A method for adjusting the catalytic performance of a silver catalyst for ethylene epoxidation

By using rectangular pulsed flow to control the concentration of organochlorides during the ethylene epoxidation process, the problem of silver catalyst performance loss was solved, the stability and selectivity of the catalyst were improved, the formation of silver chloride was reduced, and the stability and economic benefits of the ethylene epoxidation process were enhanced.

CN117903085BActive Publication Date: 2026-06-12CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEMICAL CORP
Filing Date
2022-10-17
Publication Date
2026-06-12

AI Technical Summary

⚠Technical Problem

Existing technologies make it difficult to precisely control the concentration of organochlorides in silver catalysts in industrial production, leading to catalyst performance loss and abnormal reactions, which affect the stability and selectivity of the ethylene epoxidation process.

⚗Method used

Organic chlorides are introduced using a rectangular pulsed flow method, and their fluctuations are controlled at a low level. The adsorption and desorption equilibrium of chlorine components on the catalyst surface is achieved by adjusting the reaction parameters, avoiding excessive addition and instrument errors, and maintaining the catalyst activity and selectivity.

🎯Benefits of technology

Effectively regulate catalyst performance, reduce silver chloride formation, avoid abnormalities such as temperature runaway, maintain reaction parameters within the expected range, and improve catalyst life and economic benefits.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present application belongs to the field of ethylene epoxidation industry, and relates to a method for adjusting the catalytic performance of a silver catalyst for ethylene epoxidation. The method comprises: under a reaction temperature of 200-270 DEG C, making a raw material gas containing ethylene, oxygen, organic chloride and alkane regulator to occur epoxidation reaction in the presence of the silver catalyst to produce ethylene oxide, wherein the amount of the organic chloride is added in a pulse type rectangular wave. The method can freely and accurately control the reaction parameters such as selectivity and reaction temperature in the expected range, avoid the loss of catalyst performance caused by the excessive addition of chlorine due to instrument detection error, avoid abnormal problems such as temperature runaway, and obviously adjust and improve the performance of the silver catalyst. Since the organic chloride concentration of the raw material gas is kept at a low level for a long time, the generation of silver chloride is reduced, new substances are not introduced, the yield is not reduced, and shutdown is not required, and the method is suitable for the process of generating ethylene oxide by ethylene oxidation reaction.
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