A Method To Determine Virial Coefficients from Experimental (<i>p</i>,ρ,<i>T</i>) Measurements

Cristancho, Diego E.; Acosta-Perez, Pedro L.; Mantilla, I.; Holste, James C.; Hall, Kenneth R.; Iglesias‐Silva, Gustavo A.

doi:10.1021/acs.jced.5b00629

Cited by 7 publications

(4 citation statements)

References 9 publications

(38 reference statements)

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“…N is the number of terms of the equation. The method proposed by Cristancho et al 28 was used to determine the number of terms at which the VEoS must be truncated for processing the virial coefficients for the three (CH 4 + H 2 ) binary mixtures. A characteristic of this method is that the number of terms to be fitted depends on the maximum experimental pressure, p max , of the experimental data set used for the adjustment.…”

Section: ■ Discussion Of the Resultsmentioning

confidence: 99%

Accurate Experimental (p, ρ, and T) Data for the Introduction of Hydrogen into the Natural Gas Grid (II): Thermodynamic Characterization of the Methane–Hydrogen Binary System from 240 to 350 K and Pressures up to 20 MPa

et al. 2018

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Most of the experimental density data of the methane− hydrogen binary system available at the time of the development of the equation of state for natural gases and related mixtures, GERG-2008, at temperatures above 270 K were limited to hydrogen contents higher than 0.20 (amount-of-substance fraction). On the contrary, for mixtures with hydrogen contents lower than 0.20, experimental data were limited to temperatures below 270 K. This work intends to close the gap and provides accurate experimental (p, ρ, and T) data for three binary mixtures of methane and hydrogen, (0.95 CH 4 + 0.05 H 2 ), (0.90 CH 4 + 0.10 H 2 ), and (0.50 CH 4 + 0.50 H 2 ), at temperatures of 240, 250, 260, 275, 300, 325, and 350 K, thus extending the range of available experimental data to higher temperatures for mixtures with hydrogen contents lower than 0.20 and, accordingly, to lower temperatures for mixtures with hydrogen contents higher than 0.20. The density measurements were performed by using a single-sinker densimeter with magnetic suspension coupling at pressures up to 20 MPa. Experimental data were compared to the corresponding densities calculated from the GERG-2008 and the AGA8-DC92 equations of state, respectively. The experimental data are within the uncertainty of both equations of state, except at the lower temperatures of 240 and 250 K and pressures over 14 MPa for the mixtures with a hydrogen content of 0.05 and 0.10, respectively. The virial coefficients B(T, x) and C(T, x), as well as the second interaction virial coefficient B 12 (T) for the methane−hydrogen binary system, were also calculated from the experimental data set at temperatures from 240 to 350 K using the virial equation of state.

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Section: ■ Discussion Of the Resultsmentioning

confidence: 99%

Accurate Experimental (p, ρ, and T) Data for the Introduction of Hydrogen into the Natural Gas Grid (II): Thermodynamic Characterization of the Methane–Hydrogen Binary System from 240 to 350 K and Pressures up to 20 MPa

et al. 2018

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“…The first one ( B 1 ) is by fitting the P ρ T data with the “classical” virial equation truncated in the third term. , In this method we used the data from Bich et al …”

Section: Properties Evaluatedmentioning

confidence: 99%

Extensive Study of the Capabilities and Limitations of the CPA and sPC-SAFT Equations of State in Modeling a Wide Range of Acetic Acid Properties

Ribeiro

Alberton

Paredes

et al. 2018

Ind. Eng. Chem. Res.

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The accurate description of many thermodynamic properties of acetic acid and its mixtures can be a challenge to model with standard thermodynamic models like local-composition activity coefficient models and cubic equations of state. A possible solution is offered by association equations of state, e.g. those belonging to the Statistical Associating Fluid Theory (SAFT) family. While several researchers have studied the use of SAFT variants to model acetic acid properties (pure compound and mixtures), with few exceptions, those studies focused exclusively on phase equilibria including vapor pressure and density. Other important properties, such as the speed of sound, second virial coefficient, compressibility factor, enthalpy of vaporization, and the isobaric heat capacity have not been considered yet. Few studies investigate which is the appropriate association scheme to be used for acetic acid. In this work, we compare the capability of two association models, Cubic Plus Association (CPA) and simplified Perturbed-Chain SAFT (sPC-SAFT), to predict a wide range of properties of acetic acid (mixtures) including derivative properties. We evaluate the influence of including one or more of those properties in the parameter estimation procedure for sPC-SAFT, we compare the results obtained with various choices of the association schemes (one or two sites) and finally we evaluate the efficiency of CPA and sPC-SAFT in correlating the phase equilibria of the binary mixtures of acetic acid with water, hexane or ethanol. It is concluded that both equations of state perform overall similarly, with the one-site scheme performing better overall, especially for some properties. The results of the evaluation also show that some properties are inter-correlated in the parameter estimation process making it essentially impossible to obtain sets that can accurately describe all the properties of acetic acid.

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“…The method proposed by Cristancho et al [31] was used to determine the number of terms at which the virial EoS must be truncated and the maximum density ρ max of the experimental points used to fit this equation. The procedure, described in detail in a previous work [23], consists of two consecutive fits.…”

Section: Virial Coefficientsmentioning

confidence: 99%

Thermodynamic characterization of the (CO2 + O2) binary system for the development of models for CCS processes: Accurate experimental (p, ρ, T) data and virial coefficients

Lozano-Martín

Vega‐Maza

Martín

et al. 2021

The Journal of Supercritical Fluids

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A Method To Determine Virial Coefficients from Experimental (p,ρ,T) Measurements

Cited by 7 publications

References 9 publications

Accurate Experimental (p, ρ, and T) Data for the Introduction of Hydrogen into the Natural Gas Grid (II): Thermodynamic Characterization of the Methane–Hydrogen Binary System from 240 to 350 K and Pressures up to 20 MPa

Accurate Experimental (p, ρ, and T) Data for the Introduction of Hydrogen into the Natural Gas Grid (II): Thermodynamic Characterization of the Methane–Hydrogen Binary System from 240 to 350 K and Pressures up to 20 MPa

Extensive Study of the Capabilities and Limitations of the CPA and sPC-SAFT Equations of State in Modeling a Wide Range of Acetic Acid Properties

Thermodynamic characterization of the (CO2 + O2) binary system for the development of models for CCS processes: Accurate experimental (p, ρ, T) data and virial coefficients

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