STUDY ON THE THREE-PHASE EXTRACTION SYSTEM OF TBP-"KEROSENE/H₃PO₄-H₂O*^*

Abstract

The phase behavior and phase composition of TBP-kerosene/ H₃PO₄-H₂O three-phase extraction system have been "inves-tigated and compared with the two-phase system without the diluent. In TBP-kerosene/H₃PO₄-H₂O system, the formation of the third phase is related only to the equilibrium concentration of H₃PO₄ in the bottom (aqueous) phase (C_{H3 PO4, b} > 9.8 mol/L). The composition of the middle phase is not a function of only the C_{H3PO4, b}, but also relates to the initial concentration of TBP. At C_H3PO4 = 9.8 mol/L, the composition of the extracted complex in the middle phase is (TBP)·(H₃PO₄)·(H₂O)_0.5, which is the same as that of the organic phase in two-phase system.

^*This work has been supported by the National Natural Science Foundation of China (29971020) and the Natural Science Foundation of Shandong Province (L2000B01).

Keywords:

• TBP
• Three-phase extraction
• H₃PO₄

Acknowledgments

Notes

^*This work has been supported by the National Natural Science Foundation of China (29971020) and the Natural Science Foundation of Shandong Province (L2000B01).