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:
May. 16, 2000
Filed:
Jul. 25, 1997
Applicant:
Inventors:
Kazuo Tanaka, Kurashiki, JP;
Kengi Nakaya, Kurashiki, JP;
Atsushi Ohkoshi, Kurashiki, JP;
Hideaki Fujita, Kurashiki, JP;
Assignee:
Mitsubishi Gas Chemical Company, Inc., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
549273 ;
Abstract
Disclosed is a process for producing .epsilon.-caprolactone which comprises distilling a reaction mixture obtained by oxidation of cyclohexanone to separate impurities, wherein .epsilon.-caprolactone separated in a rectifying column is contacted with an oxygen-containing gas and then distilled. Thereby, a high quality of .epsilon.-caprolactone of in which no coloration occurs during long time preservation can be produced by industrial advantages.