Effect of 1-Butyl-1-methylpyrrolidinium trifluoromethanesulfonate on water activity of ternary aqueous ionic liquid solutions containing [BMIm]Br, [BMIm]Cl, [HMIm]Br, and [HMIm]Cl, at 298.15 K

Abstract

In improved isopiestic method, the effect of 1-butyl 1-methylpyrrolidinium trifluoromethanesulfonate ([BMP][TfO]) on the activity of water of aqueous solutions of 1-butyl 3-methyl imidazolium bromide ([BMIm]Br), 1-butyl 3-methyl imidazolium chloride ([BMIm]Cl), 1-hexyl 3-methyl imidazolium bromide ([HMIm]Br), and 1-hexyl 3-methyl imidazolium chloride ([HMIm]Cl) was determined. Some quantities of vapor liquid equilibrium were calculated from the experimental values. The activity coefficients of [BMIm]Br, [BMIm]Cl, [HMIm]Br, and [HMIm]Cl in binary and ternary systems were calculated by the results obtained from correlating the activity of water measured in these systems with TNRF-mNRTL local composition based model. Through it, the transfer of these ionic liquids from water to aqueous ternary solutions containing [BMP][TfO] was investigated with respect to the transfer Gibbs energy. The interactions between solute and solvent were highlighted using the transfer Gibbs energy, water activity and partial pressure of water data.