Abstract
Vapor pressure data for ternary systems ethanol + methanol + [MMIM][DMP] (1-methyl-3-methylimidazolium dimethyl phosphate), ethanol + methanol + [EMIM][DEP] (1-ethyl-3-methylimidazolium diethyl phosphate), ethanol + methanol + [BMIM][DBP] (1-butyl-3-methyl imidazolium dibutyl phosphate), and ethanol + water + [MMIM][DMP] were measured at ionic liquid (IL) mass fraction of 50 % by a quasi-static method. The vapor pressure data were correlated with the NRTL model for nonelectrolyte solution, and the average absolute relative deviations of vapor pressure for the above systems were 0.55 %, 0.42 %, 0.67 %, and 1.68 %, respectively. On the basis of the predicted isothermal vapor−liquid equilibrium data for the ethanol + methanol and ethanol + water systems at 320 K and ionic liquid mass fraction of 50 %, it is found that all ILs show salting-out effect for ethanol. The salting-out effect follows the order [EMIM][DEP] > [MMIM][DMP] > [BMIM][DBP] for the ethanol + methanol system. Moreover, the azeotropic phenome...
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