2012•Tsinghua Science & TechnologyOpen access

Phase equilibrium calculation of mixtures: Use of the SAFT-BACK equation of state for binary systems under elevated pressure

Zhiyu Zhang, Zhongqiao Hu, Jichu Yang, Yigui Li

Abstract

The statistical associating fluid theory (SAFT) Boublik Alder Chen Kreglewshi(BACK) equation of state is employed to correlate vapor liquid equilibria of 16 binary mixtures composed of supercritical fluids with other fluids at elevated pressures. The van der Waals mixing rules are used and the binary parameters are adjusted to experimental data. The SAFT BACK equation of state provides a better correlation of vapor liquid equilibrium than the original BACK equation. Consequently, the binary parameters computed from the data sets can be used to accurately predict the saturated densities of the vapor and liquid phases. 

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Available abstract

Key concepts: Equation of state, Thermodynamics, Binary number, Supercritical fluid, Vapor–liquid equilibrium, van der Waals force, Vapor pressure, Phase equilibrium