Dual-temperature reagent-less ion-exchange separations of alkali metal salts on zeolitesстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Ion exchange equilibria in the mixed K2SO4 - Na2SO4 and CsCl – NaCl solutions with concentrations within the range of 2.2 to 2.9 equiv/l on the natural clinoptilolites have been studied. The equilibrium coefficients for the Na+ - K+ and Na+ - Cs+ exchanges on clinoptilolite decreased significantly with temperature when the equivalent fractions of K+ and Cs+ ions in the zeolite phase were very low. Accordingly, the differential enthalpy of ion exchange increased with a decrease of equivalent fractions of these ions in the zeolite phase. Dual-temperature ion-exchange separations and purifications of concentrated solutions of alkali metal salts on natural clinoptilolites and synthetic Y type zeolite without auxiliary reagents consumption were studied. Two types of dual-temperature techniques were used: the temperature-swing mode of separation and the parametric pumping.