Title:
METHOD OF MANUFACTURING EPSILON-CAPROLACTAM
Document Type and Number:
WIPO Patent Application WO/2011/108251
Kind Code:
A1
Abstract:
An epsilon-caprolactam manufacturing method capable of manufacturing in good yield, high-quality epsilon-caprolactam containing less impurity has an epsilon-caprolactam purification step A of obtaining purified epsilon-caprolactam from raw epsilon-caprolactam by applying a drop crystallization method, a first-stage epsilon-caprolactam recovery step B of obtaining first recovered epsilon-caprolactam and a first recovered mother liquor by applying an evaporative crystallization method to a crystallization mother liquor obtained in the epsilon-caprolactam purification step A, and a second-stage epsilon-caprolactam recovery step C of obtaining second recovered purified epsilon-caprolactam by applying a melt crystallization method to the first recovered mother liquor, first recovered epsilon-caprolactam being recovered as a raw material for the epsilon-caprolactam purification step A and second recovered purified epsilon-caprolactam being recovered as a raw material for the epsilon-caprolactam purification step A and/or the first-stage epsilon-caprolactam recovery step B.
Inventors:
NAGAMI HIDETO (JP)
Application Number:
PCT/JP2011/001176
Publication Date:
September 09, 2011
Filing Date:
March 01, 2011
Export Citation:
Assignee:
SUMITOMO CHEMICAL CO (JP)
NAGAMI HIDETO (JP)
NAGAMI HIDETO (JP)
International Classes:
C07D201/16; C07D223/10
Domestic Patent References:
| WO2005075403A1 | 2005-08-18 |
Foreign References:
| EP1167350A1 | 2002-01-02 | |||
| JP2002003472A | 2002-01-09 | |||
| GB1361922A | 1974-07-30 |
Other References:
See also references of EP 2542523A4
Attorney, Agent or Firm:
Fukami Patent Office, p.c. (2-7 Nakanoshima 2-chome, Kita-ku, Osaka-sh, Osaka 05, JP)
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Claims: