Journal ArticleDOI
Predicting the Phase Equilibria of Synthetic Petroleum Fluids with the PPR78 Approach
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TLDR
The PPR78 approach as mentioned in this paper 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.Abstract:
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, 2010read more
Citations
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Peng-Robinson equation of state: 40 years through cubics
TL;DR: The Peng and Robinson equation of state (PR EoS) has become one of the most useful and successfully applied models for thermodynamic and volumetric calculations in both industrial and academic fields as mentioned in this paper.
Journal ArticleDOI
High carbon dioxide solubilities in imidazolium-based ionic liquids and in poly(ethylene glycol) dimethyl ether.
TL;DR: Experimental data indicate that 67 to 123 g of CO(2) can be absorbed perkg of ionic liquid and 198 g per kg of poly(ethylene glycol) dimethyl ether, component of selexol.
Journal ArticleDOI
A consistency test for α-functions of cubic equations of state
TL;DR: In this article, a consistency test for α-functions is proposed to verify the existence of continuous, positive (α > 0), monotonically decreasing (d α / d T 0 ), convex (d 2 α/d T 2 > 0 ) derivatives of cubic equations of state.
Journal ArticleDOI
Development of the translated-consistent tc-PR and tc-RK cubic equations of state for a safe and accurate prediction of volumetric, energetic and saturation properties of pure compounds in the sub- and super-critical domains
TL;DR: In this paper, translated and consistent versions of the Peng-Robinson (tc-PR) and Redlich-Kwong cubic equations of state (CEoS) are developed.
Journal ArticleDOI
Note on the properties altered by application of a Péneloux–type volume translation to an equation of state
TL;DR: In this article, a volume translation is applied to cubic equations of state with the aim of improving the description of volumetric properties such as enthalpy, entropy, internal energy, heat capacities, speed of sound, property changes on vaporization and many others.
References
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Journal ArticleDOI
A New Two-Constant Equation of State
Ding-Yu Peng,Donald B. Robinson +1 more
TL;DR: In this paper, the attractive pressure term of the semi-empirical van der Waals equation has been modified for predicting the vapor pressure and volumetric behavior of singie-component systems.
Journal ArticleDOI
New group contribution method for estimating properties of pure compounds
TL;DR: In this paper, a new group contribution method for the estimation of properties of pure organic compounds is presented, which is performed at two levels: the basic level uses contributions from first-order groups, while the next higher level uses a small set of second order groups having the first order groups as building blocks.
Journal ArticleDOI
A theoretically correct mixing rule for cubic equations of state
TL;DR: In this article, a mixing rule for cubic equations of state is proposed, which equates the excess Helmholtz free energy at infinite pressure from an equation of state to that from an activity coefficient model.
Journal ArticleDOI
New mixing rules in simple equations of state for representing vapour-liquid equilibria of strongly non-ideal mixtures☆
Marie-Jose Huron,J. Vidal +1 more
TL;DR: Huron and Vidal as mentioned in this paper proposed a new mixing rule in simple equations of state for representing vapour-liquid equilibria of strongly non-ideal mixtures, which can be reduced to the classical quadratic rule for some easily predicted values of the interaction energies.
Journal ArticleDOI
PSRK: A Group Contribution Equation of State Based on UNIFAC
T. Holderbaum,Jürgen Gmehling +1 more
TL;DR: A group contribution equation of state called PSRK (Predictive Soave-Redlich-Kwong) is proposed in this article to predict vapor-uquid-equilibria (VLB) for a large number of systems without introducing new model parameters.