Thermal hazard analyses for the synthesis of benzoyl peroxide

TLDR: In this paper, thermal hazard analysis of benzoyl peroxide (BPO) was studied using RC1e (Reaction Calorimeter) and PHI-TEC to obtain thermal hazard coefficients.

Abstract: Benzoyl peroxide (BPO), historically, due to its wide applications around the world, has caused many serious fire and explosion accidents. In this paper, in order to prevent such accidents, thermal hazard analyses of synthesis of benzoyl peroxide were studied. Firstly, in order to obtain thermal hazard coefficients, the exothermic processes with different alkaline solutions were studied by RC1e (Reaction Calorimeter). The alkaline solutions are NaOH, NH 4 HCO 3 and Na 2 CO 3 , respectively. Secondly, the thermal decomposition of BPO product was studied by PHI-TECⅡto analysis the thermal stability. Finally, the possibility of runaway reactions and thermal risks of synthetic process were evaluated according to the Stoessel criticality diagram. In the first stage, the test results of the reaction heat (Δ H m ), heat release rate ( q r ) and adiabatic temperature rise (Δ T ad ) with different alkaline solutions were NaOH > Na 2 CO 3  > NH 4 HCO 3 . In the second stage, according to the analysis of experimental data, the heat release rate of reaction with NH 4 HCO 3 solution was the slowest, while the Maximum Temperature of the Synthesis Reaction ( MTSR ) and the adiabatic temperature rise (Δ T ad ) were lowest when using Na 2 CO 3 solution. The time needed to reach the maximum reaction rate under the adiabatic condition ( TMR ad ) was 0.83 h when using NaOH solution. The temperature was 38.24 °C when TMRad is 24 h ( T D24 ). The evaluation results of the process showed that the risks of reactions with NaOH solution or NH 4 HCO 3 solution were not acceptable. Only the risk of the reaction with Na 2 CO 3 solution was acceptable. Therefore, the safety level of synthesis of benzoyl peroxide can be significantly improved by using Na 2 CO 3 solution. Research in this paper can not only improve the safety level of BPO reaction and storage processes, but also provide technical support for stability criterion of BPO decomposition reaction.