METHOD FOR PURIFICATION OF CHLOROFORM Russian patent published in 1997 - IPC

FIELD: chemical industry. SUBSTANCE: purification is carried out with the help of chemical oxidants, antimony pentoxide used as said oxidant. Purification is carried out preferably in rectification regime, purified product being isolated as light rectification fraction. Content of oxidant in vat liquid is maintained within 79-95 vol % range. Chlorinated impurities are accumulated in vat liquid which is periodically withdrawn to regenerate oxidant. Regeneration is carried out with the help of chlorine while distillation of chlorinated impurities takes place. Said chlorinated impurities are condensed and fed for fire disposal. Simultaneously purification of chloroform against carbon tetrachloride and drying take places. EFFECT: decreased exhaust of pollutants; improved efficiency. 7 cl, 2 tbl