Pressure−Density−Temperature (p−ρ−T) Surface of [C6mim][NTf2]

In the framework of the IUPAC Project entitled “Thermodynamics of ionic liquids, ionic liquid mixtures, and the development of standardized systems”, 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide, [C 6 mim][NTf 2 ], was selected as the standard ionic liquid on which to perform round-robin measurements on a series of selected properties. In this work, the pressure, density, temperature ( p, ρ, T ) surface was determined in the temperature range (293 to 338) K and up to a nominal pressure of 65 MPa. The isothermal compressibility and isobaric expansion coefficients were calculated from the ( p, ρ, T ) data.