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. 11, 1993
Filed:
Jul. 16, 1992
Applicant:
Inventors:
Tatsumi Ichiki, Saitama, JP;
Kaori Mori, Saitama, JP;
Sadakatsu Suzuki, Saitama, JP;
Hiroshi Ueno, Saitama, JP;
Kenji Kobayashi, Saitama, JP;
Assignee:
Tonen Chemical Corporation, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
549295 ;
Abstract
Gamma-butyrolactone is prepared by catalytic dehydrogenation of 1,4-butanediol in a gaseous phase in the presence of a catalyst comprising copper, chromium, and manganese and/or barium. Improvement is in that the catalyst further contains sodium and/or potassium, whereby formation of by-products is suppressed and high yield, high selectivity and prolonged catalyst life are attained.