Predicting the phase equilibria of synthetic petroleum fluids with the PPR78 approach

The PPR78 approach is a group contribution‐based thermodynamic model which combines at constant packing fraction the Peng–Robinson equation of state and a Van Laar‐type gE model. This article demonstrates that, using classical mixing rules (linear on b and quadratic on a), the PPR78 model may also b...

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Bibliographic Details
Published in:AIChE journal 2010-12, Vol.56 (12), p.3225-3235
Main Authors: Jaubert, Jean-Noël, Privat, Romain, Mutelet, Fabrice
Format: Article
Language:English
Subjects:
Applied sciences
binary interaction parameters
Chemical and Process Engineering
Chemical engineering
Chemical thermodynamics
Chemistry
Computational fluid dynamics
Crude oil
Engineering Sciences
equation of state
Exact sciences and technology
Fluid flow
Fluids
Gases
General and physical chemistry
General. Theory
Mathematical models
Mercaptans
Mixing rules
Natural gas
Petroleum
petroleum fluids
Phase equilibria
predictive model
Studies
Thermodynamics
vapor-liquid equilibrium
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Summary:The PPR78 approach is a group contribution‐based thermodynamic model which combines at constant packing fraction the Peng–Robinson equation of state and a Van Laar‐type gE model. This article demonstrates that, using classical mixing rules (linear on b and quadratic on a), the PPR78 model may also be seen as a group contribution method for the estimation of the temperature‐dependent kij of the widely used PR EoS. Our model is endowed of 15 groups and it is possible to predict the kij for any mixture containing alkanes, aromatics, naphthenes, CO2, N2, H2S, and mercaptans. This study exhibits the capability of this approach to predict the phase behavior of synthetic petroleum fluids containing components of different volatilities. The many comparisons between calculated and experimental data on natural gases, crude oils, and gas condensates allow concluding that the PPR78 approach is a successful model for phase equilibria calculations of this kind of mixtures. © 2010 American Institute of Chemical Engineers AIChE J, 2010
ISSN:0001-1541
1547-5905
DOI:10.1002/aic.12232