Studies on the sulfonation reaction of a styrene-divinylbenzene copolymer for preparation a polymerization cation exchanger
Studies on the sulfonation reaction of a styrene-divinylbenzene copolymer
for preparation a polymerization cation exchanger
The laboratory-scale procedure of synthesis of the polymerization cation exchangers by sulfonation with gaseous SO2 of gel copolymers of styrene and divlnylbenzene has been optimized. A method of a preliminary preparation of copolymer, by swelling it in chloroform, as well as the most advantageous conditions of the sulfonation reaction (temperature and time of reaction, copolymer/chloroform weigth ratio) and of the after-sulfonation treatment of the cation exchange (washing first with methanol, then with water) have been established. The cation exchangers thus-repared exhibited a high total exchange capa city (4—4.9 milliequivalent per gram) and a low content of broken grains.
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