| Study on Properties of TBP-HNO3 Complex Used for Direct Dissolution of Lanthanide and Actinide Oxides in Supercritical Fluid CO2 |
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| 作者姓名： | 段五华 朱礼洋 景山 朱永 |
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| 作者单位： | Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 102201, China |
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| 基金项目： | Project supported by the National Natural Science Foundation of China （No. 20506014）. |
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| 摘 要： | The tri-n-butyl phosphate-nitric acid （TBP-HNO3） complex prepared by contacting the pure TBP with the concentrated HNO3 can be used for direct dissolution of lanthanide and actinide oxides in the supercritical fluid carbon dioxide （SCF-CO2）. Properties of the TBP-HNO3 complex have been studied. Experimental results showed that when the initial HNO3/TBP volume ratio was varied from 1 ： 7 to 5 ： 1, the concentration of HNO3 in the TBP-HNO3 complex changed from 1.95 to 5.89 mol/L, the HNO3]/TBP] ratio of the TBP-HNO3 complex changed from 0.61 to 2.22, and the content of H20 in the TBP-HNO3 complex changed from 2.02% to 4.19%. All of the density, viscosity and surface tension of the TBP-HNO3 complex changed with the concentration of HNO3 in the complex, and were higher than those of the pure TBE The protons of HNO3 and H2O in the complex underwent rapid exchange to exhibit a singlet resonance peak in nuclear magnetic resonance spectra. When the TBP-HNO3 complex was dissolved in a low dielectric constant solvent, small droplets of HNO3 were formed that can be detected by NMR.
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| 关 键 词： | 超临界二氧化碳流体 镧系氧化物 锕类氧化物 直接溶解作用 TBP-硝酸配合物 性质 乏燃料 |
| 修稿时间： | 2006-05-222006-11-17 |
Study on Properties of TBP-HNO3 Complex Used for Direct Dissolution of Lanthanide and Actinide Oxides in Supercritical Fluid CO2 |
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| DUAN Wu-Hua, ZHU Li-Yang,JING Shan, ZHU Yong-Jun,CHEN Jing.Study on Properties of TBP-HNO3 Complex Used for Direct Dissolution of Lanthanide and Actinide Oxides in Supercritical Fluid CO2[J].Chinese Journal of Chemistry,2007,25(3):319-322. |
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| Authors: | DUAN Wu-Hua ZHU Li-Yang JING Shan ZHU Yong-Jun CHEN Jing |
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| Institution: | Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 102201, China |
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| Abstract: | The tri‐n‐butyl phosphate‐nitric acid (TBP‐HNO3) complex prepared by contacting the pure TBP with the concentrated HNO3 can be used for direct dissolution of lanthanide and actinide oxides in the supercritical fluid carbon dioxide (SCF‐CO2). Properties of the TBP‐HNO3 complex have been studied. Experimental results showed that when the initial HNO3/TBP volume ratio was varied from 1:7 to 5:1, the concentration of HNO3 in the TBP‐HNO3 complex changed from 1.95 to 5.89 mol/L, the HNO3]/TBP] ratio of the TBP‐HNO3 complex changed from 0.61 to 2.22, and the content of H2O in the TBP‐HNO3 complex changed from 2.02% to 4.19%. All of the density, viscosity and surface tension of the TBP‐HNO3 complex changed with the concentration of HNO3 in the complex, and were higher than those of the pure TBP. The protons of HNO3 and H2O in the complex underwent rapid exchange to exhibit a singlet resonance peak in nuclear magnetic resonance spectra. When the TBP‐HNO3 complex was dissolved in a low dielectric constant solvent, small droplets of HNO3 were formed that can be detected by NMR. |
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| Keywords: | TBP-HNO3 complex supercritical fluid carbon dioxide property |
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