Principle of ion exchange resin desalination
The desalination principle of ion exchange resin is the process in which the ion exchange resin separates the salt from the solution: the metal cations (Na+, Ca2+, K+, Mg2+, Fe3+, etc.) contained in the aqueous solution in the action environment of the ion exchange resin are exchanged with the H+on the cation exchange resin (containing acidic groups such as sulfonic acid group (- SO3H), carboxylic group (- COOH) or phenol group (- C6H4OH), which are easy to generate H+ions in the water), The cation in the solution is transferred to the resin, and the H+on the resin is exchanged to the water (i.e. the principle of cation exchange resin). Anions (Cl -, HCO3 -, etc.) in the aqueous solution exchange with OH - on the anion exchange resin (containing quaternary amino [- N (CH3) 3OH], amino (- NH2) or imino (- NH2) and other basic groups, which are easy to generate OH - ions in water). Anions in the water are transferred to the resin, while OH - on the resin is exchanged to the water, (i.e. the principle of anion exchange resin). The combination of H+and OH - generates water to achieve desalination.
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