Lozano-Martín, Daniel, Susial, Rodrigo, Hernández, Pedro, Fernández-Vicente, Teresa E., Martín, M. Carmen and Segovia, José J. (2021) Speed of sound and phase equilibria for (CO2 + C3H8) mixtures. Journal of Chemical Thermodynamics, 158 . Art.Nr. 106464. DOI 10.1016/j.jct.2021.106464.

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Abstract

Highlights

• Carbon dioxide + propane mixtures are studied through accurate measurements of speeds of sound and phase equilibria.

• Heat capacities and virial coefficients are obtained from speeds of sound.

• Retrograde condensation zone is found for the (0.60 CO2 + 0.40 C3H8) mixture.

• Results are compared with reference equations of state such as GERG-2008 and AGA8-DC92.

This work presents phase envelope and speed of sound data for the (0.60 CO2 + 0.40 C3H8) and (0.80 CO2 + 0.20 C3H8) binary mixtures. Phase equilibria was measured using a cylindrical resonator working in the microwave band whereas an acoustic resonator was used for speed of sound measurements. The experimental results were compared with GERG-2008 equation of state, obtaining average absolute deviations by 0.24% in pressure for phase equilibria data and 0.025% for speed of sound data. Speed of sound values were used to derive perfect-gas heat capacities, acoustic virial coefficients, and second density virial coefficients. In addition, AGA8-DC92 equation of state performance was checked for the results derived from speeds of sound.

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