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. 24, 1977
Filed:
Jan. 12, 1976
Applicant:
Inventors:
Lothar Sandhack, Rheurdt, DT;
Werner Webers, Orsoy, DT;
Georg Michalczyk, Neukirchen-Vluyn, DT;
Karl-Heinz Gluzek, Alpen, DT;
Assignee:
Deutsche Texaco Aktiengesellschaft, Hamburg, DT;
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
2603436 ; 252460 ;
Abstract
A continuous process for producing gamma-butyrolactone by hydrogenating maleic anhydride in two stages in the presence of a catalyst composed of cobalt oxide and palladium on a support of silica. The hydrogenation is performed at a hydrogen pressure of 100 to 125 atmospheres and at a temperature of 50.degree. to 100.degree. C. in the first stage and at 190.degree. to 220.degree. C. in the second stage.