Patent ID: 9242875
Filing Date: 2016-01-26
CPC Classification: B01J,C02F

Claim Text:
1. A method of removing calcium from a solution containing potassium or/and sodium, and calcium using water and an ion-exchange resin to separate said solution containing potassium or/and sodium, and calcium into a solution containing potassium or/and the sodium and a solution containing calcium, wherein the method comprises the steps of: (a) providing an amphoteric ion-exchange resin filled up with said water; (b) introducing the solution containing potassium or/and sodium, and calcium into the amphoteric ion-exchange resin; (c) introducing said water for regenerating the amphoteric ion-exchange resin; (d) discharging the solution containing potassium or/and sodium from the amphoteric ion-exchange resin; (e) discharging the solution containing calcium from the amphoteric ion-exchange resin separate from the discharging in step (d) so as to separate the solution containing potassium or/and sodium from the solution containing calcium; and (f) repeating steps (b) to (e).