The weakly basic anion exchange resins use either a polystyrene or polyacrylic ester frame and a primary-ternary amino group as the functional group.
Resins using the primary-ternary amino groups as functional groups behave like weak bases and are therefore called weakly basic anion exchange resin.
Because the weakly basic anion exchange resin has a weakly alkaline functional group, in basic solution it does not dissociate and therefore has no ion exchange ability.
Although the anion of a salt like NaCl or Na2SO4 cannot be exchanged, the anion of a mineral acid such as HCl and H2SO4, or the salt of a weak base like NH44Cl can be carried out as shown in the reactions below.
R-NH2＋HCl → R-NH3Cl
R-NH2＋NH4Cl → R-NH3Cl＋NH3
Weak acid is generally hard to capture, and although there is a resin with which H2CO3 is exchangeable, silicic acid (silica) cannot be exchanged.
An advantage of the weakly basic resin is that it is easy to regenerate. Of course NaOH, but even Na2CO3, NH3, etc. can be used for regeneration. And this regeneration is economical as only slightly more than the theoretical chemical equivalent amount of regenerant solution is required.
Applications include water treatment as well as purification of pharmaceuticals and food.
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