硝酸介质中单甲基肼与亚硝酸的反应动力学  

Reaction Kinetics of Mono-methyihydrazine With Nitrous Acid in Nitric Acid Medium

作　　者：魏艳[1] 丛海峰[1] 潘永军[1] 矫海洋[1] 贾永芬[1] 

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：《原子能科学技术》2008年第10期887-890,共4页Atomic Energy Science and Technology

摘　　要：采用分光光度法研究硝酸介质中单甲基肼(MMH)与亚硝酸(HNO_2)的反应。HNO_2和MMH反应动力学速率方程为-dc(HNO_2)/dt=kc(H^+)c^(1.1)(NO_3^-)c^(1.1)(MMH)c(HNO_2)。当t=2.6℃、c(NO_3^-)=0.50mol/L时,反应速率常数k=(115±2)(mol/L)^(-3.2)·s^(-1),反应活化能E_a=(37.8±0.1)kJ/mol。研究结果表明:在硝酸介质中,甲基肼与亚硝酸能快速反应;提高酸度、MMH浓度或硝酸根浓度均有利于亚硝酸的还原。The oxidation of mono-methylhydrazine （MMH） with nitrous acid in nitric acid medium was researched. The rate equation was determined as follows： --dc（HNO2）/dt=kc（H＋）cII（NO3^-）c^1,1（MMH）c（HN02）. The k is （115±2） （tool/ L）^-3.2· s^-1 and the corresponding activation energy E. is （37.8±0.1） kJ/mol with the nitrate concentration of 0.50 mol/L at the temperature of 2.6 ℃. The result indicates that the oxidation of MMH with nitrous acid is fast. The increase in the acidity and the concentration of MMH or NO3^- can speed the reduction of nitrous acid.

关 键 词：单甲基肼 亚硝酸 反应动力学 

分 类 号：TL24[核科学技术—核燃料循环与材料]