P.U. Singare, A.N. Patange, Ion-Exchange Reaction Thermodynamics to Study the Selectivity Behaviour of Nuclear and Non-Nuclear Grade Anion Exchange Resins, ILCPA Volume 25, International Letters of Chemistry, Physics and Astronomy (Volume 25)
https://www.scipress.com/ILCPA.25.8
Abstract:
    In the present investigation, attempts were made to understand the difference in bromide ion selectivity of the two closely related anion exchange resins Auchlite ARA-9366 and Auchlite A-378 in chloride form. The selectivity difference was predicted based on the thermodynamic equilibrium constants and enthalpy values of Clˉ/Brˉ<sup> </sup> ion exchange reactions performed by using the two resins. During Clˉ/Brˉ exchange reactions, with rise in temperature from 30.0<sup> </sup>°C to 45.0 °C, the equilibrium constant (<i>K</i>) values were observed to decreases from 8.15x10<sup>-2</sup> to 6.06x10<sup>-2</sup> for Auchlite ARA-9366 resins and from 2.16x10<sup>-2</sup> to 1.10x10<sup>-2</sup> for Auchlite A-378 resins. The decrease in <i>K</i> values with rise in temperature, indicate exothermic ion exchange reactions having enthalpy values of -36.14 and -18.38 kJ/mol respectively. The high <i>K</i> and low enthalpy values obtained for Auchlite ARA-9366 resins indicate their greater selectivity for the bromide ions in the solution as compared to Auchlite A-378 resins.
Keywords:
    Auchlite A-378, Auchlite ARA-9366, Enthalpy, Ionic Selectivity, Nuclear Grade Ion Exchange Resin, Thermodynamic Equilibrium Constant, Uni-Univalent Exchange