Chloroaluminate Equilibria in the Aluminum Chloride‐1‐Methyl‐3‐ethylimidazolium Chloride Ionic Liquid

Abstract

The stoichiometric equilibrium constant, K′ , for the autosolvolysis reaction for the aluminum chloride‐1‐methyl‐3‐ethylimidazolium chloride ionic liquid was investigated as a function of temperature with a chloroaluminate concentration cell and aluminum electrodes. The values obtained at 40°, 50°, and 60°C for logK′ were −16.3±0.1 , −16.1±0.6 , and −15.5±0.2 . The enthalpy change for the autosolvolysis reaction was found to be approximately 80 kJ · mol−1 over this temperature range. A curve fitting method for determining the initial composition of this ionic liquid during a titration is also described.

Electrochemical Windows of Room‐Temperature Ionic Liquids

“…The potential differences between these two REs is not very large (130 $ 180 mV), and it can be obtained from the reported potentiometric titration curve, if available [22][23][24]26]. Figure 4.5 shows the EWs of various chloroaluminate systems, excluding the potential differences in the RE.…”

Ionic liquids. Green solvents for the future

“…Examples of ionic liquids consisting of a simple salt are given in show simple melting behavior. For the binary systems, the melting point depends upon composition,* and this complex behavior has been studied extensively for the archetypal system, [emim]Cl-AlCl 3 ([emim] + = 1-ethyl-3-methylimidazolium) [9]. Ionic liquids have been described as designer solvents [1], and this means that their properties can be adjusted to suit the requirements of a particular process.…”

Some physicochemical characteristics of molten salts derived from trimethylsulfonium bromide

“…Liquids are obtained for AICI, mole fractions ranging from 0.37 to 0.67 for the former and from 0.33 to 0.67 for the latter. Potentiometry suggests (3,4) that acid-base properties of these melts are governed by tetrachloroaluminate dissociation with Keg at 40°C. Some formation of Al,CI,{ may be important at high (>64 mol%) AICl, mole fractions (5,6).…”