Evaluation of plutonium(IV) extraction rate between nitric acid and tri--butylphosphate solution using a glass chip microchannel

Yamamoto, Masahiko   ; Taguchi, Shigeo ; Sato, Soichi ; Surugaya, Naoki 

The extraction of Pu with tri--butyl phosphate (TBP) is performed using a glass microchip to evaluate the extraction rate. The parallel two-phase laminar flow is constructed in a microchannel by introducing plutonium nitrate solution and TBP diluted with -dodecane as aqueous and organic phase, respectively. It was found that extraction ratio of Pu increases with increasing the contact time of two phases. A numerical model based on the diffusion in the microchannel and the reaction at the interface was incorporated to evaluate the extraction rate. The experimental data points were subjected to least-squares fitting and the forward extraction rate of Pu(IV) was determined.