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Vapor pressure and liquid density of 1-butyl-3-methylimidazolium hexafluorophosphate and ammonia Mixtures
Daisuke Tomida, Yuki Tani, Kun Qiao and Chiaki Yokoyama

Vapor pressures and liquid densities for 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF6]) and ammonia (NH3) mixtures were measured over a wide range of temperatures (283.15 to 363.15 K) and mole fractions. The vapor pressures of the mixtures were measured with a static method. The measurement combined standard uncertainty in the vapor pressure was 0.25%−2.5%. The experimental values were compared with literature data and correlated with Antoine’s equation with an average absolute deviations of 1.85%. Liquid densities of the [BMIM][PF6] and NH3 mixtures were measured in the temperature range of 283.15−363.15K and a pressure range  of 10.0 to 30.0 MPa. Liquid densities were measured with a piezometer. The estimated combined standard uncertainty in the density was 0.1%. The experimental values were correlated with a Tait equation with an average absolute deviations of 0.06 %.

Keywords: Ammonia; Density; Ionic liquid; Mixture; Vapor pressure; High pressure

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