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:
Oct. 05, 2010
Filed:
Oct. 02, 2008
Applicants:
Axel Hengstermann, Senden, DE;
Ralf Meier, Dortmund, DE;
Bernd Günzel, Haltern am See, DE;
Martin Roos, Haltern am See, DE;
Stephan Schäflein, Haltern am See, DE;
Bernd-holger Modrow, Herne, DE;
Inventors:
Axel Hengstermann, Senden, DE;
Ralf Meier, Dortmund, DE;
Bernd Günzel, Haltern am See, DE;
Martin Roos, Haltern am See, DE;
Stephan Schäflein, Haltern am See, DE;
Bernd-Holger Modrow, Herne, DE;
Assignee:
Evonik Degussa GmbH, Essen, DE;
Primary Examiner:
Int. Cl.
CPC ...
C07D 225/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
The present invention provides a method for purifying laurolactam from a crude lactam mixture. In the method of the present invention, laurolactam is selectively crystallized by melt crystallization with controlled cooling of the crude lactam mixture.