Title:
ε-カプロラクタムの製造方法
Document Type and Number:
Japanese Patent JP4182273
Kind Code:
B2
Abstract:
A high purity epsilon -caprolactam is prepared by pouring a molten crude epsilon -caprolactam and a solvent comprising an aliphatic hydrocarbon and having a lower temperature than that of the crude epsilon -caprolactam, into a vessel and mixing them to obtain a first slurry containing a crystallized epsilon -caprolactam. The slurry is then subjected to a solid-liquid separation to obtain epsilon -caprolactam and a first liquid phase. This process can effectively remove impurities from a crude epsilon -caprolactam, which is obtained by for example, subjecting cyclohexanone oxime to the Beckmann rearrangement.
Inventors:
Yasuki Shimazu
Hiroyuki Kaita
Masami Fukao
Hiroyuki Kaita
Masami Fukao
Application Number:
JP2000192350A
Publication Date:
November 19, 2008
Filing Date:
June 27, 2000
Export Citation:
Assignee:
Sumitomo Chemical Co., Ltd.
International Classes:
C07D201/16; C07D223/10; C07B61/00
Domestic Patent References:
| JP2000247948A |
Attorney, Agent or Firm:
Toru Nakayama