Process for manufacture of calcium hypochlorite

Details Process for manufacture of calcium hypochlorite Process for manufacture of calcium hypochlorite

1975-01-06

1976-05-04

Stern, Edward

Chemistry of inorganic compounds

Halogen or compound thereof

Ternary compound

423163, 423473, 423499, C01B 1106

Patent

active

039549488

ABSTRACT:
A continuous process for the manufacture of calcium hypochlorite in which an aqueous slurry of lime and sodium hypochlorite is chlorinated in a mixing zone to form a sodium chloride solution containing large crystals of calcium hypochlorite which are readily separated and dried. The resulting solution containing some dissolved calcium hypochlorite is reacted with an alkali metal hydroxide to precipitate lime, which is separated and recycled to the mixing zone slurry. The lime-free solution may be used as bleach liquor or processed to precipitate solid salt useful in the preparation of brine. The remaining solution is recycled to the mixing zone slurry. Purification of fresh lime is also disclosed.
The process provides an improved separation of calcium hypochlorite and sodium chloride, and recycles all solutions to minimize pollution of water resources.

REFERENCES:
patent: 1713669 (1929-05-01), MacMullin et al.
patent: 1718285 (1929-06-01), George
patent: 1784286 (1930-12-01), Hershman
patent: 1931622 (1933-10-01), Reitz et al.
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patent: 3134641 (1964-05-01), Gleichert
patent: 3241912 (1966-03-01), Nicolaisen
patent: 3251647 (1966-05-01), Nicolaisen
patent: 3572989 (1971-03-01), Tatara et al.
patent: 3645005 (1972-02-01), Dychdala
patent: 3767775 (1973-10-01), Tatara et al.

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