Process for producing methionine

A technology of methionine and potassium bicarbonate, applied in the field of preparation of methionine, can solve the problems of loss of methionine and potassium bicarbonate, waste liquid treatment load and high consumption

Inactive Publication Date: 2007-03-07
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the treatment of the mother liquor which is discharged as waste liquor is not a good measure, because this leads to the loss of methionine and potassium bicarbonate contained therein, and the load and cost of waste liquor treatment are very high

Method used

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  • Process for producing methionine
  • Process for producing methionine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] [Reaction step (1)]

[0044] By introducing 100 parts / hour into the reactor containing 18.7% of 5-[(2-(methylthio)ethyl)]-2,4-imidazolidinedione aqueous solution, 1.0 parts / hour of potassium hydroxide, 67.6 parts / hour of the primary concentrate of the following first crystal mother liquor, and 25.8 parts / hour of the following second crystal solution, at a temperature of 173-178° C. under a pressure of 0.88 MPa (gauge pressure), with a residence time of 1 hours for the hydrolysis reaction.

[0045] [First crystallization step (2)]

[0046] The reaction solution (133.1 parts / hour) obtained by the previous hydrolysis reaction was mixed with 60.7 parts / hour of water and 0.023 parts / hour of polyvinyl alcohol, and introduced into the crystallization device. Then, crystallization was performed at 20° C. under a pressure of 0.3 MPa (gauge) of carbon dioxide gas to precipitate methionine. The obtained slurry was filtered, and the filtered residue was washed with water and the...

Embodiment 2-4

[0060] The same procedure as in Example 1 was repeated except that the secondary concentration ratio in the third crystallization step (4) of Example 1 was changed to the secondary concentration ratio shown in Table 1.

[0061] The respective recoveries of useful components in the obtained wet cake of the third crystal were measured and shown in Table 1 together with the results of Example 1.

[0062] Example

Embodiment 5-7

[0064] The same procedure as in Example 1 was repeated except that the crystallization temperature in the third crystallization step (4) of Example 1 was changed to the temperature shown in Table 2. The respective recoveries of useful components in the resulting wet cake of the third crystal were measured and shown in Table 2 together with the results of Example 1.

[0065] Example

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PUM

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Abstract

A process for producing methionine by (1) hydrolyzing 5-[2-(methylthio)ethyl]-2,9-imidazolinedione in the presence of a basic potassium compound; (2) precipitating methionine by introducing CO 2 into the reaction solution from the step (1) and separating the slurry into the precipitate and a mother liquid; (3) mixing the mother liquid from the step (2) with an alcohol, precipitating methionine and KHCO 3 by introducing CO 2 into the mixture, and separating the slurry into the precipitate and a mother liquid; and (4) concentrating the mother liquid from the step (3), precipitating methionine and KHCO 3 by introducing CO 2 into the concentrated solution, and separating the slurry into the precipitate and a mother liquid.

Description

technical field [0001] The present invention relates to the method for preparing methionine by hydrolyzing 5-[(2-(methylthio)ethyl)]-2,4-imidazolidinediones according to the following reaction formula (1): [0002] [0003] Methionine is useful as an animal feed additive. Background technique [0004] A conventional method for the preparation of methionine involves the hydrolysis of 5-[(2-(methylthio)ethyl)]-2,4-imidazolidinedione under alkaline conditions using basic potassium compounds such as potassium carbonate and potassium bicarbonate . In this method, carbon dioxide may be introduced into the reaction solution after hydrolysis, and methionine may be isolated and obtained in the form of crystals by crystallization. However, the mother liquor after separation of methionine still contains methionine in an amount corresponding to the solubility of methionine in the reaction medium, as well as potassium bicarbonate which is recycled as said ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C323/57C07C319/22
CPCC07C319/28A23K1/1634C07C319/20A23K20/142C07C323/58
Inventor 盐崎哲也井上刚
Owner SUMITOMO CHEM CO LTD
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