A process for producing methionine, while corrosion of a pipe and a reaction vessel is well inhibited, is provided including the following steps (1) to (3), wherein a content of thiols in 3-methylthiopropanal is 500 ppm or less, based on the propanal, and a content of hydrogen sulfide in 3-methylthiopropanal is 60 ppm or less, based on the propanal; step (1) in which 3-methylthiopropanal is reacted with hydrogen cyanide in the presence of a base to give 2-hydroxy-4-methylthiobutanenitrile; step (2) in which the 2-hydroxy-4-methylthiobutanenitrile obtained in step (1) is reacted with ammonium carbonate to give 5-(β-methylmercaptoethyl)hydantoin; and step (3) in which the 5-(β-methylmercaptoethyl)hydantoin obtained in step (2) is hydrolyzed in the presence of a basic potassium compound to give methionine.
METHOD FOR THE CONVERSION OF METHYLMERCAPTOPROPIONALDEHYDE FORMED FROM CRUDE ACROLEIN AND CRUDE METHYL MERCAPTAN
申请人:Steffan Martin
公开号:US20130245318A1
公开(公告)日:2013-09-19
A reactive rectification column suitable for the production of 2-hydroxy-4-methylmercaptobutyric acid and/or methionine contains a weir having a height of 100 mm or more.
A reaction system suitable for production of a methionine salt contains a reactive rectification column containing a weir having a height of 100 mm or more.
适用于甲硫氨酸盐生产的反应系统包含一个反应精馏塔,其中包含一个高度为100毫米或更高的堰板。
Production Method of Methionine
申请人:SUMITOMO CHEMICAL CO., LTD.
公开号:EP2360144A1
公开(公告)日:2011-08-24
The present invention aims to provide a method of producing methionine by hydrolyzing M-hydantoin in the presence of a basic potassium compound, which can effectively prevent corrosion of reaction vessels in both the liquid phase and gaseous phase of a hydrolysis solution even at a higher temperature, and enables a longer period of stable production of methionine. Provided is a method of producing methionine, comprising hydrolyzing 5-(β-methylmercaptoethyl)hydantoin in water in the presence of a basic potassium compound in a reaction system having a potassium concentration of not more than 9 wt% at a temperature of not less than 170°C.