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:
Jun. 23, 1998
Filed:
Dec. 18, 1996
Friedhelm Geiger, Erlensee, DE;
Baudouin Halsberghe, Mobile, AL (US);
Hans-Joachim Hasselbach, Gelnhausen, DE;
Klaus Hentschel, Rodenbach, DE;
Klaus Huthmacher, Gelnhausen, DE;
Martin Korfer, Johannesberg, DE;
Sven-Peter Mannsfeld, Mobile, AL (US);
Herbert Tanner, Hanau, DE;
Ferdinand Theissen, Bornheim, DE;
Jose Vanrobaeys, Mobile, AL (US);
Klaus Willigerodt, Mobile, AL (US);
Degussa Aktiengesellschaft, Frankfurt, DE;
Abstract
A process for the preparation of methionine or a salt of methionine by reaction of the components 3-methylmercaptopropionaldhyde, hydrogen cyanide, ammonia and carbon dioxide or components from which the above-mentioned components can be prepared, optionally in the presence of water, to 5-(2-methylmercaptoethyl)-hydantoin and further reaction thereof to methionine or the salt thereof, characterised in that the reaction of the components is initiated by means of at least one premixture in such a way that a first mixture is formed containing at least the predominant proportion (at least 5/10) of the 3-methylmercaptopropionaldeyde and at least 1/10 of the hydrogen cyanide component or corresponding quantities of components from which these components can be prepared, and less than 5/10 of one of the components ammonia, carbon dioxide or of the components from which ammonia or carbon dioxide can be prepared, and in that this first mixture is combined with the other component(s) for the reactive conversion to 5-(2-methylmercaptoethyl)-hydantoin, wherein this (these) latter component(s) may be premixed in one or more other mixtures.