摘要
本文系统地研究了由1—苯基—3—甲基—4—笨甲酰基吡唑酮—5(HPMBP,HA)与2—乙基已基磷酸单2—乙基己基酯(P507,HL)所构成的AA类协萃体系在硝酸介质中以苯、甲苯、二甲苯、四氯化碳为溶剂时对镨(Ⅲ)、钕(Ⅲ)、铒(Ⅲ)、铥(Ⅲ)协同萃取时的溶剂效应。用斜率法分别测定了在上述四种溶剂中萃合物的组成;计算了萃取平衡常数;并根据正规溶液理论推算出镨、钕、饵,铥萃合物的溶解度参数;以及在不同有机溶剂中计算萃取平衡常数的半经验公式。从半经验公式中计算出的理论值与实验值基本符合,证明正规溶液理论对本体系是适用的。
Abstract The solvent effect on the synergic extraction of lanthanides(Pr, Nd, Er, Tm) with P507(HL)and HPMBP(HA) from a nitric acid medium has been studied. The synergic extraction equillibrium constants in four diffe- rent inert solvent (CCI, benzene, Toluene and xylene) were determined. The solubility parameters of the extracted complexes were calculated on the basis of regular solution theroy. The formation constants logβ~0 were determined by experiment and calcula- ted with four semi-empirical expression. By comparing the theroretical and ex- perimental values of logβ~0, agreements were observed in four inert solvents.
