FIELD: chemistry.
SUBSTANCE: invention relates to a method for producing 2-hydroxy-4-(methylthio)butanenitrile, wherein 3-(methylmercapto)-propionaldehyde is reacted with hydrogen cyanide in presence of a base as catalyst into nitrile in a main reaction zone, and residual gaseous hydrogen cyanide quantities that exit main reaction zone are absorbed in an absorption- and post-reaction zone containing a mixture of 3-(methylmercapto)-propionaldehyde and catalyst, as well as optionally 2-hydroxy-4-(methylthio)butanenitrile and subjected to further conversion with 3-(methylmercapto)-propionaldehyde with subsequent removal of product, containing 2-hydroxy-4-(methylthio)butanenitrile, where in output product molar ratio between hydrogen cyanide and unreacted 3-(methylmercapto)-propionaldehyde is greater than 1.
EFFECT: method enables to obtain storage-stable during storage cyanohydrin and increases output of end product.
24 cl, 1 dwg, 2 ex
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