【摘要】 该文研究了N,N-二异丙基丁酰胺(DIPBA)在4 mol/l硝酸底液中萃取U(VI)的机理和pH=1.5左右与1-苯基3-甲基4-苯甲酰基吡唑啉酮-5(HPMBP)有明显的二元异类协同效应。并测定了萃合物的组成及平衡常数和热力学函数。更多还原

【Abstract】 N, N Dialkyl substituted alkyl amide has been used as a extractant recently.Cheeper cost, stability, better decontamination of uranium from some fissionproducts, higher separative coefficient of uranium-thorium and less-deleteriousdegradation products make it more usefull in some extraction systems. In this work, at higher nitrate ion concentration, the extraction of uraniumand at Iower nitrate ion concentration the binary synergistic extraction of uraniumby using DIPBA and DIPBA-HPMBP respectively were investigated. At higher nitrate ion concentration, the extractive equilibrium constant of N,N-DIPBM was determined to be Logβ₁₀=-0.27. By determining the effect oftemperature on the distribution ratio, △G°, △H and △S°of the individual reactionwere evaluated as follows: △G°=-1.72kJ/mol; △H=-16.2kJ/mol; △S°=-60 J/Kmol. At pH=1.5, DIPBA and PMBP have synergistic effect. The formation ofbinary extracted complex, UO₂（PMBP）₂, DIPBA, was confirmed by the usual slopemethod. The equilibrium constant Logβ₁₂=4.51, and the effect of temperature△S°₁₂=-14.4 J/Kmol were determined.更多还原