Chemistry of inorganic compounds – Halogen or compound thereof – Ternary compound
Patent
1982-02-04
1983-08-16
Hearn, Brian E.
Chemistry of inorganic compounds
Halogen or compound thereof
Ternary compound
C01B 1106
Patent
active
043991173
ABSTRACT:
A process for producing neutral calcium hypochlorite comprises admixing lime, an alkali metal hypochlorite and dibasic calcium hypochlorite crystals in a mixing zone slurry. The mixing zone slurry is reacted with chlorine to form a paste of neutral calcium hypochlorite. The paste is then separated into a cake of neutral calcium hypochlorite and a paste liquor. A slurry of lime is fed to a crystallizer to react with the paste liquor to form a slurry of dibasic calcium hypochlorite crystals in a mother liquor. Crystals of dibasic calcium hypochlorite are then separated from the dibasic mother liquor and recycled to the mixing zone. The process of the present invention provides an efficient method of recovering calcium hypochlorite values from process liquors while reducing energy costs expended in the recovery. The process further provides rapid recovery of dibasic calcium hypochlorite for reuse in a neutral calcium hypochlorite process by optimizing separation rates.
REFERENCES:
patent: 1583421 (1926-05-01), Pistol
patent: 2368042 (1945-01-01), Robson
patent: 3950499 (1976-04-01), Miyashin
patent: 3956471 (1976-05-01), Pullman
Clements Donald F.
Haglind James B.
Hearn Brian E.
Olin Corporation
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