Structural Characteristics

Modern ion-exchange materials are prepared from synthetic polymers such as styrene-divinyl-benzene copoly-mers that have been sulfonated to form strongly acidic cation exchangers or aminated to form strongly basic anion exchangers. Weakly basic anion exchangers are similar to the strong base except for the choice of amines.

Weakly acidic cation exchangers are usually prepared from cross-linked acrylic copolymers.

Figure 7.36.2 shows the reactions involved in the preparation of anion exchange resins. Figure 7.36.3 shows the reactions for cation exchange resins. Figure 7.36.4 shows the structure of a typical chelation resin.

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