ION-EXCHANGE EQUILIBRIA OF DL-LYSINE MONOHYDROCHLORIDE ON AMBERLITE IRA-420

Ion exchange equilibria of DL-lysine monohydrochloride on Amberlite IR A-420 were studied at 293, 303 and 313 K and different ion concentrati ons. A model which accounts for the non ideal behaviour of the differe nt species involved in both liquid phase and resin phase was developed from a general model based on the mass action law. Activity coefficie nts of this model were calculated using Wilson and extended Debye-Huck el equations. A method based on the statistical significance of both t he model and its characteristic parameters was used to evaluate their validity. The deviation between the values calculated by this model an d the experimental data was less than 8%. Finally, the standard thermo dynamic properties, Delta G degrees, Delta H degrees and Delta S degre es were determined taking into account the values of the thermodynamic constant at different temperatures.