节点文献
HNO3/30%TBP/煤油体系中镎的氧化——萃取动力学
Oxidation and extraction dynamics of Np in the system of HNO3/30%TBP/OK
【Author】 LIU Zhan-yuan;ZHOU Xian-ming;ZHANG Hu;LI Li;China Institute of Atomic Energy;
【机构】 中国原子能科学研究院;
【摘要】 在30%TBP/煤油-HNO3两相介质中研究了五价镎的硝酸氧化及TBP萃取耦合过程,考察了HNO2浓度、HNO浓度,温度等因素对Np(Ⅴ)-Np(Ⅵ)氧化还原反应及其萃取动力学的影响;获得了Np(Ⅴ)的氧化-萃取过程表观动力学方程:-d[Np(Ⅴ)]a/dt=kf(1-(D+1)/D[Np(Ⅵ)]a)[HNO3]a3.8[HNO2]a0.44,15℃时表观速率常数kf=(1.31±0.27)×10-3(L/mol)4.2min-1,得到了表观活化能为Ea=(52.9±8.9)kJ/mol,并解释了氧化-萃取过程的机理。
【Abstract】 The oxidation of Np(Ⅴ) by nitric acid and the coupling extraction in the system of HNO3/30%TBP/OK was studied.The influence of nitric acid concentration,nitrite acid concentration,reaction temperature on the Np(Ⅴ) oxidation and coupling extraction was investigated.The dynamics of Np(Ⅴ) oxidation-coupling extraction was obtained:-d[Np(Ⅴ)]a/dt=kf(1-(D+1)/D[Np(Ⅵ)]a)[HNO3]a3.8[HNO2]a0.44,the apparent rate constant kf =(1.31 ± 0.27) ×10-3(L/mol)4.2min-1 at 15 ℃,and the activation energy Ea =(52.9 ± 8.9) kj/mol.The oxidation and extraction mechanism was discussed.
【Key words】 Np(Ⅴ); oxidation-extraction coupling process; extraction dynamics; mechanism;
- 【会议录名称】 中国核科学技术进展报告(第四卷)——中国核学会2015年学术年会论文集第6册(核化学与放射化学分卷、核化工分卷)
- 【会议名称】中国核学会2015年学术年会
- 【会议时间】2015-09-21
- 【会议地点】中国四川绵阳
- 【分类号】O614.352;O658.2
- 【主办单位】中国核学会