Study of Phenylalanine Sorption Kineticson Solvent Impregnated Resins, Part II.

In the present work the experimental kinetic data of amino acid reactive sorption on solvent impregnated resins (SIR) and its mathematical description is presented. L-Phenylalanine (L-Phe) is extracted from aqueous solution when impregnating the liquid ion-exchanger tricaprylylmethylammonium chloride (TCMAC) on XAD-resin. Experiments with different resins, ion-exchanger loadings, and L-Phe concentration were made for the determination of the rate controlling mechanism. The experimental results, confirmed by the analysis with the modified shrinking-core model, are in favor of a rate-determining intraparticle kinetics. With respect to its adequate description, three different models were considered. The first is based on Fick's diffusion law, the second one assumes the reaction as a rate determining step, and the third model is a combination of both. [ABSTRACT FROM AUTHOR]