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

作　　者：肖哲 李峰峰[1] 汪艺霖 张烨 于婷[1] 贾红伟 何辉[1] 叶国安[1] XIAO Zhe;LI Feng-feng;WANG Yi-lin;ZHANG Ye;YU Ting;JIA Hong-wei;HE Hui;YE Guo-an(China Institute of Atomic Energy,P.O.Box 275(26),Beijing 102413,China)

机构地区：[1]中国原子能科学研究院放射化学研究所,北京102413

出　　处：《核化学与放射化学》2022年第2期178-185,共8页Journal of Nuclear and Radiochemistry

摘　　要：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.

关 键 词：甲基膦酸二(1-甲庚)酯 萃取 Np(Ⅳ) 

分 类 号：TL241.1[核科学技术—核燃料循环与材料] O615.11[理学—无机化学]