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

ABSTRACT

Four ionic liquids, [bmpyr][Tf2N] (1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide), [amim][Tf2N] (1-allyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide), [emim][TCB] (1-ethyl-3-methylimidazolium tetracyanoborate) and [hmim][TCB] (1-hexyl-3-methylimidazolium tetracyanoborate), were studied. High-pressure densities were measured at pressures up to 200 MPa and at temperatures of (293 413) K. Densities and viscosities at atmospheric pressure were measured over a temperature range of (293 373) K, and average relative deviation (ARD) of correlation with Vogel-Fulcher-Tammann equation for viscosity were within 0.08 %. Correlation of the density data with the Tait equation could be obtained to within 0.02 % ARD. Isobaric expansivities calculated from the Tait equation were constant or decreased slightly with increasing temperature in accordance with trends commonly reported for ionic liquids. Parameters for the a*-modified Sanchez-Lacombe equation of state are tabulated that allow correlation of the ionic-liquid highpressure densities to within an ARD of less than 0.08 %.