Vapor−liquid equilibria for the binary system ethyl acetate + acetonitrile and for the ternary system ethyl acetate + acetonitrile + 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM] + [PF 6 ] − ) at 101.3 kPa have been obtained with a modified Othmer still. The experimental vapor−liquid equilibrium data were correlated using the NRTL model proposed by Renon and Prausnitz, and the parameters were obtained. The results showed that [BMIM] + [PF 6 ] − produced a consistent salting-out effect of ethyl acetate over the whole range of the liquid concentrations, which increased the relative volatility of ethyl acetate to acetonitrile and even eliminated the azeotropic phenomenon when the mole fraction of [BMIM] + [PF 6 ] − was up to 0.05.
Isobaric vapor−liquid equilibrium (VLE) data for methanol−methyl ethyl ketone (MEK) systems containing ionic liquids (ILs) have been measured with a modified Othmer still at atmospheric pressure (101.32 kPa), and they were correlated by the NRTL equation. Three ILs, composed of an anion tetrafluoroborate ([BF4] − ) and a cation from 1-ethyl-3-methylimidazolium ([EMIM] + ), over 1-butyl-3-methylimidazolium ([BMIM] + ), to 1-octyl-3-methylimidazolium ([OMIM] + ), were investigated, and they all gave rise to a change of the relative volatility of methanol to MEK. The results indicated that, among the three ILs studied, [BMIM] + [BF 4 ] − and [OMIM] + [BF 4 ] − eliminated the azeotropic point at mole fraction 30 % and 10 %, respectively, whereas IL [EMIM] + -[BF 4 ] − pulled down the azeotropic point. The influence of the variation of the cation's alkyl chain length of imidazolium tetrafluoroborate-based ILs on VLE of the azeotropic system methanol−MEK was discussed.
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