A Kinetic Model for Cationic-Exchange-Resin Regeneration

Ion exchange accompanied by neutralization in an anion bed

“…The continuity equations for anionic species Cl − and SO 4 2− , after neglecting axial dispersion terms, are…”

“…For the ternary SO 4 2− -Cl − -OH − exchange system, the equilibrium relations are obtained from the relations defined for binary Cl − -OH − and SO 4 2− -OH − . We have…”

“…If needed, the numerical algorithms can be modified to take account of variable feed and non-uniform pre-saturation which are likely to occur in a cyclic process. The present experimental work covered Cl − -OH − , SO 4 2− -OH − and SO 4 2− -Cl − -OH − exchange. The ion exchange in these three systems is accompanied by a neutralization reaction.…”

“…Thus, the charge balance and the dissociation expression for water are also incorporated in the simulation calculation. The computations for the binary system of Cl − -OH − and SO 4 2− -OH − are easier to perform compared to the simulation for the ternary system. In the simulation for the ternary system, it is assumed that feed contains chloride and sulfate ions while the resin bed is initially in OH − form.…”

“…Recent studies have been focused on the production of ultrapure water by ion exchange process [1,2]. Deionized water is produced using either a mixed-bed or a two-bed ion exchange system [3][4][5][6][7][8][9][10]. In the later configuration, the effluent from the cation bed is essentially a mixture of dilute acids.…”