Process for reducing calcium ion concentrations in alkaline alka

Details Process for reducing calcium ion concentrations in alkaline alka Process for reducing calcium ion concentrations in alkaline alka

1979-08-20

1981-07-07

Castel, Benoit

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkaline earth metal

210702, 423186, 204 98, C01F 1118

Patent

active

042774470

ABSTRACT:
A process for reducing calcium ion concentration in alkaline alkali metal chloride brines containing an alkali metal hydroxide is disclosed. The process comprises admixing an alkali metal bicarbonate with the alkaline brines to form an insoluble calcium salt, removing the insoluble calcium salt from the brine, and recovering a purified alkali metal chloride brine having reduced calcium ion concentration.
The process produces alkali metal chloride brines suitable for use in electrolytic diaphragm cells while substantially reducing the amount of acid required to neutralize the brines.

REFERENCES:
patent: Re1290 (1862-03-01), Spencer
patent: 33424 (1861-10-01), Barker et al.
patent: 273256 (1883-03-01), Catlin
patent: 1500126 (1924-07-01), Hanson et al.
patent: 4038365 (1977-07-01), Patil et al.
patent: 4115219 (1978-09-01), Gancy et al.
patent: 4155820 (1979-05-01), Ogawa et al.

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