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借助差示扫描量热仪(Differential Scanning Calorimetry,DSC)对过氧化苯甲酰(Benzoyl Peroxide,BPO)的热分解过程进行研究。动态DSC结果表明,BPO的吸热峰和分解峰重叠,因而无法通过基于放热曲线的转化率计算其动力学参数。这也表明了该物质的高度危险性。等温DSC结果表明,BPO在固态时就会发生分解,具有自催化性质,易发生热分解反应失控;该物质的熔点在90~92℃。基于等温DSC数据,利用Friedman法计算了BPO的热分解动力学参数,推导出等温诱导期与温度的函数关系,计算得到等温诱导期为7 d时的环境温度(约为75℃)。使用有限元分析方法(Finite ElementAnalysis,FEA)模拟得到50 kg BPO的自加速分解温度(Self-Accelerating Decomposition Temperature,SADT)约为79℃。
The thermal decomposition of benzoyl peroxide (Benzoyl Peroxide, BPO) was studied by differential scanning calorimetry (DSC). Dynamic DSC results show that the endothermic peak and decomposition peak of BPO overlap, and therefore the kinetic parameters can not be calculated by the conversion based on the exothermic curve. This also shows the high degree of danger of the substance. Isothermal DSC results show that, BPO in the solid state will decompose, with autocatalytic properties, prone to thermal decomposition reaction out of control; the melting point of the material at 90 ~ 92 ℃. Based on the isothermal DSC data, the thermal decomposition kinetic parameters of BPO were calculated by Friedman method. The relationship between isothermal induction temperature and temperature was deduced. The ambient temperature (about 75 ℃) when the isothermal induction period was 7 d was calculated. The self-accelerating Decomposition Temperature (SADT) of 50 kg BPO was about 79 ℃ using finite element analysis (FEA).