Reaction mode on the green construction process and corresponding thermal stability evaluation of ionic liquid

Ionic liquids (ILs) can be used as building materials, such as ILs polymers. Thermal stability is the basic attribute of selecting the most suitable high-temperature lubricant, fluid, and solvent compound for high-temperature organic reactions. The related literatures showing the thermal hazard of ILs at high temperature have been explored, but the analysis basis and evaluation reaction mode are lacking. This study combines reliable literature values of reaction parameters that no need for considering the complexity of reaction mode and nonlinear fitting that can calculate advanced reaction mode to follow the past literature flow and establish subsequent hazardous properties on ILs. A frequently used ILs, 1-butyl-3-methylimidazolium nitrate ([Bmmim]NO3), was selected and measured by thermogravimetric analyzer. The weight loss data recorded by the instrument are combined with the thermodynamic equation to ascertain the reaction kinetics of [Bmmim]NO3. The kinetics is described the changes and trends of the overall reaction on which the influence of external temperature is brought into reaction system. The numerical model is constructed to evaluate the thermal hazards of a large number of substances in the actual environment with different container forms in 25.0 g and 50.0 g packages. The results show that [Bmmim]NO3 has briefer period (< 1 h) for maximum reaction rate when the temperature is higher than 300 degrees C. The safety temperature of the reaction rate change is higher, and the temperature change of the runaway reaction is similar to that of the previous literature, respectively. Even the emergency response temperature range of the reaction rate is wider, attention should still be paid to the hazard of the runaway reaction at high temperature (> 270 degrees C).

Automated summary

This study investigates the thermal stability and hazards of ionic liquids at high temperatures. By measuring the thermogravimetric data of a frequently used IL, 1-butyl-3-methylimidazolium nitrate ([Bmmim]NO3), a numerical model is established to evaluate the thermal hazards under different conditions. The results show that [Bmmim]NO3 has a shorter duration for maximum reaction rate at high temperatures, and the temperature changes of the runaway reaction are similar to previous studies.