稀硝酸体系中N,N-二甲基羟胺与亚硝酸反应的动力学  

Reaction Kinetics Between N,N-Dimethylhydroxylammonium Ion and Nitrous Acid in Nitric Acid

作　　者：朱冬冬[1] 李传博[1] 郑卫芳[1] 晏太红[1] 谢书宝[1] 左臣[1] 石四维 

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》2016年第5期267-273,共7页Journal of Nuclear and Radiochemistry

摘　　要：采用分光光度法研究了0.1~0.4mol/L稀硝酸体系中N,N-二甲基羟胺（DMHAN）与亚硝酸的反应动力学,包括硝酸浓度、亚硝酸浓度、二甲基羟胺浓度、离子强度、温度等条件的影响。稀硝酸体系中二甲基羟胺与亚硝酸反应的动力学方程为：-dc（HNO0.452）/dt=kc1.26（HNO2）c0.85（DMHAN）c（H＋）在20℃,离子强度为0.50mol/L时,k=3.09（mol/L）-1.56·s-1,Ea≈55.1kJ/mol;反应中,亚硝酸与二甲基羟胺的表观反应计量比约为2.5∶1。The reaction kinetics of N, N-dimethylhydroxylammonium ion（DMHAN） with nitrous acid were studied by spectrophotometerly in 0.1-0.4 mol/L nitric acid media. Influ- ences of temperature, ion strength, nitric DMHAN concentration were investigated. acid concentration, nitrous acid concentration and The reaction rate equation is obtained as.-dc（HNO0.452）/dt=kc1.26（HNO2）c0.85（DMHAN）c（H＋）The reaction rate constant and the reaction activation energy are 3.09 （mol/L）-1.56 · s-1 and 55.1 kJ/mol at 20 ℃,μ=0.50 mol/L, respectively. The stoichiometric ratio of nitrous acid to DMHAN is observed by 2.5：1

关 键 词：二甲基羟胺 硝酸 亚硝酸 反应动力学 计量比 

分 类 号：O643.12[理学—物理化学]