Ultrasound-enhanced dissolution of UO2 in supercritical CO2 containing a CO2-Philic complexant of tri-n-butylphosphate and nitric acid
Ultrasound-enhanced dissolution of UO2 in supercritical CO2 containing a CO2-Philic complexant of tri-n-butylphosphate and nitric acid
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DOI：
10.1021/ie010761q
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发表时间：
2002-03
影响因子：
4.2
通讯作者：
Y. Enokida;Samir Abd El-Fatah;C. Wai
中科院分区：
文献类型：
--
作者：
Y. Enokida;Samir Abd El-Fatah;C. Wai
超声波的应用可以显着提高超临界流体CO2使用的CO2-可溶性磷酸三丁酯（TBP）/HNO 3/H2O络合剂作为萃取剂的小玻璃珠放置在UO 2粉末的溶解。在323 K和15 MPa下进行20 min的动态萃取，溶解在CO2中的UO 2的量与没有超声处理的实验相比可以增加一个数量级。超声波的应用可能有助于局部浓缩的UO 2（NO3）2·2 TBP从玻璃珠表面转移到超临界流体CO2中。这种不需要水溶液和有机溶剂的将二氧化铀直接溶解在超临界流体CO2中的超声波辅助过程可能在乏核燃料的后处理和某些核废物的处理方面具有重要应用。
Application of ultrasound can significantly enhance the dissolution of UO2 powders placed on small glass beads in supercritical fluid CO2 using a CO2-soluble tri-n-butylphosphate (TBP)/HNO3/H2O complexant as an extractant. The amount of UO2 dissolved in CO2 for a 20-min dynamic extraction at 323 K and 15 MPa can be increased by an order of magnitude with sonification compared to experiments without sonification. The application of ultrasound probably contributes to the transfer of locally concentrated UO2(NO3)2·2TBP from the surface of glass beads into supercritical fluid CO2. This ultrasound-aided process for direct dissolution of UO2 in supercritical fluid CO2 that requires no aqueous solutions and organic solvents may have important applications for reprocessing of spent nuclear fuels and for treatment of certain nuclear wastes.