Abstract
Alkane mixtures are important chemicals used in different fields. The pρTx data of the mixtures are essential for the establishment of the equation of state. In this work, the liquid densities of cyclopentane/n-octane mixtures at temperatures from 293.15 K to 363.15 K and at pressures up to 70 MPa were reported for the first time. The measurements were carried out using the experimental system based on the vibrating tube method. The combined expanded uncertainty for the present density measurement was evaluated to be less than 0.8 kg·m−3. Experimental density data of the cyclopentane/n-octane mixtures were fitted as the modified Tammann–Tait equation. The derived thermodynamic properties including isothermal compressibility (kT) and thermal expansivity (αp) were determined from the modified Tammann–Tait equation, and the results were analyzed. In addition, the PC-SAFT equation combined with Berthelot–Lorentz mixing rule was used to predict the densities of the mixtures, and the results show that the PC-SAFT equation can give good results for cyclopentane/n-octane mixtures when the binary interaction coefficient set to zero.
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This work was supported by the National Natural Science Foundation of China (Grant No. 52276165).
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YM contributed to measuring the densities, writing draft version. YJ contributed to the correlation of the Tait equation and analysis. XW contributed to reviewing and editing the whole manuscript.
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Ma, Y., Yu, J. & Wang, X. High-Pressure Densities and Derived Thermodynamic Properties of Cyclopentane/n-Octane Mixtures from 293.15 K to 363.15 K. Int J Thermophys 44, 37 (2023). https://doi.org/10.1007/s10765-022-03153-3
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DOI: https://doi.org/10.1007/s10765-022-03153-3