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:
Dec. 16, 1980
Filed:
Nov. 10, 1976
Applicant:
Inventors:
Harry Danziger, both Krefeld, DE;
Bernd-Ulrich Kaiser, both Krefeld, DE;
Assignee:
Bayer Aktiengesellschaft, Leverkusen, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
2602 / ;
Abstract
A process for the purification of acid-containing crude caprolactam obtained by the rearrangement of cyclohexanone oxime, wherein the crude caprolactam is mixed with from 0.8 to 2.0 equivalents of a base, from 3 to 6 parts by weight of toluene, based on caprolactam and from 2 to 10 parts by weight of water, based on inorganic constituents, separating the mixture into a toluene phase and two aqueous phases the upper of which containing all contaminants and discarding this phase.