Calcium hypochlorite production from its dibasic salt

Details Calcium hypochlorite production from its dibasic salt Calcium hypochlorite production from its dibasic salt

1982-02-26

1983-01-04

Hearn, Brian E.

Chemistry of inorganic compounds

Halogen or compound thereof

Ternary compound

C01B 1106

Patent

active

043672094

ABSTRACT:
A process for producing neutral calcium hypochlorite which comprises reacting an aqueous slurry of lime containing insoluble impurities with chlorine to form a first slurry of dibasic calcium hypochlorite crystals and insoluble impurities. The insoluble impurities are separated from the first slurry by employing separation means for classifying solids with respect to particle size. Dibasic calcium hypochlorite crystals are then separated and admixed with an alkali metal hypochlorite and recycle dibasic calcium hypochlorite crystals to form a mixing zone slurry. This slurry is reacted with chlorine to form a paste of neutral calcium hypochlorite. The paste is separated into a cake of neutral calcium hypochlorite and a paste liquor and the cake of neutral calcium hypochlorite recovered. The paste liquor is reacted with lime to form a second slurry of dibasic calcium hypochlorite crystals which are separated from their mother liquor and returned to the mixing zone as recycle dibasic calcium hypochlorite.
The novel process can employ low quality lime as it effectively removes insoluble impurities. The process also efficiently recovers calcium and hypochlorite values from process streams.

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