The experimental investigation of the ion transfer phenomena of the ion-exchange resin

Ion exchange rate could be controlled by transfer in the liquid surrounding the exchanger particles, diffusion within the resin exchanger particles or chemical exchange reaction at the active sites. The goal of this study is to identify the fixed-bed column characteristics and ion exchange characteristics of searching for the optimal operation condition using breakthrough times in effectively eliminating NH₄ ion, one of ions causing problems in fields of production separation. Therefore, it was determined the ion exchange equilibrium relationship of the NH₄ using the agitated batch system experiments, and then. estimated each of the variable parameters, and also finally evaluated ion exchange mechanism. As a result, it was found that the ion exchange relationship. determined from the dynamic characteristics of NH₄ ion using cation exchange resin (DIAION SK-1B). From the results of estimating the internal-diffusion coefficient through agitated batch system experiments, it was found that the internal-diffusion coefficient increases with higher initial concentrations, smaller particle sizes, and higher experimental temperatures, and that the value of internal-diffusion coefficient is obtained at constant temperature of 30°C.