(p,ρ,T) data of 1-butyl-3-methylimidazolium hexafluorophosphate

Abstract

Herein, experimental pressure-density-temperature (p,ρ,T) data of 1-butyl-3-methylimidazolium hexafluorophosphate, [BMIM][PF6], are reported over a wide range of temperatures T = (278.15 to 413.15) K and pressures p = (0.101 to 140) MPa. These measurements were carried out using an Anton Paar DMA HPM vibrating tube densimeter. (p,ρ,T) data of [BMIM][PF6] were correlated with a designed equation of state (EoS). After a thorough analysis of the validity of the constructed EoS, various thermophysical properties such as: isothermal compressibility, isobaric thermal expansivity, differences in isobaric and isochoric heat capacities, thermal pressure coefficient, internal pressure, heat capacities at constant pressure and volume, speed of sound and isentropic exponent were then calculated. Finally, the predictive capability of various models available in the literature was then tested by using the collected (p,ρ,T) data to highlight the best approach to be used to evaluate the volumetric properties of the selected ionic liquid.