A computer description of the dynamic behavior of multicomponent nonlinearion-exchange systems based on the model of formation of surface complexes

The dynamic behavior of multicomponent ion-exchange systems is described by solving kinetic and dynamic partial differential material balance equation s. In the dynamic problem, multicomponent ion-exchange equilibria are treat ed in terms of the theory of formation of surface complexes. It is assumed that fixed ionite groups and counterions of each kind form complexes situat ed in various layers (Stern layers) at various distances near the surface; the layers act as capacitors connected in series (it is important that mult icomponent equilibria can be predicted from parameter sets for binary excha nge reactions). The results of computations are compared with some analytic solutions obtained for binary, ternary, and quaternary ion-exchange system s A/B/C/E. Numerical and analytic solutions are compared for frontal-exclus ion chromatograms obtained under stationary conditions. The accuracy of com puter descriptions of the dynamics of multicomponent systems is shown to be high.