Process for the recovery of calcium chloride from calcium hypoch

Details Process for the recovery of calcium chloride from calcium hypoch Process for the recovery of calcium chloride from calcium hypoch

1981-05-04

1982-09-07

Thomas, Earl C.

Chemistry of inorganic compounds

Halogen or compound thereof

Binary compound containing metal

23304, C01F 1124

Patent

active

043483720

ABSTRACT:
Calcium chloride hydrates are recovered from calcium hypochlorite process effluents comprised of an aqueous solution of calcium chloride, calcium hypochlorite, and calcium chlorate in a process which comprises acidifying the effluent with a chlorine-containing compound selected from the group consisting of chlorine, hydrochloric acid and hydrogen chloride to form an acidic aqueous solution of calcium chloride having reduced concentrations of calcium hypochlorite. Water is evaporated from the acidic aqueous solution to produce a concentrated acidic aqueous solution containing at least 45 percent by weight of calcium chloride. The concentrated acidic aqueous solution of calcium chloride is fed to a crystallizer to form crystals of a calcium chloride hydrate. The calcium chloride hydrate crystals are separated from a mother liquor and recovered.
The process is used to produce calcium chloride hexahydrate, calcium chloride tetrahydrate or calcium chloride dihydrate.

REFERENCES:
patent: 1922697 (1933-08-01), Heath
patent: 3030177 (1962-04-01), Mohan, Jr.
Chemical Abstracts 73, 132608w (1970), H. Yamashita et al., Japan 70 28,287, Sep. 16, 1970.
Kirk-Othmer, Encyclopedia of Chemical Technology--3rd edition vol. 4, pp. 432-434, N.Y., Wiley--1978.

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