| 摘要 |
PROBLEM TO BE SOLVED: To provide a purification process of an ionic polymer compound wherein low molecular weight impurities charged with the same signs as the ionic polymer compound such as ionic residual monomers or the like are efficiently removed from the ionic polymer compound in a shorter time. SOLUTION: This process comprises steps wherein (A) an aqueous solution containing an ionic polymer compound and low molecular weight impurities charged with the same signs as the ionic polymer compound such as ionic residual monomers or the like is treated with an ultrafilter membrane and/or reverse osmosis membrane under conditions wherein the concentration of the ionic polymer compound is 7 to 20 wt.% and the electric charge of the ionic polymer compound in the aqueous solution is 0.30 g equiv./L or larger, to remove the low molecular weight impurities and to obtain a membrane-separated solution, (B) the membrane-separated solution obtained through the process (A) is brought into contact with activated carbon, and then the activated carbon is separated to obtain an activated carbon-treated solution and (C) the activated carbon- treated solution obtained through the process (B) is brought into contact with an ion-exchange resin.
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