Invention Application
- Patent Title: PROCESS FOR THE PREPARATION OF METHIONINE
- Patent Title (中): 制备甲硫氨酸的方法
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Application No.: US14386165Application Date: 2013-02-26
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Publication No.: US20150051421A1Publication Date: 2015-02-19
- Inventor: Martin Koerfer , Hans Joachim Hasselbach , Stefan Reichert , Harald Jakob , Christoph Weckbecker , Klaus Huthmacher , Horst Krull , Bernd Drapal , Rainer Peter
- Applicant: Martin Koerfer , Hans Joachim Hasselbach , Stefan Reichert , Harald Jakob , Christoph Weckbecker , Klaus Huthmacher , Horst Krull , Bernd Drapal , Rainer Peter
- Applicant Address: DE Essen
- Assignee: EVONIK INDUSTRIES AG
- Current Assignee: EVONIK INDUSTRIES AG
- Current Assignee Address: DE Essen
- Priority: EP12160257.7 20120320
- International Application: PCT/EP2013/053795 WO 20130226
- Main IPC: C07C319/12
- IPC: C07C319/12 ; C07C323/52

Abstract:
The invention relates to a process for the preparation of D,L-methionine, in which carbon dioxide is fed to an aqueous potassium methioninate solution obtained by hydrolysis of 5-(2-methylmercaptoethyl)hydantoin, in order to precipitate out crude methionine, which is separated off and purified, where, for the purposes of purification, an aqueous solution of the separated-off crude methionine is prepared and subjected to a recrystallization, characterized in that the solution from which the recrystallization takes place contains potassium ions and also a crystallization additive, where the crystallization additive is a nonionic or anionic surfactant, or a mixture of different nonionic or anionic surfactants, and that the recrystallization takes place by introducing a 60 to 110° C.-hot methionine solution into a 35 to 80° C.-warm methionine suspension, the temperature of which is lower than that of the introduced solution, the temperature of the methionine suspension being maintained between 35 and 80° C. during the addition.
Public/Granted literature
- US09156782B2 Process for the preparation of methionine Public/Granted day:2015-10-13
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