| CPC B01J 47/016 (2017.01) [B01J 39/04 (2013.01); C07C 37/20 (2013.01); C07C 37/82 (2013.01); C07C 37/84 (2013.01); C07C 39/16 (2013.01)] | 13 Claims |
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1. A method of washing an ion exchange resin, the method comprising:
washing the ion exchange resin with deionized water (DI water) one or more times until a pH of the deionized water discharged after the washing is 6.2 to 7.0 to prepare a washed ion exchange resin; and
storing the washed ion exchange resin in the deionized water, wherein a temperature of the storing of the washed ion exchange resin is 50° C. to 60° C. and a time of the storing of the washed ion exchange resin is 6 hours to 20 hours, and an amount of the deionized water to which the washed ion exchange resin is added is at a weight ratio of 1.6 times to 1.8 times based on a weight of the ion exchange resin,
wherein the washing of the ion exchange resin and the storing of the washed ion exchange resin are performed repeatedly while replacing the deionized water until a concentration of an acidic effluent of the deionized water discharged immediately after the storing of the washed ion exchange resin is 0.5 ppm or less, and
wherein the acidic effluent includes at least one selected from the group consisting of sulfonic acid, phenol sulfonic acid, sulfobenzoic acid, formyl benzenesulfonic acid, acetyl benzenesulfonic acid, and a sulfonic acid group-containing organic acid.
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