Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

In this paper, the influence of glycine on the thermodynamic properties of aqueous solutions containing ionic liquids 1-butyl-3-methylimidazolium chloride, [C4mim]Cl, 1-hexyl-3-methylimidazolium chloride, [C6mim]Cl, 1-butyl-3-methyl-imidazolium trifluoromethanesulfonate, [C4mim][CF3SO3], has been studied. For this purpose, firstly the water activity measurements by the vapour pressure osmometery (VPO) method have been performed on the ternary aqueous solutions of ([C4mim]Cl, [C6mim]Cl and [C4mim][CF3SO3] + glycine) at T = 308.15 K. The influence of the IL nature on the vapor- liquid equilibria behavior of the investigated systems has been studied. The VPO measurements of these systems show that due to the unfavorable IL-glycine interactions, the negative deviations from the semiideal state and therefore the soluting-out effects have been seen in these systems. The soluting-out phenomena appears by aqueous biphasic system formation in the case of aqueous [C4mim][CF3SO3] + glycine system and precipitation of the glycine from the solution in the case of ternary [C4mim]Cl/[C6mim]Cl + glycine + water systems. In the second part of this work, density and sound velocity of solutions of the ILs in pure water and aqueous glycine solutions have been determined at T = 288.15, 298.15, 308.15 and 318.15 K. These data were used to obtain the apparent molar volume, V., isentropic compressibility, K., and those in the infinite dilution.