Synthesis of a sulfine cation exchanger from a porous sulfone styrene - divinylbenzene cation exchanger
A method of synthesis of a sulfine cation exchanger by chemical modification of the commercial macroporous cation exchanger on the basis of as tyrene-divinylbenzene copolymer (Wofatit KS-10) has been developed. The sulfone cation exchanger has been first chlorinated with a PCl3-POCl5 mixture and a copolymer with chlorosulfonyl functional groups has been obtained. This copolymer Has been reduced in an aqueous medium in the presence of Na2S, Na2S2, Na2SO3, Na2S2O3, Na2S2O4, Zn, Sn, SnCl2, as well as in ether medium in the presence of LiAlH4.The Best results have been obtained with the use of 3M aqueous solution of Na2S as a reducing agent at a temperature of 0°C. The product prepared under those conditions contained 3.0 mmole/g—SO2Na-groups (humidity of the product was equal to 13.5 %). A characteristic band at 980—940cm-1 was observed in the IR-spectrum of sulfine cation exchanger, due probably to the valence vibrations of the dissociated—SO2-group.
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