Journal of Radioanalytical and Nuclear Chemistry

, Volume 299, Issue 3, pp 1693–1700 | Cite as

Characteristics of an oxa-diamide–HNO3 extractant in the supercritical fluid extraction of uranium

  • Joanna S. Wang
  • Weisheng Liao
  • Chien M. Wai
  • JyaJyun Yu
  • KongHwa ChiuEmail author


An extractant is required in the recovery process to drive the uranium to a stage that enables it to be extracted using the extraction solvent. This paper proposes the composition of a composite extractant, N,N,N′,N′-tetrabutyl-3-oxapentane-diamide–HNO3 (TBODA–HNO3) as an extractant, to successfully achieve the objective using supercritical carbon dioxide (sc-CO2). The composite TBODA–HNO3 extractant has a chemical composition of TBODA(HNO3)1.0(H2O)1.5. The U(IV) in the UO2 containing solid phase is directly oxidized to U(VI) in the form of \( {\rm UO}_{2}^{2 + } \) in sc-CO2, which contains a CO2-soluble TBODA–HNO3 extractant at 200 atm and 50 °C. The resulting \( {\rm UO}_{2}^{2 + } \)/TBODA complex can be consequently extracted using acetone-modified sc-CO2. The chemical composition of the \( {\rm UO}_{2}^{2 + } \)/TBODA complex, which can be extracted by nonpolar sc-CO2, is proposed in the form of an ion pair: [UO2(TBODA)2]2+–2(\( {\rm NO}_{3}^{ - } \)).


Supercritical fluid extraction Uranium Extractant 



This work was partially supported by the National Science Council, Taiwan, ROC (NSC 98-2811-M-259-004).


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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2013

Authors and Affiliations

  • Joanna S. Wang
    • 1
  • Weisheng Liao
    • 1
    • 2
  • Chien M. Wai
    • 1
  • JyaJyun Yu
    • 3
  • KongHwa Chiu
    • 2
    Email author
  1. 1.Department of ChemistryUniversity of IdahoMoscowUSA
  2. 2.Department of ChemistryNational Dong Hwa UniversityHualienTaiwan, ROC
  3. 3.Department of Environmental Engineering and ScienceFeng Chia UniversityTaichungTaiwan, ROC

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