【摘要】 本文研究了甲基膦酸二（1-甲庚）酯（DMHMP）和2-乙基已基膦酸单（2-乙基己基）酯（HEHEHP）协同萃取硝酸钠酰。用斜率法测得协萃络合物的组成为UO₂（NO₃）（HA₂）·DMHMP。在20℃时（离子强度为0.5）协萃反应平衡常数1gβ₁₂=4.95。并求得了热力学函数ΔH、ΔZ和ΔS分别为—2.50×10⁴J·mol^-1、-2.75×10⁴J·mol^-1和8.61J·mol^-1·K^-1。依据锥角堆积模型讨论了协萃反应机理。更多还原

【Abstract】 In the synergistic extraction of uranium nitrate with binary system of di-(1-methyl heptyl) methyl phosphate(DMHMP) and 2-ethyl hexyl 2-ethyl hexyl phosphonic acid(HEHEHP), there are three kinds of equilibria:The equilibrium constants of DMHMP, HEHEHP and binary synergistic extraction are determined to be lgβ10= 3.64(DMHMP), lgβ20 = 3.62(HEHEHP), lgβ12 = 4.95(DMHMP-HEHEHP). By determining the effect of temperature on the distribution ratio, △H,△Z, and △S of synergistic extraction are evaluated to be -2.5×104J.mol-1 ,-2.75×104J. mol-1 and 8.61 J.mol-1.K-1 . The extraction mechanism of uranium nitrate arc discussed. A possible structure of the synergistic extracting complex is proposed based on a cone-angle model.更多还原