Abstract:The physical and chemical properties of adjacent rare earth elements Eu and Gd are similar, so their separation is particularly difficult. By the conventional equilibrium extraction method, the separation efficiency of Eu and Gd is low. The method of thin layer oil film laminar flow extraction can not only accelerate the interface renewal speed, but also control the laminar flow of water phase. Bifunctional ionic liquid [A336][P204] was used as the extractant. It is found that the increase of extractant concentration and the decrease of oil film thickness are both beneficial to extraction, but not conducive to mutual separation of Gd/Eu. However, the increase in flow velocity of water phase is not favorable for extraction, but is conducive to separation. Based on thin layer oil film laminar flow extraction method, it is expected to achieve the kinetic enhanced separation of adjacent rare earths Eu and Gd depending on their difference of mass transfer rates.