Title:
CAPROLACTAM SYNTHESIS METHOD FREE OF BY-PRODUCTION OF AMMONIUM SULFATE
Document Type and Number:
WIPO Patent Application WO/2024/000848
Kind Code:
A1
Abstract:
Provided in the present invention is a caprolactam synthesis method free of by-production of ammonium sulfate. By designing a special process route, selecting a specific solvent, and using cyclohexanone oxime as a raw material, a Beckmann rearrangement reaction is catalyzed by means of fuming sulfuric acid, thereby producing a caprolactam product. After the Beckmann rearrangement reaction, separating a caprolactam-sulfuric acid phase from a solvent phase may also reduce the reaction heat in the reaction process. In addition, by optimizing the reaction process route, no ammonia is consumed and the sulfuric acid is consumed only once, so that during long-period operation, the consumption of the sulfuric acid is basically zero. Finally, no ammonium sulfate is produced, and gentle reaction conditions and a high product yield are allowed.
Inventors:
ZHUANG DAWEI (CN)
LIU WENGANG (CN)
YANG QIWU (CN)
LIU XINWEI (CN)
WANG CONG (CN)
YANG KEJIAN (CN)
LIU WENGANG (CN)
YANG QIWU (CN)
LIU XINWEI (CN)
WANG CONG (CN)
YANG KEJIAN (CN)
Application Number:
PCT/CN2022/120386
Publication Date:
January 04, 2024
Filing Date:
September 22, 2022
Export Citation:
Assignee:
CHINA TIANCHEN ENG CORP (CN)
International Classes:
C07D201/04; C07D201/16; C07D223/10
Foreign References:
| CN110683989A | 2020-01-14 | |||
| CN115073343A | 2022-09-20 | |||
| CN101168524A | 2008-04-30 | |||
| CN107311929A | 2017-11-03 | |||
| CN1130181A | 1996-09-04 | |||
| CN1508128A | 2004-06-30 | |||
| US20140171638A1 | 2014-06-19 |
Attorney, Agent or Firm:
TIANJIN HEZHENG INTELLECTUAL PROPERTY AGENCY LTD. (CN)
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