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:
Mar. 10, 2009
Filed:
Nov. 11, 2003
Hermann Luyken, Ludwigshafen, DE;
Andreas Ansmann, Wiesloch, DE;
Christoph Benisch, Mannheim, DE;
Peter Baβler, Viernheim, DE;
Rolf-hartmuth Fischer, Heidelberg, DE;
Stefan Maixner, Schwetzingen, DE;
Johann-peter Melder, Böhl-Iggelheim, DE;
Hermann Luyken, Ludwigshafen, DE;
Andreas Ansmann, Wiesloch, DE;
Christoph Benisch, Mannheim, DE;
Peter Baβler, Viernheim, DE;
Rolf-Hartmuth Fischer, Heidelberg, DE;
Stefan Maixner, Schwetzingen, DE;
Johann-Peter Melder, Böhl-Iggelheim, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
The disclosure relates to a process for purifying crude caprolactam. The process involves converting a first mixture of 6-amino capronitrile and water to a second mixture of caprolactam ammonia, water, high boilers and low boilers using a catalyst. The ammonia is removed from the second mixture to obtain a third mixture. Water is removed from the third mixture to give crude caprolactam, high boiler and low boilers. Purified caprolactam is then obtained by a series of distillation steps.