HEH(EHP)从硝酸中萃取钕的动力学

The Kinetics of the Extraction of Nd(111)from Nitrite Acid Medium with HEH(EHP)

本文用单液滴法研究了2—乙基已基磷酸单2—乙基已酯(HEH(EHP))(简写为 HA)—环已烷从硝酸介质中萃取钕(Nd^(3+))的速率,考察了水相浓度酸度和萃取剂浓度等因素对萃取速率的影响,并用滴体积法测量了油水界面的张力。由吉布斯曲线推测了萃取剂分子在体相中聚集和在界面上吸附的情况。在综合速率方程和界面特性的基础上提出了萃取过程的可能机理。

The kinetics and mechanism of the extraction of Nd(111)from ni- trite acid medium with 2-ethylhexyl phasphonic acid mono(2-ethylhexyl)ester (HEH(EHP))in cyclohexane were studied by means of single drop method. The influences of[Na^(3+)],PH,and the concentration of HEH(EHP)on the extraction rate were also discussed.Interfacial tensions were measured by Drop Volume method.The Case of HEH(EHP)molecules adsorption on interface may be predicted.A possible mechanism was proposed to the rate equation and the interfacial properties.