Characterization of a tri-n-butyl phosphate-nitric acid complex:: A CO2-soluble extractant for dissolution of uranium dioxide

被引：51
作者：
Enokida, Y
Tomioka, O
Lee, SC
Rustenholtz, A
Wai, CM [1 ]
机构：
[1] Univ Idaho, Dept Chem, Moscow, ID 83844 USA
[2] Nagoya Univ, Res Ctr Nucl Mat Recycle, Nagoya, Aichi 4648603, Japan
[3] Nagoya Univ, Venture Business Lab, Nagoya, Aichi 4648603, Japan
来源：
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH | 2003年 / 42卷 / 21期
关键词：
D O I：
10.1021/ie030010j
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
Tri-n-butyl phosphate (TBP) reacts with nitric acid to form a hydrogen-bonded complex TBP(HNO3)(x)(H2O)(y) that is highly soluble in supercritical fluid carbon dioxide (SF-CO2). The value of x can be up to 2.5, whereas the value of y varies between 0.4 and 0.8 determined by acid-base and Karl Fischer titrations. The protons of HNO3 and H2O in the complex undergo rapid exchange and exhibit a singlet resonance peak in NMR spectra. When the complex is dissolved in a low dielectric constant solvent, small droplets of nitric acid are formed that can be detected by NMR. Phase behavior studies indicate that the complex forms a single phase with SF-CO2 above a certain pressure for a given temperature. This CO2-soluble Lewis acid-base complex provides a method of introducing nitric acid in SF-CO2 for effective dissolution of uranium dioxide, lanthanide oxides, and perhaps other metal oxides.
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页码：5037 / 5041
页数：5
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