甲基膦酸二(1-甲庚)酯对Np(Ⅳ)的萃取行为

Extraction of Np(Ⅳ) From Nitric Acid Solution With Di(1-Methyl-Heptyl) Methyl Phosphonate

研究了以煤油为稀释剂、甲基膦酸二(1-甲庚)酯(DMHMP)对硝酸介质中Np(Ⅳ)的萃取性能,考察相接触时间、萃取剂浓度、硝酸根浓度、HNO_(3)浓度和温度对Np(Ⅳ)萃取分配比的影响。萃取过程主要以中性分子形式对Np(Ⅳ)进行萃取,利用斜率分析方法对萃取机理进行了探究,表明萃合物的组成为Np(NO_(3))_(4)·2DMHMP。该反应的焓变为负值,表明萃取反应为放热反应。

The extraction of Np(Ⅳ) from nitric acid medium by using di(1-methyl-heptyl) methyl phosphonate diluted in kerosene was investigated. The influences were studied in this research including the contact time, the concentration of DMHMP, HNO_(3)as well as nitrate and the temperature. Slope analyses indicate that Np(Ⅳ) is coordinated mainly in the form of neutral molecules and the extractant complex is Np(NO_(3))_(4)·2 DMHMP. The value of enthalpy change for the reaction is negative which means that the extraction of Np(Ⅳ) is an exothermic process.