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:
Oct. 25, 1988
Filed:
Jul. 06, 1987
Applicant:
Inventors:
Manfred zur Hausen, Marl, DE;
Werner Otte, Dorsten, DE;
Assignee:
Huels Aktiengesellschaft, Marl, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
548552 ; 548554 ;
Abstract
C.sub.1 -- to C.sub.6 -N-alkylpyrrolidones are produced from succinic anhydride and C.sub.1 -- to C.sub.6 -N-alkylamines or C.sub.1 -- to C.sub.6 --N-alkylsuccinimides. They are hydrogenated in the presence of a Ni hydrogenation catalyst containing from about 0.1-3% of one or several alkaline earth oxides and/or iron oxide and/or chromium oxide, at temperatures of from about 180.degree.-250.degree. C. and under pressures of at least about 100 bar. Preferably, a Ni catalyst is utilized which contains a total of 1.5-2% alkaline earth oxides, iron oxide and chromium oxide.