Method for separating particulate calcium hypochlorite and sodiu

Details Method for separating particulate calcium hypochlorite and sodiu Method for separating particulate calcium hypochlorite and sodiu

1982-05-03

1984-01-31

Thomas, Earl C.

Chemistry of inorganic compounds

Halogen or compound thereof

Ternary compound

423499, C01B 1106

Patent

active

044289197

ABSTRACT:
Calcium hypochlorite particles and larger separable sodium chloride crystals produced in a process for manufacturing calcium hypochlorite are effectively separated by use of a staged upward-flow elutriator-classifier. In particular, an aqueous slurry of the calcium hypochlorite particles and sodium chloride crystals are introduced into about the midpoint of the classifier and elutriated with fluid substantially saturated in calcium hypochlorite and sodium chloride. A first slurry in which the solid phase is predominantly calcium hypochlorite, e.g., at least 95 weight percent, is removed as overflow from the top of the classifier, and a second slurry in which the solid phase is predominantly sodium chloride is removed as underflow from the bottom of the classifier.
In one embodiment, the first slurry is separated into a wet cake of calcium hypochlorite and bleach mother liquor, a portion of which liquor is used as elutriating fluid. The second slurry is separated into a wet cake of sodium chloride and salt mother liquor, which liquor is recycled to the bottom of the classifier. The wet cake of sodium chloride is washed with a fluid unsaturated in calcium hypochlorite and the washed sodium chloride recovered.

REFERENCES:
patent: 1937190 (1933-11-01), Chance
patent: 3237767 (1966-03-01), Fowle
patent: 3251647 (1966-05-01), Nicolaisen
patent: 3767775 (1973-10-01), Tatara et al.
patent: 3950499 (1976-04-01), Miyashin et al.
patent: 4258024 (1981-03-01), Hoffer et al.
patent: 4328200 (1982-05-01), Welch
Lauer, Chemical Engineering Techniques, Reinhold Pub. Corp., N.Y. (1952), pp. 146-149.

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