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Thermal hazard analysis and combustion characteristics of four imidazolium nitrate ionic liquids

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Abstract

Thermogravimetry and differential scanning calorimetry (DSC) were used to investigate the thermal stability of four nitrate-based ionic liquids. The variations of thermal behavior for different numbers or lengths of alkyl substituents for imidazolium cations were analyzed systematically. Long-term stability and operating temperature for 1.0% mass loss during 10 h (T0.01, 10 h) were estimated using model-free perdition methodologies. The results of T0.01, 10 h were predicted to be 78.73 and 81.59 °C for [Bim][NO3] and [Mim][NO3], respectively. The apparent activation energy (Ea) was obtained using four isoconversional methods at various heating rates through DSC experiments. This study confirmed that [Bim][NO3] and [Mim][NO3] decomposed swiftly, and the gaseous products can result in ignition and continuous combustion.

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Abbreviations

A(α):

Pre-exponential factor (s−1)

\(\alpha\) :

Degree of conversion (dimensionless)

\(\beta\) :

Heating rate (°C min−1)

E a :

Apparent activation energy (kJ mol−1)

f(α):

Most probable kinetic function (dimensionless)

\(\it {\text{G}}\left( \alpha \right)\) :

Integral mechanism function (dimensionless)

ΔH d, avg :

Average heat of decomposition (J g−1)

R :

Universal gas constant (8.31415 J K−1 mol−1)

T :

Temperature (°C)

T 0.01, 10 h :

Temperature at mass loss reaches 1.0% for 10 h (°C)

t :

Time (min)

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Acknowledgements

The authors are indebted to the Ministry of Science and Technology (MOST) in Taiwan under the Contract Number 104-2622-E-224-009-CC2 for financial support, as well as the Department of Natural Sciences Key Fund, Bureau of Education, Anhui Province, China, for its financial support under Contract Number KJ2017A078.

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Authors and Affiliations

  1. Graduate School of Engineering Science and Technology, National Yunlin University of Science and Technology (YunTech), Yunlin, 64002, Taiwan, ROC

    Wei-Cheng Lin

  2. Department of Industrial Education and Technology, National Changhua University of Education, Changhua, 50074, Taiwan, ROC

    Wen-Lung Yu

  3. Department of Ammunition Engineering and Explosion Technology, Anhui University of Science and Technology, Huainan, 232001, Anhui, China

    Shang-Hao Liu

  4. Department of Safety, Health, and Environmental Engineering, YunTech, Yunlin, 64002, Taiwan, ROC

    Shih-Yu Huang & Chi-Min Shu

  5. Department of Occupational Safety and Health, Jen-Teh Junior College of Medicine, Nursing and Management, Miaoli, 35665, Taiwan, ROC

    Hung-Yi Hou

  6. Center for Process Safety and Industrial Disaster Prevention, YunTech, Yunlin, 64002, Taiwan, ROC

    Chi-Min Shu

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  1. Wei-Cheng Lin
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Correspondence to Shang-Hao Liu.

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Lin, WC., Yu, WL., Liu, SH. et al. Thermal hazard analysis and combustion characteristics of four imidazolium nitrate ionic liquids. J Therm Anal Calorim 133, 683–693 (2018). https://doi.org/10.1007/s10973-018-7319-3

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  • DOI: https://doi.org/10.1007/s10973-018-7319-3

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