DISTILLATION PROCESSING OF ACETONE CYANOHYDRIN AND METHOD OF PRODUCING ALKYL ESTERS OF METHACRYLIC ACID AND DERIVATIVES Russian patent published in 2013 - IPC C07C253/08 C07C255/16 C07C57/04 C07C57/65 C07C67/20 C07C69/54 C07C231/06 C07C233/09 C08F20/18 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing acetone cyanohydrin. The disclosed method comprises the following steps: A) reacting acetone and hydrogen cyanide in a reactor to obtain a reaction mixture, wherein the reaction mixture is subjected to circulation and acetone cyanohydrin is obtained; B) cooling at least a portion of the reaction mixture; C) removing at least a portion of the obtained acetone cyanohydrin from the reactor; D) continuous distillation of the removed acetone cyanohydrin to obtain a bottom product of acetone cyanohydrin and an overhead product of acetone in a distillation column; E) returning at least a portion of the overhead product of acetone to step A, wherein during returning, the overhead product of acetone is kept at temperature lower than 60°C, and the reaction to produce acetone cyanohydrin is carried out in the presence of a base catalyst. The invention also relates to methods of producing an alkyl ester of methacrylic acid and methacrylic acid which, as one of the steps, include producing acetone cyanohydrin using the disclosed method, a method of producing polymers based at least in part on alkyl esters of methacrylic acid, an apparatus for producing alkyl esters of methacrylic acid and use thereof.

EFFECT: method enables to prevent splitting of the overhead product of acetone and, as a result, reduces formation of deposits in the system when producing acetone cyanohydrin.

19 cl, 7 dwg