An improved advancing front model for type II facilitated transport has been developed. The proposed model not only takes into account the mass transfer both inside and outside the emulsion globules

the interfacial chemical reaction

but also the influence of the permeation swelling and the breakage. Computer simulation was performed by the Crank - Nicolson implicit method. The results indicate that the process of computation is converged steadily and the model prediction agrees well with the experimental data.