Thermal decomposition characteristics and potential hazards of three new ionic liquids of alkyl imidazoline hexafluorophosphates by TG and ARC

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.