METHOD FOR NEUTRALIZING HYPOCHLORITE CALCIUM PULP Russian patent published in 2017 - IPC C01F11/24 B01J38/60 C02F1/72 C01B11/06 C02F101/12 C02F103/18 

FIELD: chemistry.

SUBSTANCE: method involves thermal decomposition of calcium hypochlorite with stirring with hot steam in the presence of a nichrome catalyst treated in a pickling tank with a solution of hydrochloric acid. In the spent hydrochloric acid solution formed during the processing of the nichrome catalyst after its use in the process of thermal decomposition of calcium hypochlorite, the content of active chlorine is determined. When the spent hydrochloric acid solution is stirred, a solution of sodium thiosulfate is gradually added. The amount of sodium thiosulfate solution in the spent hydrochloric acid solution is maintained at 5-15 times excess from the stoichiometrically necessary one. The neutralized solution is drained into sewage.

EFFECT: reducing toxic substances and active chlorine in wastewater.

5 cl, 1 ex