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Process for producing methionine

A technology of methionine and mother liquor, which is applied in the preparation of sulfide, chemical instruments and methods, and the preparation of organic compounds, can solve the problems of loss, inappropriateness, and high cost of liquid waste treatment, and achieve the effect of improving the filtration rate

Active Publication Date: 2010-06-16
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disposal of the mother liquor thus cleaned as liquid waste results in a loss of methionine and potassium bicarbonate contained in the mother liquor, and the cost of disposing of the liquid waste is rather high
Therefore, this method is not appropriate

Method used

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  • Process for producing methionine
  • Process for producing methionine
  • Process for producing methionine

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Embodiment 1

[0053] [Reaction step (1)]

[0054] The hydrolysis reaction is carried out at a temperature of 173 to 178° C. for a residence time of 1 hour at a gauge pressure of 0.88 MPa under the condition that the following substances are introduced into the reactor: 5-[(2-( Methylthio) ethyl)] imidazolidine-2,4-dione aqueous solution (100 parts per hour), potassium hydroxide (1.0 parts per hour), the primary concentrated solution of the first crystallization mother liquor prepared separately (methyl sulfide amino acid concentration: 6.0%, and potassium concentration: 13.5%) (67.6 parts per hour), and the solution containing the second crystal (methionine concentration: 7.6%, and potassium concentration: 18.2%) prepared separately, that is, Concentrated solution of the second crystalline wet cake dissolved in the concentrated first crystalline mother liquor) (25.8 parts per hour).

[0055] [First crystallization step (2)]

[0056] The reaction solution (133.1 parts per hour) obtained by...

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Abstract

A process for producing methionine advantageously in view of cost, while efficiently recovering useful components, is provided. The present invention relates to a process for producing methionine, comprising the following steps (1), (2), (3) and (4): (1) a reaction step of hydrolyzing 5-[2-(methylthio)ethyl]imidazolidine-2,4-dione in the presence of a basic potassium compound; (2) a first crystallization step of introducing carbon dioxide into the reaction solution obtained in the step (1) to thereby precipitate methionine, and separating the resulting slurry into a precipitate and a mother liquor; (3) a second crystallization step of concentrating the mother liquor obtained in the step (2), mixing the resulting concentrate with a lower alcohol, introducing carbon dioxide into the resulting mixture to thereby precipitate methionine and potassium hydrogencarbonate, and separating the resulting slurry into a precipitate and a mother liquor; and (4) a heating step of concentrating the mother liquor obtained in the step (3), treating the resulting concentrate by heating at a temperature of from 150 to 200 DEG C, and recycling the treated solution for use in the step (3).

Description

[0001] The present application is filed to claim Paris Convention priority from Japanese Patent Application 2008-287060, the entire contents of which are incorporated herein by reference. technical field [0002] The present invention relates to a method for producing methionine by a hydrolysis reaction of 5-[(2-(methylthio)ethyl)]imidazolidine-2,4-dione [refer to the following reaction formula (1)]. Methionine can be used as an additive in animal feed. [0003] [chemical formula 1] [0004] Background technique [0005] The following method is known as one of the methods for producing methionine: namely, using a basic potassium compound such as potassium carbonate or potassium bicarbonate to make 5-[(2-(methylthio)ethyl)] Imidazolidine-2,4-dione is hydrolyzed under basic conditions to prepare methionine. In this method, carbon dioxide is introduced into the reaction solution obtained after hydrolysis, thereby causing crystallization, so that methionine is isolated and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C323/58C07C319/20C07C319/28
CPCC07C319/28C07C319/20C07C323/58
Inventor 古泉善行后藤晃权畔见拓志
Owner SUMITOMO CHEM CO LTD
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