Thermodynamic consistency test of high pressure gas–liquid equilibrium data including both phases

Valderrama, José O.; Faúndez, Claudio A.

doi:10.1016/j.tca.2009.11.006

Cited by 45 publications

(100 citation statements)

References 17 publications

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“…The experimental data at 1500 and 2000 kPa for ethanol/water have been verified following the procedure and by using the thermodynamic relationships suggested in the bibliography. 25,26 As the authors explained in previous papers, the consistency method proposed by the authors can be considered as a modeling procedure 25 because, to check the experimental data consistency, a thermodynamic model that can accurately fit the experimental data must be used. 25,60 Generally, the methods to check the thermodynamic consistency are based on the Gibbs−Duhem equation, which can be applied for both the phases of the homogeneous mixture 27,61 in terms of residual molar properties.…”

Section: Vapor Pressuresmentioning

confidence: 99%

High-Pressure Phase Equilibria in an Ethanol/Water Binary System: Experimental Data and Modeling

et al. 2021

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Experimental data of vapor−liquid equilibria (VLE) are reported for the binary systems: ethanol (1) + water (2) at 100, 1500, and 2000 kPa. The data were verified for thermodynamic consistency by using different low-and high-pressure tests. The following minimum azeotropes were found for the binary systems: x 1,az = y 1,az = 0.899 and T = 351.39 K at 100 kPa, x 1,az = y 1,az = 0.857 and T = 440.70 K at 1500 kPa, and x 1,az = y 1,az = 0.850 and T = 453.83 K at 2000 kPa. The quality of the azeotropic data obtained was established by considering the trend of the bibliographic azeotropic data. The phase behavior was modeled using the Peng−Robinson equation of state (EOS) with several mixing rules and the perturbed-chain statistical associating fluid theory. The experimental data were satisfactorily correlated and a qualitative agreement with these predictive models was observed. ■ RESEARCH HIGHLIGHTS• VLE of water with ethanol was determined at 100, 1500, and 2000 kPa. • Data were verified with the area test, Van Ness direct test, and point-to-point test. • Data at high pressure were verified by using the Gibbs− Duhem equation. • Azeotropic data of water/ethanol were correlated.• VLE data of water + ethanol mixtures are well modeled by using different EOSs.

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Section: Vapor Pressuresmentioning

confidence: 99%

High-Pressure Phase Equilibria in an Ethanol/Water Binary System: Experimental Data and Modeling

et al. 2021

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“…Thermodynamic consistency of the experimental data has been tentatively tested by means of the method proposed by Valderrama and Faúndez [34] for high pressure gas-liquid equilibrium data including both phases, which has been adapted to ternary mixtures at isobaric conditions. This method can be considered as a modeling procedure since a thermodynamic model that can accurately fit the experimental data must be first used to apply the consistency test [34].…”

Section: Thermodynamic Consistencymentioning

confidence: 99%

“…The expression of the Gibbs-Duhem equation given in [34] at isothermal, isobaric conditions can be reduced to:…”

Section: Thermodynamic Consistencymentioning

confidence: 99%

Phase behaviour of the pseudo-ternary system carbon dioxide + ethanol + fish oil at high pressures

Melgosa

Sanz

Solaesa

et al. 2017

The Journal of Chemical Thermodynamics

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This work provides experimental fluid phase equilibrium data of the pseudo-ternary mixture CO 2 + ethanol + fish oil, a system of interest in pharmaceutical and food-industry applications such as the production of omega-3-enriched lipid derivatives at mild, non-oxidative conditions. Experimental tie-lines were obtained by means of an analytical isothermal method with recirculation of the vapour phase. Measurements were carried out in the temperature range 323.15 K-343.15 K and at pressures from 10 MPa to 30 MPa. The Peng-Robinson equation of state coupled with the conventional van der Waals mixing rules with two adjustable parameters was used for experimental data correlation.

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“…[19][20][21][22][23][24] Good reviews of these methods are given elsewhere. 22,23 In recent years, Valderrama and coworkers [24][25][26][27][28] have investigated the applications of numerical thermodynamic consistency methods to various systems including incomplete phase equilibrium data of high-pressure gas-liquid mixtures, 24 high pressure ternary mixtures of compressed gas and solid solutes, 25 high pressure gas-solid solubility data of binary mixtures, 26 vapor-liquid equilibrium data for mixtures containing ionic liquids, 27 and high pressure gas-liquid equilibrium data including both liquid and gas phases. 28 A method especially employed for determining thermodynamic consistency of high pressure gas-solid data by Valderrama and Alvarez, 24 which is based on rewriting the ''Gibbs-Duhem equation'' [19][20][21] in terms of fugacity coefficients 29 has been used in our work.…”

Section: Thermodynamic Consistency Testmentioning

confidence: 99%

“…Regarding these facts, the thermodynamic consistency test criteria are applied through the following instructions: [24][25][26][27][28] 1. Check the percentage Dy 2 not to be outside of the margins of errors [0,20]%.…”

Section: Consistency Criteriamentioning

confidence: 99%

Thermodynamic consistency test for experimental data of water content of methane

Eslamimanesh¹,

Mohammadi²,

Richon³

2010

AIChE Journal

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Accurate knowledge of the water content of natural gases is an important factor to estimate the gas hydrate, ice, and condensed water formation conditions. However, the experimental data regarding the water content of gases in equilibrium with the gas hydrate, ice, or liquid water (near gas hydrate or ice formation region) are limited. This is partly because of the fact that concentration of water in the gaseous phase in equilibrium with gas hydrate, ice or liquid water (near gas hydrate or ice formation region) is very low considering that reaching the equilibrium conditions near and inside gas hydrate or ice formation region is time consuming process. The measurement difficulties may consequently result in generating unreliable experimental data. This work aims at performing a thermodynamic consistency test based on area approach to study the reliability of some experimental data reported in the literature on the water content of methane (the main component of natural gases) in equilibrium with the gas hydrate, ice, or liquid water (near gas hydrate or ice formation region). A discussion is made on the studied experimental data according to the performed consistency test.

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Thermodynamic consistency test of high pressure gas–liquid equilibrium data including both phases

Cited by 45 publications

References 17 publications

High-Pressure Phase Equilibria in an Ethanol/Water Binary System: Experimental Data and Modeling

High-Pressure Phase Equilibria in an Ethanol/Water Binary System: Experimental Data and Modeling

Phase behaviour of the pseudo-ternary system carbon dioxide + ethanol + fish oil at high pressures

Thermodynamic consistency test for experimental data of water content of methane

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