Binary ion exchange equilibrium for Ca²⁺, Mg²⁺, K⁺, Na⁺ and H⁺ ions on amberlite IR‐120

Abstract

Experimental data are reported for ion exchange equilibria of binary systems on Amberlite IR-120 resin, at different temperatures and total ionic concentrations in aqueous solutions. These systems exhibit non-ideal behaviour in both phases, and the equilibrium characterization has been based on the law of mass action, using Wilson and Meissner, and Kusik equations to correlate the activity coefficients in the resin and aqueous solutions, respectively. Equilibrium constants, standard thermodynamic properties (Gibbs free enthalpy changes, enthalpy and entropy) and Wilson binary parameters were obtained as functions of temperature.

A New Model for the Simulation of Ion Exchange Equilibria

“…Figure 2. Comparison between calculated results of both IMAM and HMAM and experimental values (de Lucas Martinez et al, 1993) of the ionic fraction in the resin phase as a function of the ionic fraction in the solution phase for the ion exchange equilibrium K+/H+.…”

“…For this they estimated the six binary interaction parameters of the Wilson model, using the experimental data relative to the corresponding three binary systems. A similar model has been used by de Lucas Martinez et al (1992Martinez et al ( , 1993 for various binary and multicomponent systems on Amberlite IR-120, involving the ions H+, Na+, K+, Ca2+, and Mg2+. A method to reduce the number of model parameters has been developed by Allen et al (1989) and Allen and Addison (1990) by forcing the Wilson parameters to satisfy some constraints based on empirical relationships.…”

Ion-Exchange Equilibria for Au(CN)2-/Cl-, Au(CN)2-/SCN-, and SCN-/Cl- in Aqueous Solution at 303 K

“…A similar range of values for the Wilson parameters has been reported for cation-exchange systems. [15][16][17] In the two-parameter regression, the optimization routine yielded some slightly negative values for the Wilson parameters, even though positive values are required to maintain consistency with the Wilson model. Allen et al 19 have noted that the product of the two parameters is approximately equal to unity for a range of binary systems.…”

“…14 This method has been applied successfully in the correlation of binary ion-exchange equilibria for cationic systems. [15][16][17] The relevant equations for the exchange of ions A and B are where Λ AB and Λ BA are the Wilson parameters.…”

“…The individual ionic activity coefficients in the resin phase were also calculated using a semiempirical approach involving the Wilson equations formulated for vapor−liquid equilibria . This method has been applied successfully in the correlation of binary ion-exchange equilibria for cationic systems. − The relevant equations for the exchange of ions A and B are where Λ AB and Λ BA are the Wilson parameters.…”