Thermodynamic Studies on Styrene Butadiene Phenolformaldehyde Cation Exchange Resin

Abstract

Equilibrium coefficients have been studied for the exchanges of

Cu(II)/H(I), Co(II)/H(I) and Ni(II)/H(I) systems on strongly cation

exchanger styrene butadiene phenolformaldehyde(SBPF) in aqueous and

aqueous-acetone media. The ionic strength of the solution was ≃0.1M,

and the exchanges was studied as a function of resin compositions. All

these coefficients increase with increasing organic solvent in the solution

phase. Applying a statistical thermodynamic model, the thermodynamic

equilibrium constants have been determined at three temperature range

between 25 and 55ºC. The standard free energies ΔGº, enthalpies ΔHº

and entropies ΔSº, drived from the data are presented.