基于加速量热仪的3,4-二硝基吡唑绝热分解分析

Adiabatic Decomposition Analyses of 3,4-Dinitropyrazole by Accelerating Rate Calorimeter

为了研究3,4-二硝基吡唑(DNP)的热分解性能和热稳定性,采用绝热加速量热仪(ARC)对其在绝热条件下的热分解进行了研究,得到了DNP绝热分解的温度、压力、温升速率等随时间及温度的变化曲线。结果表明:DNP的绝热分解分为四个阶段,后两个阶段为其主要热分解阶段;主要的热分解从245.5℃开始,绝热分解整体是较为缓慢的,没有自催化现象发生,证明DNP具有良好的热稳定性;根据温升速率方程及Arrhenius公式对这后两个阶段进行了动力学计算,两个阶段的热分解反应级数为0.5和1,活化能分别为218.4 kJ/mol、331.1 kJ/mol,指前因子分别为7.9×10^(18)min^(-1)、6.9×10^(28) min^(-1),并得到了DNP绝热分解温升速率随温度变化的数据模型。

In order to study the thermal decomposition and thermal stability of 3,4-dinitropyrazole（ DNP）,the thermal decomposition of DNP was studied by adiabatic accelerating calorimeter（ ARC） under adiabatic conditions.The curves of temperature,pressure and temperature rise rate plot time or temperature of adiabatic decomposition of DNP were obtained. The results show that the adiabatic decomposition can be divided into four stages and the latter two stages are the main thermal decomposition stages with the temperature begin at 245. 5 ℃. Adiabatic decomposition of DNP is slow and there is no autocatalytic phenomena happened in which,therefore DNP has good thermal stability. Dynamics calculation was performed in accordance with the latter two stages using temperature rise rate equation and Arrhenius equation. The reaction orders of the two stages are 0. 5 and 1,the thermal decomposition activation energy of the two stages are 218. 4 kJ/mol,331. 1 kJ/mol and the pre-exponential factors are 7. 9 ×10^18 min^-1,6. 9 × 10^28 min^-1,respectively. The data model of temperature rise rate with temperature for DNP adiabatic decomposition was obtained.