Liquid Volumes from Generalized Cubic Equations of State: Take It with Care

Valderrama, José O.; Alfaro, Marco

doi:10.2516/ogst:2000039

Cited by 27 publications

(19 citation statements)

References 21 publications

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“…Over the years, numerous authors modified the VDW equation of state e.g., Redlich and Kwong [1949], Soave [1972], Peng and Robinson [1976], Patel and Teja [1982], or Schwartzentruber et al [1989]. Their relations, written as P = P(V, T ) are known as "cubic" equations of state, which are algebraically simple and relatively accurate [Wei, 1998;Valderrama and Alfaro, 2000]:…”

Section: Historical Evolution Of Empirical and Semi-empirical Equatiomentioning

confidence: 99%

Equations of State and Free‐Volume Content

Moulinié

Utracki

2010

Polymer Physics

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Section: Historical Evolution Of Empirical and Semi-empirical Equatiomentioning

confidence: 99%

Equations of State and Free‐Volume Content

Moulinié

Utracki

2010

Polymer Physics

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“…Currently used classical equations of state are insufficiently precise for the calculation of liquid saturation densities [7][8][9], and a volume correction is needed to obtain adequate results [10]. Another alternative is the use of specific coefficients for each fluid in a general cubic equation of state [11,12].…”

Section: Introductionmentioning

confidence: 98%

“…Well-known examples are the Soave-Redlich-Kwong [22] and the PengRobinson [23] EOSs. Valderrama and Alfaro [7] use some of these wellknown EOSs to obtain the liquid-phase volumes of several industrially important fluids, and analyze the accuracy of each of them. They give some recommendations about which equation should be used for a given situation [7,8].…”

Section: Introductionmentioning

confidence: 99%

Liquid Saturation Density from Simple Equations of State

Mulero

Cachadiña

2007

Int J Thermophys

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Several simple equations of state, requiring only two input properties, have been studied in order to determine the liquid saturation density of 144 fluids of different kinds. This study includes old and new simple modifications of the van der Waals equation of state, and the Carnahan-Starling-YelashKraska and Carnahan-Starling-Dieterici equations. The new simple modifications of the van der Waals equation give better overall results than some other more complex proposed equations, especially near the critical point. The recent equation proposed by Eslami including the boiling temperature and density as input parameters was also checked, and was found not to reproduce the critical point, but to give excellent results at intermediate or low temperatures. As a reference, the behavior of the well-known SoaveRedlich-Kwong and Peng-Robinson equations, and the more recent expression proposed by Mohsen-Nia et al. that requires three input parameters were also checked. The latter does not improve the accuracy of the PengRobinson equation, and very simple van-der-Waals type equations give better overall results.

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“…In general, liquid densities tend to be underestimated by the SRK and PR CEoS [26]. To improve the density predictions of dense fluid phases, volume translations can be used.…”

Section: Cubic Equations Of Statementioning

confidence: 99%

Comparative study of vapour-liquid equilibrium and density modelling of mixtures related to carbon capture and storage with the SRK, PR, PC-SAFT and SAFT-VR Mie equations of state for industrial uses

Pérez

Coquelet

Paricaud

et al. 2017

Fluid Phase Equilibria

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Carbon capture and storage (CCS) is nowadays considered as one of the most promising methods to counterbalance the CO 2 emissions from the combustion of fossil fuels, natural gas processing, cement manufacturing, etc. In dealing with the transport and the storage of CO 2 -rich streams, design of a safe and optimum process requires the knowledge of thermophysical properties (especially density) of CO 2 -rich mixtures. Consequently, the development of accurate thermodynamic models to evaluate these properties plays a key role in the context of CCS. This work is focused on comparing the capability of four Equations of State (EoSs) in modelling the Vapour-Liquid Equilibrium (VLE) and the density of binary mixtures of interest in the field of CCS. Two Cubic EoSs (CEoS), the original Soave-Redlich-Kwong (SRK) and Peng-Robinson (PR) EoSs, and two Statistical Associating Fluid Theory-based EoSs, namely the Perturbed Chain (PC-SAFT) EoS and the Variable Range SAFT-VR MieEoS have been considered. These EoSs were compared (with both zero and regressed binary interaction parameters) with respect to VLE and density data of 108 binary mixtures of five main gaseous components (CO 2 , CH 4 , C 2 H 6 , N 2 , and H 2 S). Concerning the cubic EoS, the Peneloux volume translation was used to better correlate densities. The comparison reveals that on average the most accurate VLE and density predictions are obtained with the SAFTbased EoSs, while similar results in VLE calculations are obtained with the four EoSs when regressed binary interaction parameters are used. The SAFT-VR Mie EoS is on average more accurate for the description of VLE and density data than the other studied models.

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Liquid Volumes from Generalized Cubic Equations of State: Take It with Care

Abstract: Oil & Gas Science and Technology -Rev. IFP, Vol. 55 (2000), No. 5

Cited by 27 publications

References 21 publications

Equations of State and Free‐Volume Content

Equations of State and Free‐Volume Content

Liquid Saturation Density from Simple Equations of State

Comparative study of vapour-liquid equilibrium and density modelling of mixtures related to carbon capture and storage with the SRK, PR, PC-SAFT and SAFT-VR Mie equations of state for industrial uses

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