Excess functions and equations of state

Peneloux, André; Abdoul, Wahabou; Rauzy, Evelyne

doi:10.1016/0378-3812(89)80172-4

Cited by 91 publications

(46 citation statements)

References 27 publications

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“…To sum up, the PPR78 model may be seen as the coupling at constant packing fraction of the PR78 EoS and a Van Laar-type g E function. The used mixing rules which combine at constant packing fraction a cubic EoS and a g E model are based on the zeroth-order approximation of Guggenheim's quasi-reticular model 19 as initially proposed by Péneloux et al 20 The PPR78 approach is thus a so-called EoS/g E model. 21 The following equations are used:…”

Section: The Ppr78 Modelmentioning

confidence: 99%

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

2010

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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 g E 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 k ij of the widely used PR EoS. Our model is endowed of 15 groups and it is possible to predict the k ij for any mixture containing alkanes, aromatics, naphthenes, CO 2 , N 2 , H 2 S, 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. V V C 2010 American Institute of Chemical Engineers AIChE J, 56: [3225][3226][3227][3228][3229][3230][3231][3232][3233][3234][3235] 2010

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Section: The Ppr78 Modelmentioning

confidence: 99%

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

2010

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“…The attraction term a and the covolume b are expressed as usual, they include the critical parameters (T c and P c ) and the acentric factor of each constituent. To consider the entire mixture as a unique constituent obeying the same formalism (van der Waals, 1873), mixture rules are applied to determine the global parameters of the fluid (Péneloux et al, 1989, Abdoul, 1987:…”

Section: The Szewczyk and Béhar Model And Its Integration In Athos Somentioning

confidence: 99%

Characterisation of Asphaltenes and Modelling of Flocculation – State of the Art

Pina¹,

Mougin²,

Béhar³

2006

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Caractérisation des asphaltènes et modélisation de la floculation -État de l'Art -Ce travail présente un état de l'art concernant la floculation des asphaltènes avec deux grands items : la caractérisation des asphaltènes dans différents milieux et la modélisation de la floculation. Cette revue commence par une caractérisation des asphaltènes proprement dite puis des caractérisations de ces derniers dans des solvants synthétiques ou des bruts. Nous insistons sur les techniques de détermination de masses molaires et de diffraction. L'incidence d'un ajout de bon/mauvais solvant est également discutée. La seconde partie de cette revue concerne la modélisation de la floculation. Elle examine les différents modèles de la littérature avant de présenter celui de Szewczyk et Béhar (1999) et son intégration dans un simulateur de réservoir. Les modèles disponibles requièrent encore des données expérimentales délicates à acquérir et un effort de recherche doit être réalisé pour améliorer cet état de fait. Abstract -Characterisation of Asphaltenes and Modelling of Flocculation -State of the Art -This document describes a state of the art concerning the flocculation of asphaltenes with two major sections: characterisation of asphaltenes in various environments and modelling of flocculation. This review starts with the characterisation of asphaltenes as such, then their characterisation in synthetic solvents or crudes. Emphasis is placed on molar mass determination and diffraction techniques. The impact of adding a good/poor solvent is also discussed. The second part of this review is dedicated to modelling.We first examine the various models in the literature before describing the Szewczyk and Béhar (1999) model and its integration in a reservoir simulator. The models available still require experimental data which is difficult to collect and further research is needed to improve this situation.Petroleum Industry Applications of Thermodynamics Applications de la thermodynamique dans l'industrie pétrolière

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“…2) C HVOS = ±0.693 for SRK EoS (corresponding to v/b = 1). This type of assumption of constant u is similar to the model used by Rauzy and Peneloux [135] for pure components, and that by Peneloux et al [136] for mixtures, though not based on the Guggenheim lattice model, Orbey and Sandler pointed out. Orbey and Sandler [137] improved the LCVM model by removing its theoretical inconsistency regarding the reference pressure.…”

Section: Reviewmentioning

confidence: 86%

Prediction of Vapor-Liquid Equilibria Using Peng-Robinson and Soave-Redlich-Kwong Equations of State

Ghosh¹

1999

Chem. Eng. Technol.

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Knowledge of vapor-liquid equilibria is essential for chemical process design. Development of algebraically simple cubic equations of state, particularly Peng-Robinson and Soave-Redlich-Kwong equations of state has encouraged vapor-liquid equilibria calculation using the equation of state approach. To extend applicability to complex mixtures, several modifications to these equations of state were proposed. Also, many new mixing rules have been developed besides the already existing ones that incorporate excess free energy models. Some of these EoS/G E models are found to be applicable to complex systems in which the components can be highly polar, differ vastly in size or may be forming association. In spite of a large number of publications on this field, this subject is still open for further research. In this article, an overview on the work done using the most successful of the cubic equations of state, i.e., Peng-Robinson and Soave-Redlich-Kwong equations of state is presented. In the later part of this article, VLE predictions (using these two equations of state) of some interesting systems like water/hydrocarbon mixtures, polymer solutions, electrolyte solutions and refrigerant mixtures are discussed. The objective is to present the available information for ready reference that will prove to be useful from a designers point of view. It is seen from the existing literature that with a proper choice of equation of state and mixing rule based on the available knowledge on the properties of the system of interest, VLE of highly complex systems can be predicted with accuracy. Several comparative studies that are cited here (and discussed) will help the designer to pick-up the right combination for the system under investigation.

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Excess functions and equations of state

Cited by 91 publications

References 27 publications

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

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

Characterisation of Asphaltenes and Modelling of Flocculation – State of the Art

Prediction of Vapor-Liquid Equilibria Using Peng-Robinson and Soave-Redlich-Kwong Equations of State

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