The extraction equilibrium of europium (Eu) with diisostearylphosphoric acid (DISPA, HR) was measured in Various solvents at 303 K. The stoichiometry of the complex extracted and the extraction equilibrium constants were determined. The extraction rate of Eu with DISPA was measured using a stirred transfer cell. The extraction rate was found to be limited by the diffusion process. The permeation of Eu through an emulsion liquid membrane containing DISPA as a carrier and Span 80 as a surfactant was carried out. Under the experimental conditions, the reaction resistance contributed to the overall permeation process. An interfacial reaction model was proposed to explain the experimental results.