Abstract
Mixture phase equilibrium and thermodynamic properties have a significant role in industry. Numerical analysis of flash calculation generates an appropriate solution for the problem. In this research, a comparison of Soave Redlich Kwong (SRK) and Peng-Robinson (PR) equations of state predicting the thermodynamic properties of a mixture of hydrocarbon and related compounds in a critical region at phase equilibrium is performed. By applying mathematical modeling of both equations of states, the behavior of binary gases mixtures is monitored. The numerical analysis of isothermal flash calculations is applied to study the pressure behavior with volume and mole fraction. The approach used in this research shows considerable convergence with experimental results available in the literature.
Highlights
Thermodynamic properties play a vital role in chemical engineering applications for chemical process design and simulations [1]
Numerical analysis approach is applied for both Soave Redlich Kwong (SRK) and PR equation of states (EOS) on four sets of binary mixtures: hydrogen/propane, methane/n-butane, carbon dioxide/propane and methane/ndecane with a tolerance level of 10-7
The phase behavior shows no difference between SRK and PR EOS model results with experimental data [27] but in the liquid phase, the phase behavior results of SRK model show less deviation compared to the results of PR model
Summary
Thermodynamic properties play a vital role in chemical engineering applications for chemical process design and simulations [1]. The SRK and PR EOSs are mostly used in chemical industries for the prediction of vapor-liquid equilibrium and thermodynamic properties for both polar and nonpolar compounds containing mixtures [10, 11]. The PR EOS prediction of saturated liquid density, constant critical compressibility factor and vaporliquid equilibrium for hydrogen and nitrogen is more precise compared to SRK [12,13,14,15]. In PR and SRK calculation the critical compressibility factor and the Pitzer acentric factor is kept constant for all mixture compounds [6, 19,20,21,22] This acentric factor is involved in the estimation of the mean field parameter and the effective volume for both SRK and PR EOSs. the relationship of an acentric factor with the mean field parameter and the effective volume is different for both equations [23].
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