Experimental Study of the Thermal Decomposition Properties of Binary Imidazole Ionic Liquid Mixtures
Abstract
:1. Introduction
2. Experimental
2.1. Materials for Thermal Decomposition Experiments
2.2. Materials for Flash Point Experiments
2.3. Apparatus and Methods for Thermal Decomposition Experiments
2.4. Apparatus and Methods for Flash Ignition Experiments
3. Results and Discussion
3.1. The Thermal Decomposition Temperature of BIIL Mixtures
3.2. The Flash Ignition Temperatures of BIIL Mixtures
3.3. Correlation between Thermal Decomposition and the Flash Ignition Temperatures of BIIL Mixtures
4. Conclusions
- (1)
- When the proportion of less thermally stable components is high, the Td of the BIIL mixture is consistent with that of the less thermally stable components, which might promote intense combustible and toxic gases production. When the proportion of highly thermally stable components increases above 0.5, the Td of the mixtures gradually increases. That means, the thermal stability of the mixtures increases;
- (2)
- When the proportion of less thermally stable components is high, the Tf of the mixture is close to that of the less thermally stable components. This situation can easily induce a fire and explosion accident. As the proportion of the highly thermally stable components increases, the Tf of the mixture also increases. It is accordingly lower in thermal risk. When the proportion of the highly thermally stable component is ≥0.7, the Tf of the mixture is consistent with the Tf of the highly thermally stable component;
- (3)
- In the cases of most molar ratios, the flash ignition of BIIL mixtures depends on the first stage of the thermal decomposition process. As the proportion of highly thermally stable components increases, the Tf of the IL mixtures increases. When the highly thermally stable component has a high proportion ≥ 0.7, the Tf is in the second stage of the thermal decomposition process.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
Sample Availability
References
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No. | Name | Abbreviation | Cation | Anion Structure | |
---|---|---|---|---|---|
Structure | Stability | ||||
1 | 1-butyl-3-methylimidazolium tetrafluoroborate | [BMIM][BF4] | | Stable | |
2 | 1-butyl-3-methylimidazolium trifluoromethanesulfonate | [BMIM][TFO] | | Stable | |
3 | 1-butyl-3-methylimidazolium nitrate | [BMIM][NO3] | | Stable | |
4 | 1-butyl-3-methylimidazolium trifluoroacetate | [BMIM][CF3COO] | | Stable | |
5 | 1-butyl-imidazolium nitrate | [BIM][NO3] | | Unstable | |
6 | 1-butyl-2,3-dimethylimidazolium nitrate | [BMMIM][NO3] | | Very stable | |
No. | BIIL Mixtures | Cation | Anion |
---|---|---|---|
1 | [BIM]x[BMIM](1−x)[NO3]x | [BIM]+, [BMIM]+ | [NO3]− |
2 | [BIM]x[BMMIM](1−x)[NO3]x | [BIM]+, [BMMIM]+ | [NO3]− |
3 | [BMIM]x[BMMIM](1−x)[NO3]x | [BMIM]+, [BMMIM]+ | [NO3]− |
4 | [BMIM][NO3]x[TFO](1−x) | [BMIM]+ | [NO3]−, [TFO]− |
5 | [BMIM][NO3]x[BF4]x | [BMIM]+ | [NO3]−, [BF4]− |
6 | [BMIM][NO3]x[CF3COO]x | [BMIM]+ | [NO3]−, [CF3COO]− |
7 | [BMIM][BF4](1−x)[TFO](1−x) | [BMIM]+ | [BF4]−, [TFO]− |
8 | [BMIM][CF3COO]x[TFO](1−x) | [BMIM]+ | [CF3COO]−, [TFO]− |
9 | [BIM]x[BMIM](1−x)[NO3]y[TFO](1−y) | [BIM]+, [BMIM]+ | [NO3]−, [TFO]− |
10 | [BIM]x[BMIM](1−x)[NO3]y[BF4](1−y) | [BIM]+, [BMIM]+ | [NO3]−, [BF4]− |
No | Name | Abbreviation | Cation | Anion Structure | |
---|---|---|---|---|---|
Structure | Stability | ||||
1 | 1-butyl-imidazolium nitrate | [BIM][NO3] | | Unstable | |
2 | 1-butyl-3-methylimidazolium nitrate | [BMIM][NO3] | | Stable | |
3 | 1-butyl-2,3-dimethylimidazolium nitrate | [BMMIM][NO3] | | Very stable | |
4 | 1-butyl-3-methylimidazolium acetate | [BMIM][OAC] | | Stable | |
5 | 1-butyl-3-methylimidazolium dicyanamide | [BMIM][DCA] | | Stable | |
6 | 1-butyl-3-methylimidazolium trifluoroacetate | [BMIM][CF3COO] | | Stable | |
No | BIIL Mixtures | Cation | Anion |
---|---|---|---|
1 | [BIM]x[BMIM](1−x)[NO3](1−x) | [BIM]+, [BMIM]+ | [NO3]− |
2 | [BIM]x[BMMIM](1−x)[NO3](1−x) | [BIM]+, [BMMIM]+ | [NO3]− |
3 | [BMIM]x[BMMIM](1−x)[NO3](1−x) | [BMIM]+, [BMMIM]+ | [NO3]− |
4 | [BMIM][NO3]x[OAC](1−x) | [BMIM]+ | [NO3]−, [OAC]− |
5 | [BMIM][NO3]x[DCA](1−x) | [BMIM]+ | [NO3]−, [DCA]− |
6 | [BMIM][NO3]x[CF3COO](1−x) | [BMIM]+ | [NO3]−, [CF3COO]− |
7 | [BMIM]x[BMMIM](1x)[NO3]y[CF3COO](1−y) | [BMIM]+, [BMMIM]+ | [NO3]−, [CF3COO]− |
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Yang, F.; Zhang, X.; Pan, Y.; He, H.; Ni, Y.; Wang, G.; Jiang, J. Experimental Study of the Thermal Decomposition Properties of Binary Imidazole Ionic Liquid Mixtures. Molecules 2022, 27, 1357. https://doi.org/10.3390/molecules27041357
Yang F, Zhang X, Pan Y, He H, Ni Y, Wang G, Jiang J. Experimental Study of the Thermal Decomposition Properties of Binary Imidazole Ionic Liquid Mixtures. Molecules. 2022; 27(4):1357. https://doi.org/10.3390/molecules27041357
Chicago/Turabian StyleYang, Fan, Xin Zhang, Yong Pan, Hongpeng He, Yuqing Ni, Gan Wang, and Juncheng Jiang. 2022. "Experimental Study of the Thermal Decomposition Properties of Binary Imidazole Ionic Liquid Mixtures" Molecules 27, no. 4: 1357. https://doi.org/10.3390/molecules27041357