Title:
CAPROLACTAM PREPARATION METHOD
Document Type and Number:
WIPO Patent Application WO/2016/112814
Kind Code:
A1
Abstract:
A caprolactam preparation method provided in the present invention comprises the following steps: (1) in the presence of an oxime catalyst and absence of any organic solvent, conducting an ammoximation on cyclohexanone, ammonia, and hydrogen peroxide in an aqueous solvent and at a temperature between 50 and 200 °C to obtain a solvent containing a cyclohexanone oxime; (2) extracting the solvent containing the cyclohexanone oxime with an inert organic solvent to obtain an extract phase containing the cyclohexanone oxime and a raffinate phase containing the oxime catalyst and water; (3) conducting a Beckmann rearrangement reaction on the extract phase and an oleum, then conducting a neutralization reaction between a product of the Beckmann rearrangement reaction and the ammonia. The method preparing caprolactam increases a yield of the caprolactam and eliminates refining process of the cyclohexanone oxime, thus greatly shortening a manufacturing procedure and lead time, while recycling the inert organic solvent by a rearrangement reaction heat recovery.
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Inventors:
LUO HEAN (CN)
ZHAO CHENGJUN (CN)
REN CHENGYUN (CN)
WU JIAN (CN)
LI WANQING (CN)
WEI TIANRONG (CN)
LEI FENGSHENG (CN)
CHEN HAO (CN)
ZHAO YUN (CN)
ZHAO CHENGJUN (CN)
REN CHENGYUN (CN)
WU JIAN (CN)
LI WANQING (CN)
WEI TIANRONG (CN)
LEI FENGSHENG (CN)
CHEN HAO (CN)
ZHAO YUN (CN)
Application Number:
PCT/CN2016/070245
Publication Date:
July 21, 2016
Filing Date:
January 06, 2016
Export Citation:
Assignee:
HUBEI JINXIANGNING CHEMICAL ENGINEERING TECHENOLOGY CO LTD (CN)
HUBEI SANNING CHEMI INDUSTRY CO LTD (CN)
HUBEI SANNING CHEMI INDUSTRY CO LTD (CN)
International Classes:
C07D201/04; C07D223/10
Foreign References:
JP2000080067A | 2000-03-21 | |||
CN1371905A | 2002-10-02 | |||
EP0735017A1 | 1996-10-02 | |||
CN101168524A | 2008-04-30 |
Other References:
See also references of EP 3246315A4
Attorney, Agent or Firm:
RUNPING&PARTNERS (CN)
北京润平知识产权代理有限公司 (CN)
北京润平知识产权代理有限公司 (CN)
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