Empirical modelling of U(IV) third phase formation in 30% TBP/n-dodecane system

Formation of second organic phase due to limiting solubility of tetravalent actinide solvates in organic solvent has been studied in a qualitative manner by several researchers. Quantitative relations for interactions among various solutes for second organic phase formation were not reported in open literature. In this contribution, an empirical model for U(IV) third phase formation in biphasic U(NO3)(4)-H2O-HNO3-30%TBP/n-dodecane system has been reported. Empirical models were also developed for correlating various third phase characteristics like temperature dependency of third phase formation, volume and concentration of constituents-U(IV) and TBP. Performance of the reported models has been compared with models previously reported.