METHOD FOR PREPARING 2,2'-AZOBIS-ISOBUTYRONITRILE Russian patent published in 2004 - IPC

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to a method for preparing 2,2'-azobis-isobutyronitrile used as a foaming agent for polymers and an initiating agent in radical polymerization of unsaturated hydrocarbons. Method involves interaction of acetone cyanohydrin with hydrazine hydrate in an aqueous medium followed by oxidation of intermediate 2,2'-hydrazobis-isobutyronitrile with hydrogen peroxide in acid medium in the presence of bromine or its compounds with using tungsten, vanadium and molybdenum compounds as a catalyst. The oxidation process is carried out in the presence of surface-active substances taken in the amount 0.05-1% of charged acetone cyanohydrin being without isolation of the intermediate compound. Method provides preparing the end substance with the yield 94-95.3% as measured for the parent hydrazine.

EFFECT: improved preparing method.

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