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为研究偶氮二环己基甲腈(ACCN)在相关工艺过程中的热危险性,采用差示扫描量热仪(DSC)对ACCN及其苯胺(AN)溶液进行动态测试,发现溶于AN后,ACCN的起始分解温度前移,热稳定性变差。利用Friedman法得到,转化率为0.15~0.8时ACCN的AN溶液的活化能平均值为121 k J/mol。采用Coats-Redfern法研究ACCN的AN溶液的热分解机理,得到其积分动力学机理函数。采用绝热加速量热仪(ARC)对ACCN以及ACCN+AN进行绝热分解测试,在热惯量修正的基础上,得到其TD24(最大反应速率到达时间为24 h的温度)分别为79.3℃与68.1℃,同样得到ACCN在AN中热稳定性变差的结论。因此,在相关工艺要求ACCN与AN溶剂混合使用的场合,必须严格控制温度,预防热爆炸事故的发生。
In order to study the thermal risk of ACCN in the related process, the dynamic test of ACCN and its aniline (AN) solution by differential scanning calorimetry (DSC) , ACCN decomposition of the initial decomposition temperature, thermal stability worsened. The average activation energy of ANCN solution obtained by Friedman method was 121 kJ / mol at a conversion of 0.15 ~ 0.8. The thermal decomposition mechanism of AN solution of ACCN was studied by Coats-Redfern method, and its integral kinetic mechanism function was obtained. Adiabatic acceleration calorimeter (ARC) was used to conduct adiabatic decomposition tests on ACCN and ACCN + AN. Based on the thermal inertia correction, TD24 (maximum reaction rate reached 24 h) were obtained as 79.3 ℃ and 68.1 ℃ respectively , The same conclusion is obtained that the thermal stability of ACCN in AN is worsened. Therefore, when the relevant process requires the use of ACCN mixed with AN solvent, the temperature must be strictly controlled to prevent the occurrence of thermal explosion accident.