METHOD FOR PRODUCTION OF CONCENTRATED SOLUTION OF HYPOCHLOROUS ACID Russian patent published in 1997 - IPC

FIELD: production of concentrated solutions of hypochlorous acid which are used as whitening agent and as reagent for production of chloroamines and chlorohydrines. SUBSTANCE: method involves interaction of solution of hydroxide of alkaline metal having concentration more 50 mass % with gaseous chlorine, said solution being used as drops. Thus prepared gaseous mixture comprises chlorine oxide, chlorine, steam of hypochlorous acid, water vapor and solid particles of alkaline metal. Solid particles of alkaline metal chloride are separated and gaseous mixture is condensed at temperature from -33 C to -5 C to prepare highly pure solution of hypochlorous acid having concentration 50-60 mass % and non-condensed mixture comprising chlorine and dichloroxide. Then separation is carried out. EFFECT: improved efficiency of the method. 7 cl, 3 dwg