Densities at pressures up to 20 MPa and thermal conductivities at 0.1 MPa of 1-butyl-3-methylimidazolium tetrafluoroborate + methanol mixtures
Daisuke Tomida, Tsuyoshi Odashima, Kun Qiao and Chiaki Yokoyama
In this study, we report densities and thermal conductivities for 1-butyl- 3-methylimidazolium tetrafluoroborate + methanol mixtures. The densities were measured using a vibrating tube densimeter over the temperature range 293–333 K and at pressures up to 20 MPa. The expanded uncertainty in the density measurements was 0.22% (k = 2). The experimental values were correlated with a Tait equation with an average absolute deviation of 0.10%. The transient short hot-wire method was used to measure the thermal conductivities over the temperature range 295–335 K at 0.1 MPa. The expanded uncertainty in the thermal conductivity measurements was 4.4%. The thermal conductivities of the 1-butyl-3-methylimidazolium tetrafluoroborate + methanol mixtures increased in an approximately quadratically with increasing methanol mass fraction. The experimental values were correlated with a Jamieson equation with an average absolute deviation of 0.24%.
Keywords: 1-Butyl-3-methylimidazolium tetrafluoroborate, Density, Ionic liquid, Methanol, Thermal conductivity, Transient short hot-wire, High Pressure