Removal of part per billion level hardness impurities from alkal

Details Removal of part per billion level hardness impurities from alkal Removal of part per billion level hardness impurities from alkal

1978-04-27

1979-11-27

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

204128, 423300, 423301, 423305, 423158, C25B 116, C25B 126, C01F 2532

Patent

active

041760220

ABSTRACT:
Disclosed is a method of electrolyzing an alkali metal chloride brine in an electrolytic cell by feeding an aqueous alkali metal chloride brine containing less than 20 parts per billion dissolved alkaline earth metal ions, e.g., calcium, to the anolyte compartment of an electrolytic cell. Also disclosed is an alkali metal chloride brine containing less than 20 parts per billion of alkaline earth metal ions, e.g., calcium ion. There is also disclosed a method of purifying alkaline earth metal-containing brines, e.g., calcium-containing brines, by maintaining the brine alkaline, adding a phosphate to the alkaline brine whereby to form a calcium compound substantially insoluble in brine and thereafter separating the compound from the brine.

REFERENCES:
patent: 3163599 (1964-12-01), Salutsky et al.
patent: 3793163 (1974-02-01), Dotson
patent: 4038365 (1977-07-01), Patil et al.

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