Anion exchange resin

Anion exchange resin

In 1935, the British chemists Adams and Holmes prepared the polyaniline-aldehyde weakly basic anion exchange resin through the polycondensation reaction of m-phenylenediamine and formaldehyde , that is, amine solution and twice the amount of hydrochloric acid Mix, then mix with excess formaldehyde solution, heat at 90～95℃ for 1.

In 1944, American Del Leo synthesized a styrene-based ion exchange resin.

Anion exchange resins can be divided into two types according to the nature of the exchange groups they contain: strongly basic anion exchange resins and weakly basic anion exchange resins

(1) Strongly basic anion exchange resin

The ion exchange resin with quaternary ammonium group as the exchange group dissociates in water as follows:

Commonly used anion exchange resins are made from styrene-divinylbenzene copolymer microspheres through chloromethylation and then aminating

(2) Weakly basic resin

Ion exchange resin with primary or secondary amine or tertiary amine as the exchange group

Related link: Weakly acidic polycondensation type cation exchange resin