N-辛酰吡咯烷在不同稀释剂中萃取铀(Ⅵ)的研究

The influence of diluent on extraction behavior of uranium with N-octanoylpyrrolidine

研究了在不同稀释剂中N -辛酰吡咯烷 (OPOD)萃取铀 (Ⅵ )的性能。在不同稀释剂中考察了硝酸浓度、萃取剂浓度、盐析效应以及温度对萃取平衡的影响。OPOD萃取铀 (Ⅵ )的能力在不同稀释剂中由弱到强的顺序为 :氯仿 ,四氯化碳 ,1.2 -二氯乙烷 ,正十二烷 ,正辛烷 ,环己烷 ,甲苯 ,苯。并求出了萃取反应的各热力学函数变化值。

Extraction of uranium (Ⅵ) from nitric acid solutions with N-octanoylpyrrolidine (OPOD) in a series of diluents has been studied. The dependence of the extraction distribution ratios on the concentrations of aqueous nitric acid, extractant, salting-out agent and the temperature was investigated. The experimental results showed that the extracting capacity of OPOD in different diluents increases in the order: chloroform, CCl 4, 1,2-dichloroethane, n-dodecane, n-octane, c-hexane, toluene and benzene. It can not be expounded only on the basis of polarity of the diluents. The interaction between extractant or extracted complex and diluent was discussed.