1 research outputs found
Phase Equilibrium, Excess Enthalpies, and Densities of Binary Mixtures of Trimethylbutylammonium Bis(trifluoromethylsulfonyl)imide with Ethanol, 1‑Propanol, and Dimethylformamide
The
molecular interactions between the ionic liquid trimethylbutylammomium
bisÂ(trifluoromethylsulfonyl)Âimide, [N<sub>1114</sub>]Â[Tf<sub>2</sub>N], and three common solvents, including short chain alcohols (ethanol
and 1-propanol) and an aprotic solvent (<i>N,N</i>-dimethylformamide
or DMF) were investigated through experimental properties. The excess
enthalpies were measured by calorimetry at temperatures from 308.15
K to 323.15 K over the whole composition range and excess volumes
were calculated from density measurements. The vapor–liquid
equilibrium (VLE) measurements of the [N<sub>1114</sub>]Â[Tf<sub>2</sub>N] + DMF mixture were obtained using a headspace gas chromatography
instrument. It was determined that hydrogen bonds between the alcohol
molecules contribute to the positive excess enthalpies, while the
favorable interactions between DMF and [N<sub>1114</sub>]Â[Tf<sub>2</sub>N] might be explained by electrostatic interactions between the ionic
liquid and the zwitterionic resonance structure of DMF. The nonrandom
two liquid (NRTL) equation was successfully used to correlate the
excess enthalpy and VLE results