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Further study of extraction equilibrium of uranium(VI) with dicyclohexano-18-crown-6 and its application to separating uranium and thorium

  • Wen-Ji Wang
  • Qing Sun
  • Bozhong Chen
Article

Abstract

In our publication (1), the extraction of uranium with dicyclohexano-18-crown-6 (mixed isomers) has been described. The extraction equilibrium of uranium(VI) from aqueous hydrochloric acid solution with dicyclohexano-18-crown-6 isomer A (Ia) and isomer B (Ib) in 1,2-dichloroethane is presented in this paper. The extracted species are found to be 1:2 (metal/crown) for Ia and 2:3 for Ib from slope analysis and direct determination of extracted complexes. The extraction equilibrium constants (Kex) have been determined at 25°C, and equal 29.5 for the former and 0.208 for the latter. It is concluded that Ia has stronger coordinate ability for uranium than Ib. The different orientation of the lone pairs of the oxygen atoms in both isomers will be taken into account for interpreting above results. The extraction of uranium(VI) with dicyclohexano-18-crown-6 (mixed isomers) or Ia from aqueous hydrochloric acid solution is effective and selective. In 0.1M crown ether-1,2-dichloroethane-6N HCl system, the separation factor U(VI)/Th(IV) exceeds 1000. The result can be taken in separating uranium and thorium.

Keywords

Uranium Oxygen Atom Thorium Lone Pair Separation Factor 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    WEN-JI Wang, BOZHONG CHEN et al., J. Radioanal. Chem., 76 (1983) 49.Google Scholar
  2. 2.
    V. V. YAKSHCHIN, B. N. LASKORIN, et al., Dokl. Akad. Nauk. SSR, 241 (1977) 159.Google Scholar
  3. 3.
    A. M. ROZEN, A. V. BOGATSKI, et al., Dokl. Akad. Nauk. SSSR, 263 (1982) 1165.Google Scholar
  4. 4.
    R. M. IZATT, B. L. HAYMORE, Z. S. BRADSHAW, J. J. CHRISTENSEN, Inorg. Chem., 14 (1975) 3132.Google Scholar
  5. 5.
    R. WILLSTATTER, G. SCHUDEL, Chem. Ber., 51 (1918) 782.Google Scholar
  6. 6.
    H. K. FRENSDORFF, J. Am. Chem. Soc., 93 (1971) 4684.Google Scholar
  7. 7.
    M. MERCER, M. R. TRUTER, J. Chem. Soc., Dalton (1973) 2215.Google Scholar

Copyright information

© Akadémiai Kiadó 1987

Authors and Affiliations

  • Wen-Ji Wang
    • 1
  • Qing Sun
    • 1
  • Bozhong Chen
    • 1
  1. 1.Department of Nuclear ScienceFudan UniversityShanghaiPeople's Republic of China

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