Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Patent
1998-03-09
1999-11-23
Killos, Paul J.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
562556, C07C32100, C07C31500
Patent
active
059903490
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.
REFERENCES:
patent: 4069251 (1978-01-01), Mannsfeld
patent: 4518801 (1985-05-01), Bolze
Database WPI, Section Ch. 1973 (73-64461U).
Database WPI, Section Ch. 1973 (73-64462U).
Terasawa "Preparation Methionine" Chemical Abstracts, vol. 120, No. 13, Mar. 28, 1994, Abstract 164902t.
Takagi "Alpha-Amino Acids" Chemical Abstracts, vol. 84, No. 7, Feb. 1976, Abstract 44666k.
Kojima "DL-Methinine Alkali" Chemical Abstracts, vol. 85, No. 7, Aug. 1986, Abstract 47049t.
Database WPI, Section Ch. Week 9122--1991 (91-159964).
Database WPI, Section Ch. 1973 (73-64461 U).
Mizuo "Preparation of Methionine" Chemical Abstracts, vol. 117, 1992, Abstract 172112p.
Geiger Friedhelm
Halsberghe Baudouin
Hasselbach Hans-Joachim
Hentschel Klaus
Huthmacher Klaus
Degussa - Aktiengesellschaft
Killos Paul J.
Parsa J.
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