Method for removing magnesium and calcium from sodium sulfate so

Details Method for removing magnesium and calcium from sodium sulfate so Method for removing magnesium and calcium from sodium sulfate so

1990-04-04

1990-10-30

Cintins, Ivars

Liquid purification or separation

Processes

Ion exchange or selective sorption

210669, 210687, 432157, 432164, 432181, B01D 1504

Patent

active

049667106

ABSTRACT:
A method for removing magnesium and calcium from sodium sulfate solutions to render the solutions suitable for membrane processing, which comprises adjusting the pH of the solutions to about 11 to 13 with sodium hydroxide to form a precipitate containing the bulk of the magnesium and the calcium, removing the precipitate from the resulting partially purified sodium sulfate solution, and contacting the partially purified sodium sulfate solution with a polystyrene divinyl benzene copolymer chelating cation exchange resin having an aminophosphonic functional group and having sodium as the exchangeable cation, to remove essentially all of the magnesium and the calcium from the partially purified sodium sulfate solution.

REFERENCES:
patent: 4060465 (1977-11-01), Yokota et al.
patent: 4855059 (1989-08-01), Frianeza-Kullberg

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