Purification of alkali metal chloride brines
AssigneeOlin Corporation
InventorsRonald L. Dotson, Richard W. Lynch
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Abstract
A method of purifying alkali metal chloride brine containing calcium ion impurities which comprises adding to the brine a proportion of an alkali metal carboxylate compound to form an insoluble calcium carboxylate precipitate, separating the insoluble carboxylate precipitate from the brine to purify the brine and recovering the resulting purified brine. The alkali metal carboxylate compound has the formula: ##STR1## wherein Me is an alkali metal and n is an integer from 0 to 6.
Claims8
A method of purifying alkali metal chloride brine containing calcium ion impurities for introduction into an electrolytic cell having an anolyte compartment separated from a catholyte compartment by a barrier which is a membrane, comprising the steps of:
- (a) adding to said brine a proportion of an alkali metal oxalate compound to form an insoluble calcium oxalate precipitate;
- (b) separating said insoluble oxalate precipitate from said brine to purify said brine;
- (c) recovering the resulting purified brine;
- and
- (d) contacting said purified brine with an ion exchange resin to further reduce the content of calcium ions in said purified brine.
Dependencies are inferred from the claim text.