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Abstract
Liquid surfactant membranes, noted as a novel separation technique, have potential applications in many fields, especially in extractive metallurgy. High separation efficiency with the membranes can be achieved by using type I and type II facilitated transport mechanisms to maximize both the flux through the membranes and the capacity of the internal receiving phase for the diffusing species. Mass transfer models for both facilitated transport mechanisms are developed by taking into account the mass transfer and the reactions both inside and outside the emulsion globules, and perturbation solutions to the resulting nonlinear equations are presented. A Carrier Facilitated Transport Factor, defined as the ratio of the extraction rate constant for type II facilitation to that of type I facilitation, is proposed to account for the effect of carriers in the membrane on the extraction rate. Model predictions are in good agreement with the experimental data on batch extraction of acetic acid and auric chloride from their respective aqueous solutions.