An type Ⅱ interfacial reaction diffusion model for facilitating transport in the liquid surfactant membranes has been developed. Besides considering aqueous diffusion

membrane diffusion and interfacial chemical reactions as simultaneous controlling factors

the model includes the influence of the ELM breakage. The model quantitatively proven in the batch extraction of scandium is especially applicable to the low concentration solution (less than 0. 22 mmol/L)