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. 08, 1979
Filed:
Dec. 28, 1977
Applicant:
Inventors:
Gerardus A Geurts, Schaesberg, NL;
Reijer Goettsch, Beek(L), NL;
Assignee:
Stamicarbon, B.V., Geleen, NL;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
2602 / ;
Abstract
A method of recovering .epsilon.-caprolactam from the residue remaining from the distillation of impure .epsilon.-caprolactam wherein the residue is treated with sulphuric acid or oleum at a temperature between about 80.degree. C. and about 140.degree. C. and the resultant mixture neutralized. The lactam is then extracted with an organic solvent with the lactam then recovered from the resultant solution.