Chemistry of inorganic compounds – Halogen or compound thereof – Ternary compound
Patent
1982-09-30
1983-11-22
Hearn, Brian E.
Chemistry of inorganic compounds
Halogen or compound thereof
Ternary compound
C01B 1106, C01F 1124
Patent
active
044168640
ABSTRACT:
A process for producing calcium hypochlorite from lime containing insoluble impurities comprises reacting the lime with an aqueous solution of hypochlorous acid to form a reaction mixture comprised of coarse dibasic calcium hypochlorite crystals and fine insolubles comprised of fine dibasic calcium hypochlorite crystals, insoluble impurities, and unreacted lime. Coarse dibasic calcium hypochlorite crystals are separated from the reaction mixture, leaving a slurry comprised of an aqueous calcium hypochlorite solution containing fine insolubles. The slurry of fine insolubles is separated and the resulting clarified aqueous calcium hypochlorite solution is used to wash occluded fine insolubles from the coarse dibasic crystals. The resulting wash solution is combined with fine insolubles and the resulting slurry is reacted with hypochlorous acid and filtered to remove insoluble lime impurities. The clarified solution is mixed with the washed coarse dibasic calcium hypochlorite crystals and then reacted with an aqueous solution of hypochlorous acid to produce hemibasic calcium hypochlorite. The resulting slurry is reacted with an alkali metal hydroxide and chlorine to form an aqueous paste of calcium hypochlorite dihydrate crystals. The paste is then dried to produce granular calcium hypochlorite by spray drying or spray graining. The hypochlorous acid is produced by reacting an aqueous solution of an alkali metal hydroxide in finely divided form with gaseous chlorine.
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Clements Donald F.
Haglind James B.
Hearn Brian E.
Olin Corporation
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