The complex of programs for data handling of kinetics of ion exchange sorption

Abstract

The combihed mathematical model of ion exchange sorption, wkiich includes equations of saturation, formalistic kinetics aqd one of the.diffusion equations of h'eterophase, processes was suggested. On the basis of this model the tree-module program complex has been,devcloped. The first program module includes the equation of accumulation of sorbate subject to two kinds of sorption centers: intemal and extemal: Ones of them (extemal) are located on a surface and the others (intemal) are located inside of ionite granule pores. This equation allows to calculate some thermodynamic data. The second program module connects with searching kinetic equation based on the specific physical model of interaction a sorbate-ion with a ionite granule and allows to determine the diffusion model of sorption. nird~module determines the number of bonds of an absorbent-ion with a sorbent matrix. This approach was applied for the determination of regularities of sorption of rare-earth metal (REM) ions on ionites Kl3-2E and KBS. The basis of handling was experimental kinetics data of sorption of ions Nd'+ and Yb3+ by cations with different granulation and cross-linking. The form of the diffusion kinetic model (the second program module) demonstrated that the anti-Jander mechanism is realized for the most cases. The relation between antiJander constants and the nature of absorbent ions can be used for separation of the absorbent ions. The calculation of the reaction orders (n) demonstrated that values n did not depend.on the nature of an absorbent ion and the solution temperature.