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

ABSTRACT

The experimental data of viscosity and density for six binary mixtures of water (methanol or ethanol) with an ionic liquid, 1-butyl-3-methylimidazolium dimethylphosphate ([BMIM][DMP]) or 1-ethyl-3-methylimidazolium dimethylphosphate ([EMIM][DMP]), were measured in the temperature range of (293.15 to 333.15) K at atmospheric pressure using the viscometer and densimeter. The solution behavior of the mixtures is discussed in terms of the variation of the excess viscosity and excess volume with temperatures and compositions. It is found that both excess volume and viscosity of the mixtures studied show a negative deviation from the ideal solution behavior, the viscosity of the mixtures decreases drastically with the increase of temperatures and mole fractions of solvents. The excess volume of the binary mixtures is quite low being in the range of (1.0 to 1.9) cm3.mol-1, moreover, it shows a monotonic decrease with increasing temperature for the aqueous solution of ILs, and a reverse trend for the IL solutions of methanol or ethanol at any concentrations.