Targeted inhibition of AIBN explosion chain reactions: Gas-phase product characterization and thermal decomposition kinetics

This paper takes the typical thermally unstable azo compound AIBN as the research object. For the key free radicals in its explosive chain reaction, two inhibitors and two target inhibitory additives were selected. Through a 20-liter spherical test device and gas-phase product analysis, the inhibitory effect of the target inhibitory additives on the explosive chain reaction was derived. The inhibition mechanism was expounded from both physical and chemical inhibition aspects through ARC experiments.The experimental results show that AIBN has very high risk of explosion and severity,. However, the compounding of DW with FAS and KI can effectively inhibit the explosion pressure and achieve complete explosion suppression, while also inhibiting the generation of toxic gases. The ARC studies discovered that FAS and KI can increase the adiabatic temperature of the thermal decomposition process of AIBN and significantly reduce the apparent activation energy of the reaction to achieve the effect of inertia.