C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/140
C01B 11/06 (2006.01)
Patent
CA 1075436
ABSTRACT OF THE DISCLOSURE The present invention describes a solid calcium hypochlorite composition comprising calcium hypochlorite and about 0.5% to about 50% by weight of substantially water- insoluble and unchlorinated magnesium compounds, said magnesium compounds being derived from impure hydrated lime. Furthermore, the present invention describes a process for making this composition, which is an improvement in the known process for the manufacture of a solid calcium hypochlorite composition wherein an aqueous slurry comprising a hydrated lime, a mixture of hydrated lime and at least one alkali metal hydroxide, or a mixture of hydrated lime and at least one alkali metal hypochlorite, is chlorinated to form an aqueous chlorinated slurry containing calcium hypochlorite and further processsing said chlorinated slurry to recover a solid calcium hypochlorite composition, said improvement comprising: (a) employing a hydrated lime containing from about 97% to about 50% by weight calcium hydroxide and more than about 0.5% by weight magnesium based on the total dry weight of said hydrated lime, (b) terminating said chlorination reaction when from about 75% to about 99.5% by weight of said calcium hydroxide is chlorinated and from 0% to about 5% by weight of said magensium is chlorinated to form an aqueous chlorinated slurry of substantially water- insoluble and unchlorinated magnesium compounds and calcium hypochlorite, and (c) further processing said chlorinated slurry to recover a solid calcium hypochlorite composition having admixed therein said substantially water-insoluble and unchlorinated magnesium compounds, said magnesium compounds being derived from impure hydrated lime. -2-
293455
Farmer Douglas A. (jr.)
Wojtowicz John A.
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