Title:
METHOD FOR PRODUCING HIGH-QUALITY ε-CAPROLACTAM
Document Type and Number:
WIPO Patent Application WO/2013/094339
Kind Code:
A1
Abstract:
A method for producing a high-quality ε-caprolactam, the method involving a crystallization step for crystallizing a high-quality ε-caprolactam by pouring and combining, into and with a crystallization solution in a container, a melted rough ε-caprolactam and a mixed solvent of a cyclohexane and an n-heptane having a temperature that is 20 to 100°C lower than the crystallization temperature of the melted ε-caprolactam, wherein the container is equipped with a stirring instrument and a baffle, and the melted rough ε-caprolactam and the mixed solvent are poured and combined while injecting the entire baffle in the container into the crystallization solution when the stirring instrument is being used during the crystallization step.
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| JPS53147085 | METHOD OF PURIFYING CAPROLACTUM |
Inventors:
SUNAMI JUNJI (JP)
NAGAMI HIDETO (JP)
YOKOTA TETSUYA (JP)
NAGAMI HIDETO (JP)
YOKOTA TETSUYA (JP)
Application Number:
PCT/JP2012/079228
Publication Date:
June 27, 2013
Filing Date:
November 12, 2012
Export Citation:
Assignee:
SUMITOMO CHEMICAL CO (JP)
International Classes:
C07D201/16; B01D9/02; C07D223/10; B01F7/16
Foreign References:
| JP2008308461A | 2008-12-25 | |||
| JP2004168673A | 2004-06-17 | |||
| JP2002003472A | 2002-01-09 | |||
| JPH05228301A | 1993-09-07 | |||
| JP2011201865A | 2011-10-13 | |||
| JPH10156103A | 1998-06-16 | |||
| JP2002306902A | 2002-10-22 |
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
Sumio Tanai (JP)
Sumio Tanai (JP)
Download PDF:
Claims:
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