Prediction of different thermodynamic properties for systems of alcohols and sulfate-based anion Ionic Liquids using modified UNIFAC

摘要

Activity coefficients at infinite dilution in the temperature range between 303.15K and 353.15K, vapor-liquid equilibria at 353.15K and excess enthalpies at 353.15K of binary systems containing the Ionic Liquids 1-ethyl-3-methyl-imidazolium ethylsulfate [EMIM]~+[EtSO_4]~-, 1-ethyl-3-methyl-imidazolium methylsulfate [EMIM]~+[MeSO_4]~- and 1-ethyl-3-methyl-imidazolium hydrogensulfate [EMIM]~+[HSO_4]~- have been measured. The obtained experimental data are used together with literature data to fit modified UNIFAC interaction parameters between the sulfate anion and the main groups OH and CH_3OH. The predictions are compared with the experimental values. Additionally an overview about the current status of the modified UNIFAC parameter matrix for Ionic Liquids is given.