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. 23, 1997
Filed:
Mar. 15, 1996
Henricus F Wolters, Echt, NL;
Samuel L Lane, Beaumont, TX (US);
Wim Buijs, Schinnen, NL;
Nicolaas F Haasen, Sittard, NL;
Frank E Herkes, Wilmington, DE (US);
DSM N.V., Heerlen, NL;
E. I. DuPont de Nemours & Company, Wilmington, DE (US);
Abstract
A process for the preparation of .epsilon.-caprolactam and .epsilon.-caprolactam precursors, starting from the corresponding 5-formylvalerate ester, ammonia and hydrogen in the presence of a hydrogenation catalyst is disclosed, wherein in a step (a) 5-formylvalerate ester is reacted with ammonia under non-hydrogenating conditions, and in a step (b) the reaction product obtained in step (a) is converted to .epsilon.-caprolactam and the .epsilon.-caprolactam precursor(s) under hydrogenating conditions, in the presence of ammonia.