Abstract
This article describes thermal risk assessment of vegetable oil epoxidation by peroxycarboxylic acid. It is a liquid-liquid system where several exothermic reactions occur. Acetic acid was used as the carboxylic acid, and oleic acid was chosen as a model molecule because it is a common fatty acid in the triglyceride molecule. Differential scanning calorimetry (DSC) and accelerating rate calorimetry (ARC) were used to determine safety criteria such as the final temperature (T Final), T D24, and time to maximum rate under adiabatic condition (TMRad). We found that the calculation of TMRad based on DSC data could be incorrect when assuming a zero-order kinetic reaction. By using a process temperature of 70 °C, the extrapolated final temperature was found to be 544 °C from DSC experiments, T D24 was estimated to 20 °C based on ARC experiment, and TMRad was calculated to 164 min from ARC experiments. These criteria indicate the process can lead to a thermal runaway. Therefore, we recommend that vegetable oil epoxidation by peroxycarboxylic acid should not be performed in batch reactor, but in semi-batch mode.
Original language | English |
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Pages (from-to) | 795-804 |
Number of pages | 10 |
Journal | Journal of Thermal Analysis and Calorimetry |
Volume | 122 |
Issue number | 2 |
DOIs | |
Publication status | Published - 20 Jun 2015 |
Keywords
- Adiabatic temperature rise
- Green chemistry
- MTSR
- Thermal risk assessment
- Time to maximum rate under adiabatic condition TMR<inf>ad</inf>