Thermal decomposition characteristics and potential hazards of three new ionic liquids of alkyl imidazoline hexafluoroph
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Thermal decomposition characteristics and potential hazards of three new ionic liquids of alkyl imidazoline hexafluorophosphates by TG and ARC Shang‑Hao Liu1,2 · Xi‑Zhan Zhang2 · Bin Zhang2 · Hong Su2 · Bin Laiwang3 Received: 28 May 2020 / Accepted: 8 October 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract Imidazoline ionic liquids (IMILs) because of its unique performance in the synthesis, liquid phase extraction environment, energy and other fields have broad application prospects, for the safety of the unknown material, study the thermal decomposition characteristics and potential hazards is very necessary. The purpose of this study was to evaluate the risk of three IMILs during production, transportation, storage, and application using thermogravimetry (TG) and accelerating rate calorimeter (ARC). The influence of different lengths of alkyl substituents on ILs stability was systematically analyzed. The apparent activation energy (Ea) and pre–exponential factor (A) of IMILs were calculated by Flynn–Wall–Ozawa (F–W–O) and Coats–Redfern (C–R) methods. Then, the mechanical function of their decomposition reaction was obtained by using the C–R method. The kinetic compensation effect is discussed. Finally, according to the experimental data under adiabatic condition by accelerating rate calorimeter (ARC), it is proved that the runaway reaction of the three IMILs is slow. This study confirms the low potential harmfulness of the above three microorganisms, gives their safe temperature range, and provides a reference for their safe use. Keywords Thermal stability · Thermal hazard risk · DSC · Imidazoline ionic liquids · Thermal hazard · Thermokinetic parameter
Introduction In recent years, more and more scholars are interested in the research and application of functional ionic liquids (FILs). ILs are room-temperature molten salts composed entirely of cation and anion [1]. They are widely used in extraction, synthesis, catalysis, electrochemistry, and * Shang‑Hao Liu [email protected] * Bin Laiwang [email protected] 1
State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology (AUST), Huainan 232001, Anhui, China
2
School of Chemical Engineering, AUST, Huainan 232001, Anhui, China
3
Graduate School of Engineering Science and Technology, National Yunlin University of Science and Technology, 123, University Rd., Sec. 3, Douliou 64002, Yunlin, Taiwan, ROC
other fields because of their special physical and chemical properties [2, 3], such as high solubility to organic and inorganic substances [4], wide liquid range [5], extremely vapor pressure [6] and good conductive properties [7]. The physicochemical properties of FILs often change greatly within the combination of anion and cation. By studying the relationship between functional groups and their physicochemical properties in ionic liquid, ionic liquid with special properties and special functions can be designed and synthesized according to the needs in practical
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