FIELD: chemical technology. SUBSTANCE: method involves contact of reaction mixture containing organic solvent, aldehyde and hydrocyanic acid by passing through porous diaphragm. The latter has resin-like polymeric binding agent containing finely milled filling agent particles dispersed in binding agent where enzyme S-hydroxynitrilase is bound chemically by immobilization by cobalent or cross-linking enzyme bonds with binding agent. Diaphragm is activated chemically with polyethyleneimine and glutaric dialdehyde. Method is used in agriculture, an intermediate product for insecticides production. EFFECT: improved method of producing. 10 cl, 4 tbl
