The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 26, 2001
Filed:
Dec. 27, 1999
Applicant:
Inventors:
Masami Fukao, Shiga, JP;
Kan Takamine, Osaka, JP;
Assignee:
Sumitomo Chemical Company, Limited, Osaka, JP;
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
C07D / ;
Abstract
A high purity &egr;-caprolactam is prepared by crystallizing an &egr;-caprolactam from a hydrocarbon solution containing a crude &egr;-caprolactam, and allowing the crystallized &egr;-caprolactam in contact with hydrogen in the presence of a hydrogenation catalyst. This process can effectively remove impurities from a crude &egr;-caprolactam, which is obtained by subjecting cyclohexanone oxime to the Beckmann rearrangement, and provide a high purity &egr;-caprolactam.