МЕМБРАНЫ И МЕМБРАННАЯ ТЕХНОЛОГИЯ УДК 661.183.123 CHARACTERIZATION OF ION-EXCHANGE RESINS UNDER THERMAL LOADING ELIŠKA STRБNSKБ, MemBrain s.r.o., (Pod Vinic� 87, 471 27 Strбž pod Ralskem, Czech Republic) JANA MACHOTOVБ, Institute of Chemistry and Technology of Macromolecular Materials, Faculty of Chemical Technology, University of Pardubice (Studentskб 573, 532 10 Pardubice, Czech Republic) LUCIE ZБRYBNICKБ, Institute of Chemistry and Technology of Macromolecular Materials, Faculty of Chemical Technology, University of Pardubice (Studentskб 573, 532 10 Pardubice, Czech Republic) EVA ČERNOŠKOVБ, Joint Laboratory of Solid State Chemistry of the Institute of Macromolecular Chemistry of AS CR and University of Pardubice, Faculty of Chemical Technology, University of Pardubice (Studentskб 573, 532 10 Pardubice, Czech Republic) KLБRA MELБNOVБ, Institute of Macromolecular Chemistry AS CR (Heyrovskйhonбm 2, 162 06 Praha) E-mail: zarybnicka.l@email.cz ABSTRACT. <...> Technological operations running at elevated temperatures (drying, homogenization) can influence the lead or ion-exchange capability of ion-exchangers, which may affect values of the ion-exchange capacity. <...> Several types of anion and cation-exchangers have been chosen for its application in practice. <...> Samples of selected ion-exchangers were subjected to thermal stress in the temperature range of 75-160°C at different times of exposure. <...> It was shown that the optimum processing temperature for anion and cation-exchange resins is in the range of 105-115°C. <...> INTRODUCTION Porous types of ion-exchange resins are used in membrane processes such as ultrafiltration, nanofiltration or microfiltration. <...> Anion-exchange resin is a high molecular substance (e.g. on the basis of copolymer of styrene-divinyl benzene (S-DVB) or polyacrylate) whose molecule contains functional groups capable of dissociation in an aqueous medium. <...> Ion-exchange resins can be divided into anion resins (anion-exchange resin) and cation resins (cation-exchange resin) and am pholytic ion exchange-resins, which are able to exchange both anions and cations [2, 3]. <...> Anion-exchange resins themselves can be strongly basic, if the functional group is a quaternary ammonium group on the surface of copolymer. <...> During the preparation of anion-exchange membrane, ion-exchange resins pass through a number of technological operations during which their resins are thermally loaded <...>