发明专利
- 专利标题： Method for producing methionine
- 专利标题（中）： 甲磺酸生产方法
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申请号： JP2008287059申请日： 2008-11-07
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公开(公告)号： JP2010111640A公开(公告)日： 2010-05-20
- 发明人: KOIZUMI YOSHIYUKI , GOTO AKINORI , AZEMI TAKUSHI
- 申请人： Sumitomo Chemical Co Ltd , 住友化学株式会社
- 专利权人： Sumitomo Chemical Co Ltd,住友化学株式会社
- 当前专利权人： Sumitomo Chemical Co Ltd,住友化学株式会社
- 优先权： JP2008287059 2008-11-07
- 主分类号： C07C319/20
- IPC分类号： C07C319/20 ; C07B61/00 ; C07C319/28 ; C07C323/58
摘要：
PROBLEM TO BE SOLVED: To provide a production method advantageous in cost, for efficiently carrying out the recovery of valuable components.
SOLUTION: The method for producing methionine includes the following steps (1), (2), (3) and (4): (1) a reaction step: a step of hydrolyzing 5-[2-(methylthio)ethyl]imidazolidine-2, 4-dione in the presence of a basic potassium compound; (2) a first crystallization step: a step of crystallizing the methionine by introducing carbon dioxide to the reaction liquid obtained in the step (1), and separating the obtained slurry into a precipitate and a mother liquor; (3) a second crystallization step: a step of concentrating the mother liquor obtained in the step (2), mixing the concentrated liquor with a lower alcohol, introducing the carbon dioxide to the resultant mixed liquid to precipitate the methionine and potassium hydrogen carbonate, and separating the obtained slurry into a precipitate and a mother liquor, and (4) a heating step: a step of concentrating the mother liquor obtained in the step (3), subjecting the concentrated liquor to heat treatment within the range of 150-200°C, and recycling the heat-treated product to the step (2).
COPYRIGHT: (C)2010,JPO&INPIT
SOLUTION: The method for producing methionine includes the following steps (1), (2), (3) and (4): (1) a reaction step: a step of hydrolyzing 5-[2-(methylthio)ethyl]imidazolidine-2, 4-dione in the presence of a basic potassium compound; (2) a first crystallization step: a step of crystallizing the methionine by introducing carbon dioxide to the reaction liquid obtained in the step (1), and separating the obtained slurry into a precipitate and a mother liquor; (3) a second crystallization step: a step of concentrating the mother liquor obtained in the step (2), mixing the concentrated liquor with a lower alcohol, introducing the carbon dioxide to the resultant mixed liquid to precipitate the methionine and potassium hydrogen carbonate, and separating the obtained slurry into a precipitate and a mother liquor, and (4) a heating step: a step of concentrating the mother liquor obtained in the step (3), subjecting the concentrated liquor to heat treatment within the range of 150-200°C, and recycling the heat-treated product to the step (2).
COPYRIGHT: (C)2010,JPO&INPIT
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