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研究了 2 5℃下HNO3、Al(NO3) 3和U(Ⅵ )浓度对 5%TBP/煤油萃取Np(Ⅳ )分配比的影响 ,求出了相应条件下的经验公式。考察了TBP浓度对Np (Ⅳ )萃取的影响 ,Np (Ⅳ )以Np(NO3) 4 ·2TBP形式被萃入有机相 ,2 5℃下TBP萃取Np (Ⅳ )的反应平衡常数Kex =2 60mol- 6·L6。考察了温度对Np(Ⅳ )萃取分配的影响 ,该反应为吸热反应 ,反应的焓变ΔH =1 18kJ/mol,2 5℃下萃取反应的自由能ΔG =- 2 37kJ/mol。
The effects of HNO3, Al (NO3) 3 and U (Ⅵ) concentration on the Np (Ⅳ) partition ratio of 5% TBP / kerosene at 25 ℃ were studied, and the empirical formula under the corresponding conditions was obtained. The effect of TBP concentration on the extraction of Np (Ⅳ) was investigated. Np (Ⅳ) was extracted into the organic phase as Np (NO3) 4 · 2TBP. The reaction equilibrium constant Kex = 2 60mol - 6 · L6. The effect of temperature on the extraction and distribution of Np (Ⅳ) was investigated. The reaction was endothermic. The enthalpy change ΔH = 18kJ / mol and the free energy ΔG = -237kJ / mol at 25 ℃.