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A New Four-Parameter Cubic Equation of State for Predicting Fluids Phase Behavior.pdf (632.91 kB)

A New Four-Parameter Cubic Equation of State for Predicting Fluid Phase Behavior

preprint
submitted on 01.06.2019, 07:45 and posted on 03.06.2019, 16:00 by zhiren he

A new four-parameter cubic equation of state (EoS) is generated by incorporating the critical compressibility factor (Zc) apart from the critical pressure (Pc) and temperature (Tc). One free parameter in the denominator of the attractive term and two parameters in the alpha function are adjusted using the experimental data of saturated liquid density, vapor pressure, and isobaric liquid heat capacity of 48 components including hydrocarbons and non-hydrocarbons. Applying this equation of state, saturated liquid density, saturated vapor density, and vapor pressure of pure components are accurately reproduced compared with experimental values. Furthermore, the predicted properties including derivatives of alpha function, such as enthalpy of vaporization, entropy of vaporization and isobaric heat capacity of liquid, also have decent accuracy. The global average absolute relative deviation (AAD) of saturated liquid density, saturated vapor density, saturated vapor pressure, enthalpy of vaporization, entropy of vaporization, and isobaric heat capacity of liquid in a wide reduced temperature (Tr) range of subcritical region reproduced by this work are 4.33%, 4.18%, 3.19%, 2.26%, 2.27%, and 5.82%, respectively. Substantial improvement has been achieved for the isobaric liquid heat capacity calculation.

History

Email Address of Submitting Author

hehzr@163.com

Institution

China University of Petroleum (Beijing), Beijing

Country

China

ORCID For Submitting Author

0000-0002-7851-7195

Declaration of Conflict of Interest

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

Version Notes

This is the final version of the paper

Exports