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:
Jan. 26, 2021
Filed:
Dec. 15, 2017
Applicant:
Evonik Operations Gmbh, Essen, DE;
Inventors:
Judith Hierold, Hannover, DE;
Daniel Sudhoff, Hanau, DE;
Martin Steurenthaler, Bad Vilbel, DE;
Hans Joachim Hasselbach, Gelnhausen, DE;
Philipp Roth, Hanau, DE;
Thorsten Merker, Erftstadt, DE;
Markus Held, Limeshain, DE;
Daniel Fischer, Midlothian, VA (US);
Christian Kaiser, Waldaschaff, DE;
Assignee:
Evonik Operations GmbH, Essen, DE;
Primary Examiner:
Int. Cl.
CPC ...
C07C 323/58 (2006.01);
U.S. Cl.
CPC ...
C07C 323/58 (2013.01);
Abstract
The present invention relates to a method for preparing methionine or methionine salts. In particular, the invention describes the step of preparing 2-hydroxy-4-(methylthio)butyronitrile (MMP-CN) from 3-methylthiopropanal (MMP) and hydrogen cyanide (HCN) in the presence of ammonia by bringing a gaseous mixture comprising HCN and ammonia into contact with MMP.