Method for preparing methionine
AssigneeEvonik Operations GmbH
InventorsJudith Hierold, Daniel Sudhoff, Martin Steurenthaler, Hans Joachim Hasselbach, Philipp Roth, Thorsten Merker, Markus Held, Daniel Fischer, Christian Kaiser
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Abstract
The present invention relates to a method for preparing methionine or methionine salts. In particular, the invention describes the step of preparing 2-hydroxy-4-(methylthio)butyronitrile (MMP-CN) from 3-methylthiopropanal (MMP) and hydrogen cyanide (HCN) in the presence of ammonia by bringing a gaseous mixture comprising HCN and ammonia into contact with MMP.
Claims20
A method for preparing 2-hydroxy-4-(methylthio)butyronitrile, the method comprising:
- bringing a gas mixture comprising hydrogen cyanide and ammonia into contact with 3-methylmercaptopropionaldehyde, thereby producing a product mixture comprising 2-hydroxy-4-(methylthio)butyronitrile.
A method for preparing methionine or a salt of methionine, the method comprising:
- bringing a gas mixture comprising hydrogen cyanide and ammonia into contact with 3-methylmercaptopropionaldehyde, thereby producing a product mixture comprising 2-hydroxy-4-(methylthio)butyronitrile.
Dependencies are inferred from the claim text.