121551073APending Publication Date: 2026-02-24RENQIU NORTH CHINA PETROLEUM CLEAN ENVIROMENTAL PROTECTION CO LTD
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Patent Information

Application Number
CN202511953548.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-23
Publication Date
2026-02-24

AI Technical Summary

Technical Problem

Existing catalysts for the transesterification synthesis of methyl ethyl carbonate suffer from uneven distribution of active sites, low catalytic selectivity, poor mass transfer efficiency, and unsatisfactory regeneration performance, making it difficult to meet the requirements of high efficiency, stability, and economy for industrial production.

Method used

The molecular sieve catalyst is designed with a microporous dual-active-center core and an amphoteric mesoporous shell. The core uses X-type zeolite as a support to load potassium, cesium, lanthanum and barium. The shell is a composite mesoporous silica layer of MCM-41 and SBA-15, with aminopropyltriethoxysilane and carboxyethyltriethoxysilane grafted on the surface and doped with zirconium and titanium. The regeneration method uses a three-in-one technology of ultrasound, ozone and microwave to remove carbon deposits and restore activity.

Benefits of technology

It significantly improves catalytic activity and selectivity, enhances mass transfer efficiency, and ensures long-term catalyst stability and reduces industrial application costs through efficient regeneration technology.

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Abstract

The invention discloses a molecular sieve catalyst for synthesizing methyl ethyl carbonate by a transesterification method and a regeneration method, and relates to the technical field of molecular sieve catalysts, the molecular sieve catalyst comprises a microporous double-active-center inner core and an amphoteric mesoporous shell; the microporous double-active-center core takes the X-type zeolite as a carrier to load potassium, cesium, lanthanum and barium; the amphoteric mesoporous shell is an MCM-41 and SBA-15 composite mesoporous silica layer coating the outer part of the inner core and has a double-mesoporous structure, amino propyl triethoxy silane and carboxyethyl triethoxy silane are grafted on the surface of the amphoteric mesoporous shell, and zirconium and titanium are co-doped. According to the invention, collaborative optimization of active centers and mass transfer channels is realized through a core-shell structure of a microporous double-active-center core and an amphoteric mesoporous shell. The activity and selectivity of catalytic transesterification are remarkably improved by the microporous core; due to the double-mesoporous structure and surface functional modification of the amphoteric mesoporous shell, the mass transfer efficiency of reactants and products is improved, and the adaptability of the catalyst to a reaction system is enhanced.
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