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| Resins containing extractants have been used in analytical, hydrometallurgical and water processes. Gelled materials are very attractive materials for use in exchange processes in general and ion-exchange processes in particular. The efficacy of such gels is due to the fact that with such materials the exchange process takes place nearly in the entire volume of the gel, while in conventional exchangers the exchange process takes place only on a surface of the polymeric support due to slow diffusion of ions through the bulk. However, all the known gel-type materials have a relatively low chemical and physical stability and thus suffer from high extractant losses. Also, the technologies for their preparation are complicated and expensive. The present invention provides gelled materials comprising a chemically modified organic synthetic polymer and an extractant which overcome most of the drawbacks of known gelled materials, and methods for their preparation.the field organic synthetic polymers relates specifically gelled materials beads therefrom preparation characterized stability contact water solutions inorganic salts amino acids peptides proteins ion-exchange Resins extractants analytical hydrometallurgical impregnated resins two general approaches physical impregnation polymeric carrier yields solvent-impregnated polymerization copolymerization monomers cross-linking agent presence |
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