Phasety

Córdoba, Argentina
Córdoba, Argentina
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Cismondi Duarte M.,Phasety | Cismondi Duarte M.,National University of Cordoba | Cruz Doblas J.,Phasety | Gomez M.J.,Phasety | Montoya G.F.,Phasety
Fluid Phase Equilibria | Year: 2015

After showing in a previous publication a clear superiority to the classic Peng-Robinson EoS for the description of high pressure phase behavior in the more asymmetric alkane-alkane binary mixtures, in this work the RKPR EoS is turned into a predictive model by developing correlations of interaction parameters for all possible pairs or normal alkanes, associated also to a new parameterization of pure compounds. The proposed correlations are based on van der Waals quadratic mixing rules. Repulsive interaction lij parameters are implemented in all cases, while attractive kij interactions were necessary only for the methane-series and the more asymmetric systems of propane, in particular with carbon numbers higher than 24. The analysis of the results, in comparison to an important diversity of data available for several dozens of systems, demonstrates a very good predictive power for the new correlations, which could be useful in modeling the phase behavior of different hydrocarbon fluids. © 2015 Elsevier B.V.


Cismondi Duarte M.,National University of Cordoba | Galdo M.V.,Phasety | Gomez M.J.,Phasety | Tassin N.G.,Phasety | Yanes M.,Phasety
Fluid Phase Equilibria | Year: 2014

Very asymmetric hydrocarbon mixtures present an interesting academic challenge for their modeling. In addition, they are becoming more important technologically, since the world oil reserves are becoming heavier in average. The RKPR EOS was developed in recent years in order to consider asymmetric systems and allow for a good representation of densities for different types of compounds while maintaining the relative simplicity of cubic equations of state. In this work the RKPR EOS is applied for the first time for the correlation of phase behavior in the series of binary systems methane. +. n-alkane and ethane. +. n-alkane. In addition to the use of attractive and repulsive interaction parameters with quadratic mixing rules, the role of the extra degree of freedom that the RKPR model offers for setting the pure compound parameters was also examined. A new table of RKPR pure compound parameters was defined for n-alkanes. A comparative study was made with the Peng-Robinson EOS, based on following the same optimization procedure for interaction parameters. © 2013 Elsevier B.V.

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