Mg²⁺/NH₄⁺ Ion Exchange Kinetics under Isothermal Supersaturated Conditions

M. Ortueta Department of Chemical Engineering, Faculty of Science and Technology, University of the Basque Country, P.O Box 644, 48080 Bilbao, Spain Phone: +34 94 601 2620 E-mail: [email protected].Correspondence[email protected]

A. Celaya Department of Chemical Engineering, Faculty of Science and Technology, University of the Basque Country, P.O Box 644, 48080 Bilbao, Spain Phone: +34 94 601 2620 E-mail: [email protected].

F. Mijangos Department of Chemical Engineering, Faculty of Science and Technology, University of the Basque Country, P.O Box 644, 48080 Bilbao, Spain Phone: +34 94 601 2620 E-mail: [email protected].

D. Muraviev Department of Analytical Chemistry, Autonomous University of Barcelona, 08193 Bellaterra, Barcelona, Spain

Abstract

Ion Exchange Isothermal Supersaturation process (IXISS) allows the recovery of the salt from the elution solution without any additional reagent or step. This work focuses on the batch elution kinetics of magnesium with ammonium from two commercial resins under supersaturated conditions – i.e., conditions far above from the solubility of magnesium. The Mg²⁺/NH₄ ⁺ exchange was measured by chemical analysis and the salt crystallization was monitored by the turbidity of the solution. The stability of the supersaturated solution was evaluated as a function of the functional group and matrix type of the ion exchanger. The effective diffusion coefficients were calculated by fitting the experimental data to the unreacted core model. The values calculated were dependent on the stability of the intraparticular solution.

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Mg²⁺/NH₄⁺ Ion Exchange Kinetics under Isothermal Supersaturated Conditions

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Mg²⁺/NH₄⁺ Ion Exchange Kinetics under Isothermal Supersaturated Conditions