Influence of Some Ionic Liquids Containing the Trifluoromethanesulfonate Anion on the Vapor-Liquid Equilibria of the Acetone plus Methanol System

Isobaric vapor liquid equilibria (VLE) for the binary systems acetone + 1-butyl-3-ethylimidazolium trifluoromethanesulfonate ([beim][triflate]), methanol + [beim] [triflate], acetone + 1-butyl-1-methylpyrrolidinium trifluoromethanesulfonate ([bmpyr] [triflate]), and methanol + [bmpyr] [triflate] as well as the VLE for the acetone + methanol + [beim] [triflate] and acetone + methanol + [bmpyr] [triflate] ternary systems have been obtained at 100 kPa using a recirculating still. The addition of both ionic liquids to the solvent mixtures produced an important salting-out effect, and the azeotrope tended to disappear for small amounts of ionic liquid. The experimental binary data sets were independently fitted with the electrolyte nonrandom two-liquid (NRTL) model, and the parameters of the Mocks model were estimated for each binary system. These parameters were used to predict the ternary VLE, which agreed very well with the experimental ones.