Phase behaviors of 1-Butyl-3-methylimidazolium hexafluorophosphate+water+alcohol systems

Abstract

The phase behaviors of 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim] [PF6]) + water+methanol, [bmim][PF6]+water+ethanol, [bmim][PF6]+water+2-propanol, and [bmim][PF6]+water+1- propanol ternary systems were determined at 298.15 K and ambient pressure. It was demonstrated that when the mole fractions of the alcohols in the water+alcohol solutions were 0.55-1.00, 0.40-0.75, and 0.35-0.50 for methanol, ethanol, and 2-propanol, respectively, the [bmim][PF6] was totally dissolved in the aqueous alcohol solutions due to a strong co-solvent effect. However, water+1-propanol did not exhibit this kind of behavior. Both the size and structure of the alcohols significantly affected the phase behaviors of the ternary systems. © Editorial office of Acta Physico-Chimica Sinica.