Volumetric properties of supercritical carbon dioxide from volume-translated and modified Peng-Robinson equations of state

Hekayati, Javad; Roosta, Aliakbar; Javanmardi, Jafar

doi:10.1007/s11814-016-0176-5

Cited by 18 publications

(2 citation statements)

References 109 publications

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“…The vapor pressure is calculated by imposing the fundamental criteria of vapor–liquid phase equilibrium of a pure substance at the temperature of interest, which in terms of fugacity coefficient has the form:

φ^{L} ((),, T, P^{sat .}) = φ^{V} ((),, T, P^{sat .})

where the superscripts L and V stand for liquid and vapor phases, respectively. The functional form of the PR EOS itself, as well as the working equations for calculation of the fugacity coefficients, are available elsewhere 64,65 and hence are not reproduced here for brevity. Also, considering that most industrial processes operate at pressures above 0.1 bar and also the fact that cubic EOSs are generally not accurate at lower values, in calculating P sat.…”

Section: Methodsmentioning

confidence: 99%

Estimation of the critical properties of compounds using volume‐based thermodynamics

Hekayati

Raeissi

2020

AIChE Journal

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The importance, yet scarcity of the critical constants of thermally unstable fluids warrants the development of reliable methods for the estimation of these essential thermodynamic properties. A thorough investigation undertaken in this study on 1,589 compounds belonging to 83 chemical classes, indicated that the ratio of critical temperature to critical pressure Tc Pc of both low and high molecular weight compounds could be well expressed in terms of their volumetric properties. In addition, two new methodologies are presented for estimating V c , as well as an indirect approach for prediction of T c from surface tension data, altogether allowing the calculation of Z c. Moreover, comparative studies are made with five group contribution methods. It is also demonstrated that by employing the Peng-Robinson EOS, and without prior knowledge of the critical properties, it is possible to calculate various thermophysical properties including P sat. , T b , ρ sat: liq: , ΔH vap. , C p , and even the T c and P c themselves.

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φ^{L} ((),, T, P^{sat .}) = φ^{V} ((),, T, P^{sat .})

Section: Methodsmentioning

confidence: 99%

Estimation of the critical properties of compounds using volume‐based thermodynamics

Hekayati

Raeissi

2020

AIChE Journal

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“…We calculate the density of gases as a function of depth with the van der Waals (4) and Peng-Robinson (7) EoSs, whilst the bulk modulus is computed with equations ( 14) and (15).…”

Section: Seismic Properties Of Gas Bearing Rocksmentioning

confidence: 99%

Acoustics for seismic monitoring H2 storage in saline aquifers. A comparative study with the CO2 and CH4 cases.

Gei,

Carcione,

Picotti

2024

Preprint

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We model the acoustics of rocks partially saturated with hydrogen. We compare the acoustic properties of H2 (hydrogen), CO2 (carbon dioxide) and CH4 (methane) and those of rocks saturated with these gases and brine. The gas properties are obtained from the Peng-Robinson equation of state, and we consider the pressure-temperature conditions based on a linear basin modeling with a constant geothermal gradient. The bulk and shear moduli of the dry rock are obtained with the Krief model, while the Athy equation is used to calculate the porosity as a function of depth. Mesoscopic attenuation and velocity dispersion due to fluid effects is quantified using the Johnson model. The viscoelastic Cole-Cole model is used to describe the velocities and attenuation predicted by the Johnson model when synthetic seismograms with an equivalent viscoelastic rheology are to be calculated. In this case, the P-wave velocity as a function of gas saturation is obtained with the Gassmann equation and an effective fluid modulus based on the Brie equation.

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A Model Approach to Comparing and Selecting the Optimal Equations of State

Petrik

2019

Springer Proceedings in Earth and Environmental Sciences

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Volumetric properties of supercritical carbon dioxide from volume-translated and modified Peng-Robinson equations of state

Cited by 18 publications

References 109 publications

Estimation of the critical properties of compounds using volume‐based thermodynamics

Estimation of the critical properties of compounds using volume‐based thermodynamics

Acoustics for seismic monitoring H2 storage in saline aquifers. A comparative study with the CO2 and CH4 cases.

A Model Approach to Comparing and Selecting the Optimal Equations of State

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