用于在超临界流体CO2中直接溶解镧系和锕系元素氧化物的TRPO-HNO3络合物的性质

研究了TRPO-HNO3络合物的一些性质.实验结果表明,当HNO3/TRPO初始体积比从1/7增大到5/1时,TRPO-HNO3络合物中HNO3浓度从2.12增大到6.16 mol/L,[HNO3]/[TRPO]比从0.93增大到3.38,络合物中水含量的变化范围为0.97%~2.70%.TRPO-HNO3络合物的比重、粘度和表面张力随络合物中HNO3浓度的变化而变化.采用氘锁定技术研究了TRPO-HNO3络合物的NMR光谱,结果表明,在NMR谱图中,络合物中HNO3和H2O的质子会快速交换,出现一个单峰,而当TRPO-HNO3络合物溶入低介电常数的溶剂时,通过NMR谱图可以发现有小的HNO3液滴形成.     

用于在超临界流体CO2中直接溶解镧系和锕系元素氧化物的TRPO-HNO3络合物的性质

研究了TRPO-HNO₃络合物的一些性质. 实验结果表明, 当HNO₃/TRPO初始体积比从1/7增大到5/1时, TRPO-HNO₃络合物中HNO₃浓度从2.12增大到6.16 mol/L, [HNO₃]/[TRPO]比从0.93增大到3.38, 络合物中水含量的变化范围为0.97%~2.70%. TRPO-HNO₃络合物的比重、粘度和表面张力随络合物中HNO₃浓度的变化而变化. 采用氘锁定技术研究了TRPO-HNO₃络合物的NMR光谱, 结果表明, 在NMR谱图中, 络合物中HNO₃和H₂O的质子会快速交换, 出现一个单峰, 而当TRPO-HNO₃络合物溶入低介电常数的溶剂时, 通过NMR谱图可以发现有小的HNO₃液滴形成.     

Study on Properties of TBP-HNO3 Complex Used for Direct Dissolution of Lanthanide and Actinide Oxides in Supercritical Fluid CO2

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.