An evaluation of effective diffusivity in (W/O) emulsion drops

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Effective diffusivity in a (W/O) emulsion drop was examined in terms of the extraction of ammonia from the inner aqueous droplets phase to external aqueous solution of sulfuric acid in a spray column operation. The experimental values of the effective diffusivity were compared with the values calculated from a cubic model for the permeation taking account of the effect of the surfactant on the diffusion in membrane phase and the interfacial resistance. It was confirmed that the surfactant reduces significantly the diffusivity through the membrane solution and the surfactant layer at the oil-water interface has a significant resistance to the permeation across the liquid surfactant membrane.

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