METHIONINE PRODUCTION METHOD AND PRODUCTION EQUIPMENT

WIPO Patent Application WO/2018/199294

A1

The present invention provides a methionine production method characterized by including: a step in which 5–[2–(methylthio) ethyl] imidazolidine–2,4–dione is hydrolyzed in the presence of an alkali compound and a reaction liquid that includes an alkali salt of methionine is obtained; a step in which methionine is precipitated by introducing carbon dioxide to the reaction liquid and a first slurry including the methionine is obtained; a step in which the first slurry is caused to flow into a pressure filter and solid methionine and mother liquor are obtained from the first slurry; and a step in which carbon dioxide is recovered from the mother liquor. As a result of this production method, carbon dioxide that has been introduced in a crystallization step is prevented from being released from the mother liquor and the carbon dioxide can be recovered.

WO/2001/005743	3-AMINO-2-BENZYL-1-PHENYL-PROPANE DERIVATIVES
JP2881443	[Title of Invention] A novel oxyalkylated quaternary ammonium compound, a method for producing the same, and a plant growth regulator containing the same as an active ingredient.

OMOTO NORIHITO (JP)
SATOH YOSHITAKA (JP)
MORIKAWA MASAYUKI (JP)
KOIZUMI YOSHIYUKI (JP)
YAMASHIRO NAOYA (JP)
KATAGAMI RYOUSUKE (JP)

PCT/JP2018/017210

November 01, 2018

April 27, 2018

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SUMITOMO CHEMICAL CO (JP)

C07C319/20; C07C319/28; C07C323/58

JP2007063141A	2007-03-15
JP2015515458A	2015-05-28
JPS60108357A	1985-06-13
JP2015140342A	2015-08-03
JP2017087751A	2017-05-25
JP2010111641A	2010-05-20

See also references of EP 3617187A4

YAMAO, Norihito et al. (JP)

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