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Method for producing methionine

A manufacturing method and technology of methionine, applied in chemical instruments and methods, preparation of organic compounds, preparation of sulfides, etc., can solve problems such as unimaginable

Active Publication Date: 2012-01-11
SUMITOMO CHEM CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, in Japanese Patent Application Laid-Open No. 2003-81605, it is not envisioned to use the hydrogen and carbon dioxide generated and recovered during the production of hydrogen as raw materials for the production of methionine.

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  • Method for producing methionine
  • Method for producing methionine
  • Method for producing methionine

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Embodiment Construction

[0026] The best embodiment of the present invention will be described in detail with reference to the following drawings.

[0027] The method for producing methionine of the present invention is a method for producing methionine using hydrogen and carbon dioxide generated and recovered during hydrogen production, and includes a hydantoin step, a hydrolysis step, and a crystallization step. In addition, the hydantoin step includes a hydrogen sulfide step, a methylthiolation step, acroleinization step, a methylthiopropionylation step, a cyanohydrinization step, and a hydantoinization step.

[0028] In the hydrogen sulfide gas process, as shown in the following formula (1), hydrogen (H 2 ) react with sulfur (S) to give hydrogen sulfide (H 2 S). Hydrogen gas is used in this hydrogen sulfide step.

[0029] h 2 +S→H 2 S...(1)

[0030] In the methyl mercaptan step, methyl mercaptan (CH 3 SH). It should be noted that CH in formulas (2), (3), and (4) 3 OH means methanol, CH 3...

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Abstract

A method for producing methionine includes a hydrolyzing step of hydrolyzing 5-([beta]-methylmercaptoethyl)hydantoin, and a crystallizing step of crystallizing with carbon dioxide introduced into a reaction solution after hydrolysis, to obtain methionine. In the crystallizing step, as carbon dioxide introduced into the hydrolysis reaction solution, carbon dioxide that is separated in a carbon dioxide separation section (15) from a reformed gas formed by steam reforming reaction in a steam reformation section (13) and carbon dioxide that is separated in an exhaust gas separation section (17) from a combustion exhaust gas generated by pure oxygen combustion in a hydrocarbon heating furnace (12) and a reformation reaction heating furnace (132) are used.

Description

technical field [0001] The present invention relates to a method for producing methionine using carbon dioxide separated and recovered from combustion exhaust gas obtained by a pure oxygen combustion method. Background technique [0002] As a method for producing methionine, there is known a method of producing methionine by using 3-methylthiopropanal as a raw material, reacting it with cyanic acid in the presence of a base, then reacting with ammonium carbonate, and hydrolyzing it . In this method, methionine can be isolated and obtained in the form of crystals by introducing carbon dioxide into the hydrolyzed reaction solution to carry out crystallization. [0003] As the carbon dioxide introduced into the hydrolyzed reaction liquid, carbon dioxide produced during the production of hydrogen by steam reforming reaction (Steam reforming reaction) and carbon dioxide obtained by cleaning and refining exhaust gas generated from boilers and the like can be used. However, since...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C323/58C07C319/20
CPCC01B3/384C01B2203/1258C01B2203/06C01B2203/0233C01B2203/0475C07C319/20C01B2203/0288C07D233/76C01B2203/1252C01B2203/1058C01B2203/043C07C319/28C01B2203/1064C01B17/162C07C323/58C07C319/18
Inventor 吉川元庸中筋雄大
Owner SUMITOMO CHEM CO LTD
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