Influence of oxidizing gas atmosphere on thermal stability and safety risk of 1-buty-3-methylimidazolium tetrafluoroborate
1-Butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF 4 ) is often used as an extractive desulfurization of liquid fuels. However, the role of air and nitrogen atmospheres on thermal effect of [Bmim]BF 4 has been shown to the opposite. Thus, the effect of oxidizing gases on thermal stability and s...
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Published in | Journal of thermal analysis and calorimetry Vol. 148; no. 11; pp. 4717 - 4727 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Cham
Springer International Publishing
01.06.2023
Springer Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | 1-Butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF
4
) is often used as an extractive desulfurization of liquid fuels. However, the role of air and nitrogen atmospheres on thermal effect of [Bmim]BF
4
has been shown to the opposite. Thus, the effect of oxidizing gases on thermal stability and safety risk of [Bmim]BF
4
is worth further investigation. In this study, the thermal stability, decomposition mechanism, and thermal hazards of [Bmim]BF
4
were studied by thermogravimetric (TG), simultaneous application of thermogravimetric with a Fourier transform infrared spectroscopy (TG-FTIR), and accelerated adiabatic calorimetry (ARC). Obtained by thermogravimetric experiments, the long-term thermal stability of [Bmim]BF
4
is
MOT
8000
= 92 ℃ under air and
MOT
8000
= 112 ℃ under nitrogen. TG-FTIR shows that the decomposition mechanism is different in the two atmospheres; CO
2
is only produced under air, indicating that the decomposition products of [Bmim]BF
4
undergo combustion and release huge heat, which explains the exotherm of DSC images in air. In adiabatic experiments, different atmospheres affect the decomposition reaction order of [Bmim]BF
4
. Nitrogen suppresses the thermal effect of [Bmim]BF
4
, because although the decomposition rate of [Bmim]BF
4
before runaway is much greater under nitrogen than under air, the maximum temperature and maximum pressure are still less than under air. The thermal stability, thermal effect, and adiabatic runaway of [Bmim]BF
4
in different atmosphere are a typical representations of ILs, which proves that oxidizing atmosphere has a great negative influence on thermal hazards of [Bmim]BF
4
. |
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ISSN: | 1388-6150 1588-2926 |
DOI: | 10.1007/s10973-022-11755-0 |