Process for the treatment of spent catalyst, catalyst and process for the gas-phase beckmann rearrangement of cyclohexanone oxime

By processing the waste cyclohexanone oxime gas-phase Beckmann rearrangement catalyst, a highly crystalline spherical ZSM-5 type all-silica molecular sieve catalyst was formed, which solved the problem of the difficulty in utilizing waste catalysts, realized the regeneration and utilization of catalysts and reduced costs, and improved the stability and conversion rate of catalysts.

CN122164514APending Publication Date: 2026-06-09BEIJING RISUN TECH CO LTD
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BEIJING RISUN TECH CO LTD
Filing Date
2024-12-09
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

In existing technologies, the spent catalysts from the gas-phase Beckmann rearrangement reaction of cyclohexanone oxime are difficult to utilize, the catalyst preparation cost is high, and the catalyst life is short, which cannot meet the requirements of industrialization.

Method used

After carbonization treatment of the waste cyclohexanone oxime gas-phase Beckmann rearrangement catalyst, it was pulped and ground to a suitable particle diameter. KOH, organic template agent and alcohol were mixed to form a colloidal mixture. After crystallization and drying, it was shaped with a binder. It was then post-treated with an alkaline buffer solution containing ammonium salt, magnesium salt and bromide salt to form a highly crystalline spherical ZSM-5 type all-silica molecular sieve catalyst.

Benefits of technology

This approach enables catalyst regeneration, reduces the amount of silicon source and organic template agent used, improves catalyst stability and cyclohexanone oxime conversion, extends catalyst life, and enhances the economics of the new gas-phase rearrangement process.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN122164514A_ABST
    Figure CN122164514A_ABST
Patent Text Reader

Abstract

This invention relates to the field of catalyst technology and discloses a method for treating spent catalysts and a method for reacting a catalyst with a cyclohexanone oxime gas-phase Beckmann rearrangement, comprising: (1) carbonizing the spent cyclohexanone oxime gas-phase Beckmann rearrangement catalyst; (2) mixing the product obtained in step (1) with water and slurrying until the particle diameter in the slurry is less than 20 μm; (3) mixing the slurry, KOH, an organic template agent, and an alcohol to obtain a colloidal mixture; (4) crystallizing the colloidal mixture and then drying it to obtain molecular sieve powder; (5) optionally mixing the molecular sieve powder with a binder and then rotating it to obtain spherical particles; (6) calcining the spherical particles and then contacting them with an alkaline buffer solution containing ammonium salt, ammonia, magnesium salt, and bromide salt. The catalyst obtained by this treatment method can achieve both high conversion and selectivity in moving bed or fixed bed reaction systems.
Need to check novelty before this filing date? Find Prior Art