Phase behavior of multicomponent alkane mixtures and evaluation of predictive capacity for the PR and RKPR EoS's

TASSIN, N.G.; MASCIETTI, V.; CISMONDI, MARTÍN

FLUID PHASE EQUILIBRIA

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2018 vol. 480 p. 53 - 65

0378-3812

TheRKPR EoS was developed in the past decade as a three-parameter model, with theintention to overcome some of the limitations of classic two-parameter cubicequations of state. More recently, parameter correlations were presented foralkanes and their mixtures, showing excellent capacity to predict the fluidphase behavior of binary mixtures up to the more asymmetric combinations and inwide ranges of temperature and pressure.Inthis work, different types of phase equilibrium data for multicomponentmixtures are considered, in order to see whether the good performancepreviously demonstrated for binary systems is also transferable tomulticomponent mixtures like the ones typically encountered in synthetic fluidsdesigned in the lab as model reservoir fluids.Inthe case of ternary systems with good availability of constant temperature andpressure data sets, the type and behavior of these Gibbs triangle diagrams areanalyzed with reference to the general or global behavior of the system, basedon pure compound saturation and binary critical lines, something we had notfound in the literature preceding this work.Theresults and comparisons presented in this article allow concluding thatRKPR2015 can be a useful tool with very good predictive capacity to describethe fluid phase equilibria of hydrocarbon mixtures. Advantages over thePeng-Robinson equation appear more clearly for the more asymmetric fluids,including synthetic gas condensates.