2,3-二氯吡啶合成反应热危险性研究

Study on Thermal Hazard of Synthesis Process of 2,3-dichloropyridine

采用差示扫描量热仪(DSC)、绝热加速量热仪(ARC)、Gaussian09软件和反应量热仪(RC1e)对原料、产物的热分解情况以及反应过程的热效应进行研究,并展开绝热分解动力学计算。结果表明:反应的总放热量为28.39 kJ,绝热温升ΔT_(ad)为28.15 K,最高合成反应温度MTSR为254℃,技术最高温度MTT为227℃。反应后物料在绝热分解过程中存在两段放热,其中第二段为主要放热段,对其进行绝热分解动力学分析,得到活化能Ea为729.97 kJ/mol,指前因子A为4.57×10^(68)s^(-1),并求得TD24为238.73℃。

The thermal decomposition of raw materials and products and the thermal effect of the reaction process were studied by differential scanning calorimeter(DSC),adiabatic acceleration calorimeter(ARC),Gaussian09 software and reaction calorimeter(RC1e),the adiabatic decomposition kinetics was calculated.The results showed that the total heat release was 28.39 kJ,the adiabatic temperature riseΔT_(ad) was 28.15 K,the highest synthesis temperature MTSR was 254℃,and the highest technical temperature MTT was 227℃.There were two exothermic stages in the process of adiabatic decomposition,and the second stage was the main exothermic stage.The kinetic analysis of adiabatic decomposition showed that the activation energy E a was 729.97 kJ/mol,the pre-exponential factor A was 4.57×10^(68) s^(-1),and T D24 was 238.73℃.