Gibbs Free Energy Equation of State for Phase I of Solid Benzene from 15 to 488 K and up to 1165 MPa

The functional form developed in Stringari , J. Chem. Eng. Data 2021, 66 2 1157–1171 has been applied for obtaining a Gibbs free energy equation of state (EoS) for phase I of solid benzene. The EoS has a validity range from 15 K up to the temperature and pressure of the solid II–solid I–liquid triple point, that is, 488.3 K and 1164.6 MPa. The EoS parameters have been regressed on literature data of molar volume, isothermal compressibility, thermal expansion, and isobaric and isochoric heat capacities. The average absolute deviation between the EoS and the primary data is 6.8% for isothermal compressibility, 5.5% for isobaric thermal expansion, 0.9% for molar volume, 2.7% for isobaric heat capacity, and 4.9% for isochoric heat capacity. The EoS maintains a physically correct behavior in the whole range of temperature and pressure of existence of phase I of solid benzene. The developed EoS for solid benzene has been coupled with the reference equation of state for the fluid phases developed by Thol , High Temp.-High Press 2012, 41, 81–97 for calculating the melting and sublimation curves. Predictions of sublimation pressures are in excellent agreement with the recommended values of Ružička , J. Chem. Thermodynamics 2014, 68, 40–47 and those of melting temperatures matches very well the values obtained from the auxiliary melting equation in the validity limits of the EoS of Thol , High Temp.-High Press 2012, 41, 81–97.