Supercritical CO2 Extraction of Uranium(VI) from HNO3 Solution Using N,N,N',N'-Tetrabutyl-3-oxapentanediamide

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• 作者：Moonsung Koh ; Jaeryong Yoo ; Yong Park ; Daeil Bae ; Kwangheon Park ; Hakwon Kim ; and Hongdoo Kim
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2006
• 出版时间：July 19, 2006
• 年：2006
• 卷：45
• 期：15
• 页码：5308 - 5313
• 全文大小：186K
• 年卷期：v.45,no.15(July 19, 2006)
• ISSN：1520-5045

文摘

Distribution ratio (D_U) and extraction efficiency (E_U) of uranium(VI) were investigated using N,N,N',N'-tetrabutyl-3-oxapentanediamide (TBOD) in supercritical carbon dioxide (Sc-CO₂). Five diamide derivativeswere synthesized; TBOD was found to be the most suitable extractant through solubility data. The compositionratio of uranium(VI) extraction was described as a relation of UO₂(NO₃)₂TBOD, through the measurement ofD_U as the concentration ranges of HNO₃ and TBOD. Comparing this with the extractability of TBP, the D_Uof TBOD was superior to that of TBP in Sc-CO₂ by 2 orders of magnitude. The results showed that TBODcould be substituted for tri-n-butyl phosphate (TBP) in Sc-CO₂ extraction of uranium(VI). Uranium, fissionproducts (Cs, Cd, Mo, Ba), and corrosion products (Ni, Fe, Cr, Co) were extracted with TBOD in Sc-CO_2.Over 90% each of actinides (U, Th) and lanthanides (La, Ce, Gd) were extracted. But, fission products andcorrosion products were extracted at a low efficiency of less than 20%, which showed the possibility ofselective separation in these metals.