PρT measurements and derived properties of liquid 1,2-alkanediols

The densities of compressed liquid 1,2-alkanediols (C2, C3 and C4) were measured with a vibration tube densimeter over the temperature range from 278.15 K to 358.15 K and pressures up to 60 MPa, with an uncertainty of ±0.0012 g·cm−3. Densities were correlated with pressure and temperature by the TRIDEN 10-parameter equation. Values of the isothermal compressibility, isobaric thermal expansivity and internal pressure were calculated from the experimental results. Reported data are compared with predictions obtained using the PC-SAFT equation of state. The influence of the carbon-chain lengths over the obtained thermophysical properties was studied.

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► The PρT behaviour of 1,2-alkanediols is studied.
► Vibrating tube densimeter was used up to 60 MPa and 358.15 K.
► TRIDEN 10-parameters equation was used to fit experimental data.
► Properties were analyzed as a function of pressure, temperature and chain length.
► PC-SAFT molecular-based equation of state was used for modelling purposes.