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

ABSTRACT

In this paper we present densities, viscosities and speed of sound of pure and binary mixtures of three ionic liquids triethylsulfonium bis(trifluoromethylsulfonyl)imide, [Et3S][TFSI], 1-allyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, [Amim][TFSI], and 1,3-dihydroxyimidazolium bis(trifluoromethylsulfonyl)imide, [(OH)2Im][TFSI], with 1-propanol from (293.15 to 343.15) K at 0.1 MPa. We also include densities, viscosities and speed of sound of pure ionic liquid 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide for validation. Densities and speed of sound are measured using a vibrating tube densimeter while viscosities are from a pellet microviscometer. The density and viscosity of pure ionic liquids are correlated by means of the Gardas and Coutinho and Vogel-Tammann-Fulcher equations, respectively. From the speed of sound measurements, we obtain isentropic compressibility, speed of sound deviation and isentropic compressibility deviation for mixtures of ionic liquids and 1- propanol. Excess molar volumes and viscosity deviations are calculated from the experimental data. The excess molar volumes for the binary mixtures with [Et3S][TFSI] and [Amim][TFSI] present positive and negative deviations from ideality while for the binary mixture with [(OH)2Im][TFSI] exhibits only negative deviations. Viscosity deviations for [Et3S][TFSI] + 1-propanol, [Amim][TFSI] + 1-propanol and [(OH)2Im][TFSI] + 1-propanol are negative over the entire temperature range. Speed of sound deviations are positive and negative for the binary mixtures of 1-propanol with [Et3S][TFSI] and [Amim][TFSI] whereas for the mixture with [(OH)2Im][TFSI] are negative. Corresponding author *Tel: 011 52 443 327 3584. Email address: mramos@umich.mx