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Solvent Extraction and Ion Exchange Volume 20, 2002 - Issue 2
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Original Articles

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

Fu Xun Qingdao Institute of Chemical Technology, Qingdao, 266042, P. R. ChinaCorrespondence[email protected]
,
Shi Jinhui Qingdao Institute of Chemical Technology, Qingdao, 266042, P. R. China
,
Zhu Yan Qingdao Institute of Chemical Technology, Qingdao, 266042, P. R. China
&
Hu Zhengshui Qingdao Institute of Chemical Technology, Qingdao, 266042, P. R. China
Pages 241-250 | Received 21 Apr 2001, Published online: 15 Feb 2007
 
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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 (CH3 PO4, b > 9.8 mol/L). The composition of the middle phase is not a function of only the CH3PO4, b, but also relates to the initial concentration of TBP. At CH3PO4 = 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).

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).

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