What is the national standard for the exchange capacity of cation exchange resins?
Generally, according to 900-1000mmol/L, there may be some users who have some difficulty understanding this "mole equivalent". Here's an example of softened water:Suppose the raw water hardness (as in calcium carbonate) is: 300 mg/LCation exchange resin exchange capacity: 900mmol/L
Calcium carbonate hardness concentration 300 / 1/2 calcium carbonate molecular weight 50 = 6 mol(take 1/2 calcium carbonate molecular weight, because the calcium ion is 2 valence, but soften the resin is to replace with 1 valence Na ion)
900 / 6 =150 cubic, that is, per cubic resin, can handle 150 tons of softened waterThe quality of all cation resin exchange capacity: more than 4.5mmol/gThe volume of total exchange capacity is more than 1.9mmol/ml