Removal of Acetic Acid from Wastewater with Liquid Surfactant Membranes: An External Boundary Layer and Membrane Diffusion Controlled Model

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Abstract
A new diffusion controlled mass transfer model has been established for uniform emulsion globules without redispersion and internal circulation. Both the external boundary layer and the membrane resistance to mass transfer are taken into account and the perturbation solutions have been obtained. Experimental data on the batch extraction of acetic acid from wastewater are in good agreement with the model predictions. Usually, the zero-order, or pseudo-steady state solution alone can give an adequate description of the process. The swell of emulsion can be classified into two types-permeation and entrainment. The swelling rate by permeation of water increases with increasing the concentration of surfactant and internal reagent. Repeated redispersion and vigorous stirring promote the swell due to the entrainment. The swelling mechanism of the entrainment has been discussed.