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. 19, 2013
Filed:
Nov. 22, 2010
Axel Hengstermann, Senden, DE;
Ralf Meier, Dortmund, DE;
Daniel Demicoli, Essen, DE;
Martin Roos, Haltern am See, DE;
Bernd Guenzel, Schermbeck, DE;
Frank Huebner, Ober-Ramstadt, DE;
Axel Hengstermann, Senden, DE;
Ralf Meier, Dortmund, DE;
Daniel Demicoli, Essen, DE;
Martin Roos, Haltern am See, DE;
Bernd Guenzel, Schermbeck, DE;
Frank Huebner, Ober-Ramstadt, DE;
Evonik Degussa GmbH, Essen, DE;
Abstract
A process for purifying laurolactam by means of integrated connection of distillation and crystallization is provided. The crystallization is performed as a solution or melt crystallization. The process reduces thermal stress applied to the laurolactam stream and improved yields are obtained. Raw materials are recovered and recycled in the production sequence.