UNSTEADY PROCESSES OF ION EXCHANGE SORPTION OF ZINC IONS IN A DENSE MOVING ION EXCHANGER BED APPARATUS

The article is devoted to the study of processes of ion-exchange sorption of zinc ions in a dense moving ion exchanger bed apparatus. A mathematical description of the ion exchange process is proposed, taking into account the following simplifying assumptions: the process equilibrium is described by the Nikolskogo adsorption isotherm equation; the rate of ion exchange is limited internal diffusion; the structure of the movement of the solution and the ion exchanger in the apparatus is described by the ideal displacement model. In accordance with the accepted assumptions, a mathematical description of the process is formulated, including the material balance equations forAa solution, the equation of the adsorption isotherm, the equation of diffusion kinetics, as well as the initial and boundary conditions. The solution of the problem is carried a piecewiseiteration method. To test the adequacy of the developed model to the real process, experimental studies of processes of ion-exchange sorption of heavy metal ions on the & Kcy;& Ucy;-2-8 sulfonic acid cation exchanger in a laboratory dense moving ion exchanger bed apparatus. The concentration of the initial solution increased linearly. During the research, curves of changes in solution concentration along the height of the apparatus and output ion exchange curves were taken. Comparison of the results of calculation and experiment made it possible to conclude that the developed mathematical description is adequate to the real process. The discrepancy between the calculation and the experiment does not exceed 12%. Recommendations are given on the application of the obtained dependences for practical application.