Densities, Excess Volumes, Isobaric Expansivities, and Isothermal Compressibilities of the 1-Ethyl-3-methylimidazolium Ethylsulfate + Ethanol System at Temperatures (283.15 to 343.15) K and Pressures from (0.1 to 35) MPa

Densities of pure 1-ethyl-3-methylimidazolium ethylsulfate ionic liquid, [C 2 mim][EtSO 4 ], and its mixtures with ethanol have been measured with an accuracy of ± 0.2 kg·m ―3 , over the temperature range of (283.15 to 343.15) K and pressure range of (0.1 to 35) MPa, using a vibrating tube densimeter. The experimental densities have been correlated by the Tait equation with the temperature-dependent parameters (for the pure ionic liquid) and by a van Laar type equation, involving parameters dependent on temperature and pressure (for the mixtures). Excess volumes have been derived directly from the experimental densities, and isobaric expansivities, isothermal compressibilities, and related excess properties have been calculated with the use of the correlation equation. The exceptionally strong influence of pressure and temperature on these properties has been confirmed.