High pressure phase behavior modeling of asymmetric Alkane + Alkane binary systems with the RKPR EOS

CISMONDI DUARTE, M.; GALDO, M.V.; GOMEZ, M.J.; TASSIN, N.G.; YANES, M.

FLUID PHASE EQUILIBRIA

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2013 vol. 362 p. 125 - 135

0378-3812

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