Exchange capacity of the resin is an ion exchange resin exchange capacity under certain operating conditions has, generally refers to the unit volume of wet resin material can ion exchange capacity, units to mmol / g, mol / m3 or mmol / L represents. Resin exchange capacity is not only affected by the resin structure is also affected by the solution composition, flow rate, temperature, exchange control, and the end of the regenerated catalyst and regeneration conditions and other factors, and therefore the resin exchange capacity is the actual exchange capacity ion exchange resins It measures.