Modeling of the permeation swelling of emulsion during lactic acid extraction by liquid surfactant membranes

Based on the extraction mechanism by carriers in the membrane phase, the hy drophilic property of the carrier-solute complex formed at the interface of emulsion has been studied. By gas chromatograph the solubility of water in the membrane phase was measured. Solubilization of water in the membrane p hase is caused not only by surfactant but also by carrier-solute complex. F urthermore, water diffusion through the membrane goes on due to both the ch emical potential of electrolytes and the chemical potential between reactan ts and reaction products. A mathematical model for estimating the permeatio n swelling rate during lactic acid extraction is proposed. With this model, the calculation results are in good agreement with the experimental data. (C) 2001 Elsevier Science B.V. All rights reserved.