Ion exchange resin is a kind of polymer compound with functional base mesh structure, which is composed of insoluble three-dimensional spatial mesh skeleton, functional group connected to skeleton and interchangeable ion with opposite charge on functional group.

Ion exchange resins can be divided into cationic exchange resins, anionic exchange resin and amphoteric ion exchange resins

Ion exchange resins are insoluble in water and general solvents. Most are granular, and some are made fibrous or powdery.

The size of the resin particles is generally within the 0.3~1.2mm range, mostly between 0.4~0.6mm.

They have high mechanical strength (fastness properties) and are chemically stable, with a long service life under normal conditions.

According to the chemical active groups are first divided into cationic resin and anionic resin two categories.

Cationic resins are divided into two categories, strong acidic and weak acidic.

Working principle of ion exchange resin In the ion exchange process, the cations in the water (such as Na+, Ca2+, K+, Mg2+, Fe3+, etc.) are exchanged with the H+ on the cationic exchange resin, and the cations in the water are transferred to the resin, while the H+ on the resin are exchanged into the water. The anions in the water (such as Cl-, HCO3-, etc.) are exchanged with the OH-on the anion exchange resin, and the anions in the water are transferred to the resin, while the OH-on the resin is exchanged into the water. And the combination of H+ and OH-to produce water, so as to achieve the goal of desalination.