METHOD OF SYNTHESIS OF DIMETHYLDITHIOCARBAMATE SODIUM Russian patent published in 2000 - IPC

FIELD: organic chemistry, chemical technology. SUBSTANCE: invention relates to methods of synthesis of dimethyldithiocarbamate sodium used as vulcanization accelelerating agent, flotoagent in concentration of nonferrous metal ores. Method involves condensation that is carried out by interaction of carbon disulfide with dimethylamine in alkaline medium using reagents of parent solution of dimethyldithiocarbamate sodium as solvents. Then method involves cleaning filtration, crystallization and filtration of the end substance. Solution of dimethylamine in an aqueous solution of dimethyldithio-carbamate sodium at concentration 50-320 g/cm³ is used in the process. Sodium hydroxide is mixed with solution of dimethylamine in dimethyldithiocarbamate sodium and filtrate as solution of dimethyldithiocarbamate sodium at concentration 485 ± 10 g/cm³ is recovered to cycle for preparing solution of dimethylamine in dimethyldithiocarbamate sodium. EFFECT: increased content of main substance in end product, ready end product in crystalline form. 4 cl, 1 tbl, 3 ex