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:
Jan. 09, 1979
Filed:
Jan. 20, 1978
Applicant:
Inventors:
Willem J Wassen, Geleen, NL;
Rudolf L Zwart, Geleen, NL;
Assignee:
Stamicarbon, B.V., Geleen, NL;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
2602 / ; 4235 / ;
Abstract
An improvement of processes for the recovery of .epsilon.-caprolactam wherein a neutralized sulfuric acid is subjected to thermal decomposition, forming a gaseous mixture of ammonia and sulfur dioxide which is thereafter converted to an aqueous solution of ammonium sulfite and/or ammonium hydrogen sulfite which is then used for neutralization of the reaction mixture of lactam and sulfuric acid.