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:
Aug. 03, 1993
Filed:
Jun. 30, 1992
Applicant:
Inventor:
Hiroto Tanigawa, Hyogo, JP;
Assignee:
Daicel Chemical Industries, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
502 22 ; 558277 ;
Abstract
A process for producing a carbonic acid ester which comprises reacting an alcohol with carbon monoxide and oxygen in the presence of a catalyst comprising a compound of divalent copper is disclosed, wherein the catalyst deactivated as a result of the carbonic acid ester-producing reaction is regenerated by subjecting a reaction mixture or a concentrate thereof containing the deactivated catalyst to water-replacement treatment, followed by heat treatment and weak-acid treatment.