Thermal Decomposition Behavior of Benzoyl Peroxide in Presence of Different Impurities
In this work,a combined experimental and theoretical approach was used to systematically investigate the exothermic characteristics of benzoyl peroxide(BPO)and the effects of sulfuric acid(H2SO4)and sodium hydroxide(NaOH)on its exothermic behavior.Firstly,the thermal runaway risks of different systems were investigated in detail by differential scanning calorimetry(DSC)and accelerating rate calorimetry(ARC)to identify and quantify thermal hazards and characterize their decomposition reactions.On this basis,the thermal hazard levels were evaluated by the Zurich Hazard Analysis(ZHA)standard.Secondly,modeling methods such as KAS method and FWO were employed to solve the kinetic parameters to further elucidate the intrinsic properties of pyrolysis.Additionally,the composition of pyrolysis products was characterized via gas chromatography-mass spectrometry(GC-MS)and supplemented with quantum chemical calculations to infer the pyrolysis pathway of BPO in order to reveal the intrinsic mechanism of the influence of impurities on the pyrolysis of BPO.The results indicate that the decomposition of BPO is autocatalytic in nature.And the introduction of H2SO4 and NaOH sequentially improves the thermal stability of BPO and reduces the total heat release,but significantly shortens the duration of the adiabatic induction period and increased the potential for thermal runaway.H2SO4 and NaOH altered the pyrolysis pathway of BPO,and toluene and phenol products were the intrinsic cause of further accelerated pyrolysis of BPO.This study can provide more precise theoretical guidance for practical application.
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