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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.:

US 4170592 B1

PDFFull Text
Date of Patent:
Oct. 09, 1979

Filed:

Sep. 09, 1977

Purification of .epsilon.-caprolactam

Applicant:
Inventors:

Harry Danziger, Krefeld, DE;

Bernd-Ulrich Kaiser, Krefeld, DE;

Guido Rampart, Ekeren, BE;

Jurgen Schroter, Krefeld, DE;

Assignee:

Bayer Aktiengesellschaft, , DE;

Attorney:

Connolly and Hutz

Primary Examiner:

Natalie Trousof

Assistant Examiner:

Robert T Bond

Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
2602 / ;
Abstract

A process for the purification of a solution of .epsilon.-caprolactam in benzene, toluene or xylene by washing with a liquid, wherein the washing liquid is a solution of .epsilon.-caprolactam in water in a weight ratio of from 15 : 1 to 1 : 3, which is used in a quantity of from 5 to 20% by weight, based on the solution of caprolactam in benzene, toluene or xylene, and wherein there are several washing stages so that the equilibrium between the two solutions can be readjusted.

Find Patent Forward Citations

Danziger, Harry. (1979). Purification of .epsilon.-caprolactam (U.S. Patent No. 4170592). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4170592

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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