Process for the removal of cations of an alkaline earth metal sp

Details Process for the removal of cations of an alkaline earth metal sp Process for the removal of cations of an alkaline earth metal sp

1988-04-11

1990-01-16

Cintins, Ivars

Liquid purification or separation

Processes

Ion exchange or selective sorption

210687, 521 26, B01J 4900, C02F 142

Patent

active

048941689

ABSTRACT:
A process for removing cations of a first alkaline earth metal species from an aqueous solution with an ion exchanger material that is a cation exchanger or contains one and subsequently regenerating the loaded or exhausted ion exchanger material. A cation exchanger that has been loaded in advance with cations of a second alkaline earth metal species is used to remove the cations of the first alkaline earth metal species. The cation exchanger that is loaded or exhausted with the first species to be removed is regenerated by bringing the loaded or exhausted cation exchanger into contact with an aqueous suspension of a slightly soluble carbonate and/or hydroxide of the second alkaline earth metal species, either alone or in a mixture with an anion exchanger, and introducing a CO.sub.2 -containing gas into the suspension.

REFERENCES:
patent: 2227520 (1941-01-01), Tiger
patent: 3589999 (1971-06-01), McRae et al.
patent: 4299922 (1981-11-01), Holl et al.
patent: 4448693 (1984-05-01), Kiehling et al.

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