According to the "The Structure of Ion Exchange Resin " section, the functional group of the resin determines the properties and uses of the resin, so the classification of the resin and the functional groups are classified:
1、Strong acid cation exchange resin SAC
SAC is capable of dissociating H+ and exhibit strong acidity, could be cation exchanged at any pH, and regenerated with acid.
2、Weak acid cation exchange resin WAC
- carboxyl -COOH
WAC is capable of dissociating H+ and exhibit weak acidity. It can be cation exchanged in alkaline, neutral or slightly acid solutions，and generally regenerated with acid.
3、Strong base anion exchange resin SBA
- quaternary ammonium-NR3OH
SBA is highly alkaline due to dissociation OH- in water. It can be anion exchanged at any pH, and are typically regenerated with NaOH.
4、Weak base anion exchange resin WBA
- primary amine-NH2，secondary amine-NHR,Tertiary amine-NR2
WBA can dissociate OH- in water and shows weak alkaline, only work under neutral or acidic conditions (pH 1-9). They are generally used to remove the acid molecules in solution，and regenerated with Na2CO3, NH4OH.
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