Ion exchange equilibria in nonaqueous and mixed solvents on the cationic exchanger amberlite IR-120

Na+/K+ equilibrium ion exchange isotherms on Amberlite IR-120 (known as a s trong acid resin) in pure methanol, ethanol, 2-propanol, 1-butanol, and 1-p enthanol and in mixtures of methanol + water, ethanol + water, 2-propanol water, 1-butanol + methanol, and 1-penthanol + methanol at 313 K have been determined. Experimental equilibrium data have been satisfactorily correla ted using the homogeneous mass action law model (LAM). This model assumes n onideal behavior for both the solution and the solid phase. Wilson and Deby e-Huckel equations have been used to calculate activity coefficients in the solid and liquid phase, respectively. It has been observed that the dielec tric constant of the solvent or the mixture exerts a strong influence not o nly on the useful capacity of the resin but also on the equilibrium behavio r of the system.