Effects of incompatible substances on thermal stability of dimethyl 2,2′-azobis(2-methylpropionate) (AIBME) in the application process

Nengcheng Zhou, Min Hua, Andong Yu, Weijun Wang, Xuhai Pan, Chenye Wei, Juncheng Jiang

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Abstract

Dimethyl 2,2′-azobis (2-methylpropionate) (AIBME) is an oil-soluble azo initiator whose nature is unstable. In the chemical process, acids, alkalines or catalysts are often added to catalyze reactions. However, the decomposition process of the azo compounds may change when it is in contact with incompatible substances. In order to investigate the effects of common substances (hydrochloric acid (HCl), sodium hydroxide (NaOH), iron oxide (Fe2O3)) on the thermal stability of AIBME, differential scanning calorimetry (DSC) was utilized to obtain thermodynamic parameters. The dynamic calculations were carried out by Kissinger and Ozawa method. Meanwhile, adiabatic calorimeter Phi-TEC II was used to simulate the occurrence of thermal runaway of AIBME mixed with three incompatible substances under adiabatic conditions. Based on the adiabatic kinetic analysis, temperature at the time to maximum rate for 8 h (TD8) and 24 h (TD24) were obtained. Self-accelerating decomposition temperature (SADT) was calculated by the Semenov thermal spontaneous combustion theory. Non-isothermal experimental results showed that HCl reduced the activation energy of AIBME and increased its potential risk, while NaOH and Fe2O3 had inverse effect. In the adiabatic decomposition process, HCl and NaOH decreased the adiabatic temperature rise (ΔTad) of AIBME, but Fe2O3 had less influence. In addition, calculations for SADT of mixtures indicated that a low temperature environment should be provided for storage and transportation.

Original languageEnglish
Article number104478
JournalJournal of Loss Prevention in the Process Industries
Volume71
DOIs
StatePublished - Jul 2021

Keywords

  • Adiabatic calorimeter phi-TEC II
  • Chemical process
  • Differential scanning calorimetry (DSC)
  • Dimethyl 2,2′-azobis(2-methylpropionate) (AIBME)
  • Thermal stability

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