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:
Apr. 11, 2017
Filed:
Sep. 10, 2014
Stefan Reichert, Frankfurt, DE;
Harald Jakob, Hasselroth, DE;
Hans Joachim Hasselbach, Gelnhausen, DE;
Martin Koerfer, Kahl, DE;
Stefan Reichert, Frankfurt, DE;
Harald Jakob, Hasselroth, DE;
Hans Joachim Hasselbach, Gelnhausen, DE;
Martin Koerfer, Kahl, DE;
EVONIK DEGUSSA GmbH, Essen, DE;
Abstract
The invention relates to a method for crystallizing D,L-methionine from aqueous solutions and/or suspensions containing D,L-methionine and D,L-methionine ammonium salts, having a Met content of 70-180 g/kg, an NHcontent of 1-5 g/kg, in the presence of a crystallization additive, which comprises a nonionic or anionic surfactant or a mixture of various nonionic or anionic surfactants, in which the temperature of the solution and/or suspension is lowered directly or stepwise from T=85-110° C. to T=30-50° C., so that D,L-methionine precipitates as a solid.