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Ion Exchange is the process of purifying a liquid solution by passing it through a bed of ion exchange resins. An exchange of ions between the liquid and the solid ion exchange resin takes place and is controlled by the functional group attached to the resin matrix. Cation resins have a negative fixed charge and exchange the positively charged ions; anion resins have a positive fixed charge and exchange the negatively charged ions [3]. The exchange of ions is reversible in most instances by passing a highly concentrated regenerator solution through the bed of ion exchange resin. |
