Mathematical modeling of silver extraction by an emulsion liquid membrane process |
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| Authors: | Sang Cheol Lee Byoung Sung Ahn Won Kook Lee |
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| Institution: | 1. Department of Chemical Engineering, Kunsan National University, Kunsan, Chonbuk 573–701, South Korea;2. Division of Environmental and CFC Technology, Korea Institute of Science and Technology Cheongryang, P.O. Box 131, Seoul, South Korea;3. Department of Chemical Engineering, Korea Advanced Institute of Science and Technology 373-1, Kusong Dong, Yusung Gu, Taejeon, South Korea |
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| Abstract: | A general physical model of a typical batch extraction system employing an emulsion liquid membrane process for the extraction of silver has been developed. The model takes into account the extraction reaction between the silver ion and the carrier molecules at the external interface, the diffusion of the complex in the membrane phase, the stripping reaction at the internal interface and the reaction of silver ion with the reagent, HCL, in the internal phase to yield silver chloride incapable of permeating through the membrane phase. In addition, the leakage of the internal aqueous phase to the external aqueous phase due to membrane breakage has been incorporated in this model. The batch extraction of silver using D2EHPA as a carrier has been carried out under various experimental conditions. The experimental data can be well explained by the present model. |
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| Keywords: | Emulsion liquid membrane Silver extraction Facilitated transport Permeation model |
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