Evaporation Study of an Ionic Liquid with a Double-Charged Cation

Abstract

The evaporation of a dicationic ionic liquid, 1,3-bis(3-methylimidazolium-1-yl)propane bis(trifluoromethanesulfonyl)amide ([C(MIm)][TfN]), was studied by Knudsen effusion mass spectrometry. Its evaporation is accompanied by a partial thermal decomposition producing monocationic ionic liquids, 1,3-dimethylimidazolium and 1-(2-propenyl)-3-methylimidazolium bis(trifluoromethanesulfonyl)amides, as volatile products. This decomposition does not affect the vaporization characteristics of [C(MIm)][TfN], which were established to be as follows. The vaporization enthalpy (550 K) is equal to (155.5 ± 3.2) kJ·mol; the saturated vapor pressure is described by the equation ln( p/Pa) = -(18699 ± 381)/( T/K) + (30.21 ± 0.82) in the range of 508-583 K. 1,3-Bis(3-methylimidazolium-1-yl)propane bis(trifluoromethanesulfonyl)amide is the first dicationic ionic liquid, the vaporization characteristics of which were determined with an acceptable accuracy.

Decomposition of Fluorinated Ionic Liquids to Fluoride Ions Using Superheated Water: An Efficient Approach for Recovering Fluorine from the Waste of Fluorinated Ionic Liquids

“…There were several reports on the thermal degradation of F-ILs. [12][13][14][15] However, the majority of these works have described the aging of the F-ILs in view of battery performance. We would like to stress that the extent of degradation that lowers battery performance is considerably smaller than that required for efficient waste treatment.…”

Complete Mineralization of Fluorinated Ionic Liquids in Subcritical Water in the Presence of Potassium Permanganate

“…Thus the development of an improved method for the mineralization of fluorinated ILs could contribute to the recycling of fluorine element, which is an element with increasing global demand . Although the literature contains at least a dozen reports on the degradation of fluorinated ILs, − most of these previous studies have examined the electrochemical − ,− ,, or thermal stability ,,, of fluorinated ILs in the context of battery performance, and the level of degradation that reduces battery performance is substantially lower than that required for effective waste treatment. Furthermore, regarding the degradation of the anion moiety of fluorinated ILs, most electrochemical studies focused on reductive degradation.…”