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Properties of TRPO-HNO3 complex used for direct dissolution of lanthanide and actinide oxides in supercritical fluid CO2

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Abstract

The mixed trialkylphosphine oxide-nitric acid (TRPO-HNO3) complex prepared by contacting pure TRPO with concentrated HNO3 may be used as additives for direct dissolution of lanthanide and actinide oxides in the supercritical fluid carbon dioxide (SCF-CO2). Properties of the TRPO-HNO3 complex have been studied. Experimental results show when the initial HNO3/TRPO volume ratio is varied from 1:7 to 5:1, the concentration of HNO3 in the TRPO-HNO3 complex changes from 2.12 to 6.16 mol/L, the [HNO3]/[TRPO] ratio of the TRPO-HNO3 complex changes from 0.93 to 3.38, and the content of H2O in the TRPO-HNO3 complex changes from 0.97% to 2.70%. All of the density, viscosity and surface tension of the TRPO-HNO3 complex change with the concentration of HNO3 in the complex. The protons of HNO3 and H2O in the complex undergo rapid exchange to exhibit a singlet resonance peak in NMR spectra with D2O insert. When the TRPO-HNO3 complex dissolves in a low dielectric constant solvent, small droplets of HNO3 appear which can be detected by NMR.

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Authors and Affiliations

  1. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing, 102201, China

    Duan WuHua, Zhu LiYang, Jing Shan & Zhu YongJun

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  1. Duan WuHua
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  2. Zhu LiYang
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  3. Jing Shan
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  4. Zhu YongJun
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Correspondence to Duan WuHua.

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Supported by the National Natural Science Foundation of China (Grant No. 20506014)

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Duan, W., Zhu, L., Jing, S. et al. Properties of TRPO-HNO3 complex used for direct dissolution of lanthanide and actinide oxides in supercritical fluid CO2 . Sci. China Ser. B-Chem. 50, 759–763 (2007). https://doi.org/10.1007/s11426-007-0081-1

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  • DOI: https://doi.org/10.1007/s11426-007-0081-1

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