Patent ID: 6417385
Filing Date: 2002-07-09
Classification: C07C

Abstract:
A process for the continuous production of acetone cyanohydrin, comprising conversion of hydrogen cyanide with acetone in the presence of a basic catalyst and acetone cyanohydrin in a gas/liquid reactor to which acetone and a gas mixture containing hydrogen cyanide and inert gases are supplied continuously and from which a liquid phase containing acetone cyanohydrin and a gas phase containing the inert gases are carried away, and separation of volatile constituents from the liquid phase by distillation, characterized in that the gas phase which has been carried away out of the reactor is freed of unconverted hydrogen cyanide and acetone in a gas-washer which is subjected to the action of a solvent boiling at 100 to 200Â° C. at normal pressure or of acidically stabilized pure acetone cyanohydrin substantially free of acetone and hydrogen cyanide, and the washed phase which is obtained is supplied to the gas/liquid reactor.