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Patent Searching and Data


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.

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)
Application Number:
PCT/CN2016/070245
Publication Date:
July 21, 2016
Filing Date:
January 06, 2016
Export Citation:
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Assignee:
HUBEI JINXIANGNING CHEMICAL ENGINEERING TECHENOLOGY CO LTD (CN)
HUBEI SANNING CHEMI INDUSTRY CO LTD (CN)
International Classes:
C07D201/04; C07D223/10
Foreign References:
JP2000080067A2000-03-21
CN1371905A2002-10-02
EP0735017A11996-10-02
CN101168524A2008-04-30
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)
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