Vapor - liquid equilibrium of the carbon dioxide/methane mixture at three isotherms

Petropoulou, Eirini; Voutsas, Epaminondas; Westman, Snorre Foss; Austegard, Anders; Stang, H.G. Jacob; Løvseth, Sigurd Weidemann

doi:10.1016/j.fluid.2018.01.011

Cited by 16 publications

(14 citation statements)

References 34 publications

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“…These correlations provides an excellent fit to the selected data (i.e. our results and those of Petropoulou et al [24]) and the critical composition locus is also quite similar to that obtained from the GERG-2008 mixture model [29] as implemented in the REFPROP software package [30]. It should be noted that REFPROP implements more accurate purefluid equations of state than are specified in GERG-2008 but it has the same mixing terms.…”

Section: The Critical Line Of the (Co 2 + Ch 4 ) Systemsupporting

confidence: 85%

“…(3) with the best fit parameters, which are given in Table 6. To establish correlations for the critical locus along its entire length, we consider the new results together with the recent high-precision measurements of Petropoulou et al [24] and the well-known critical points of the pure components [25,26]. We propose correlations for the critical pressure and mole fraction of CH 4 as functions of the dimensionless temperature…”

Section: The Critical Line Of the (Co 2 + Ch 4 ) Systemmentioning

confidence: 97%

“…T [24] Many of the gas processing scenarios mentioned above involve multi-component mixture of CH 4 , CO 2 and other substances. Thermodynamic models, optimized against experimental data for binary sub-systems, are typically used to compute VLE and other properties of such systems.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Vapor-liquid equilibria, solid-vapor-liquid equilibria and H2S partition coefficient in (CO2 + CH4) at temperatures between (203.96 and 303.15) K at pressures up to 9 MPa

Souza

Ghafri

Fandiño

et al. 2020

Fluid Phase Equilibria

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Vapor-liquid equilibrium (VLE) measurements of the (CO2 + CH4) system are reported along seven isotherms at temperatures varying from just above the triple point to just below the critical point of CO2 at pressures from the vapor pressure of pure CO2 to approximately 9 MPa, including near-critical states. From these data, the critical locus has been determined and correlated over its entire length. The VLE data are correlated with the Peng-Robinson equation of state (PR-EoS), using a temperature-dependent binary interaction parameter, and also compared with the predictions of the GERG-2008 equation of state. The former represents the phase compositions across all isotherms with a root-mean-square molefraction deviation of S = 0.0075 while, for the latter, S = 0.0126. Measurements of the three-phase solidvapor-liquid equilibrium (SVLE) line are reported at temperatures from approximately (204 to 216) K and a new correlation is developed which is valid from 145 K to the triple point of CO2. Additionally, we report the partitioning of trace levels of H2S between coexisting liquid and vapor phases of the (CO2 + CH4) system and compare the results with the predictions of the PR-EoS.

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Section: The Critical Line Of the (Co 2 + Ch 4 ) Systemsupporting

confidence: 85%

Section: The Critical Line Of the (Co 2 + Ch 4 ) Systemmentioning

confidence: 97%

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Vapor-liquid equilibria, solid-vapor-liquid equilibria and H2S partition coefficient in (CO2 + CH4) at temperatures between (203.96 and 303.15) K at pressures up to 9 MPa

Souza

Ghafri

Fandiño

et al. 2020

Fluid Phase Equilibria

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“…Highly accurate phase equilibrium measurements of the binary mixtures CO2 + N2 [9], CO2 + O2 [10], CO2 + CH4 [11], CO2 + Ar [12], and CO2 + CO [13] have been important results of this work so far., using a facility specifically designed for accurate phase equilibrium measurements for CCS called CO2Mix [14]. In total, more than 23 isotherms have been measured with this setup, ranging in temperature from -60 to 30 °C and up to 182 bar in pressure, mostly in areas without data or with data in need of verification.…”

Section: Introductionmentioning

confidence: 97%

Need and Measurements of Accurate Thermodynamic Data for CCS

et al. 2019

Self Cite

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For more efficient, robust and inexpensive CCS systems, improvements of the models describing the behavior of fluids involved in CCS are required. Accurate models in turn require experimental data of high quality, which are still lacking for many important properties when impurities are present. SINTEF Energy Research and the Norwegian CCS Research Centre (NCCS) are addressing the lack of phase equilibrium data in CCS by performing accurate measurements of important systems using a purpose-built setup. So far, the binary mixtures of CO2 + N2, CO2 + O2, CO2 + CH4, CO2 + Ar, and CO2 + CO have been investigated. In the present paper, some examples from the measurements on CO2 + Ar and CO2 + CO systems are provided, illustrating that trusting models could lead to serious consequences if they are not supported by independently verified data.

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“…However, two major deficiencies were identified: first, some binary systems present large regions without data; second, there are significant discrepancies between different data sources. Despite some recent improvements in the data situation, including Tsankova et al [21,22] and Løvseth et al [23] on (CO2 + Ar), Petropoulo et al [24] on (CO2 + CH4), and Tsankova et al [25], Westman et al [26] and Souza et al [27] on (CO2 + CO), these deficiencies remain.…”

Section: Introductionmentioning

confidence: 99%

Experimental density and an improved Helmholtz-energy-explicit mixture model for (CO2 + CO)

2019

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This study reports new density measurements of the (CO2 + CO) system at temperatures from (283 to 373) K and pressures up to 48 MPa for four different mixtures, with compositions ranging from (5 to 50) mol% CO. A commercial vibrating-tube densimeter was used to measure the density of each mixture as a function of pressure and temperature. Temperature and pressure were measured with expanded uncertainties (k = 2) of 0.05 K and 0.035 MPa, respectively. The relative combined expanded uncertainty (k = 2) of the density was estimated to be between (0.2 and 1.8) %, with values ≤ 1 % for most state points. The new data significantly expand the pressure and composition ranges of the available density data for the (CO2 + CO) system. Together with recently published vapourliquid-equilibrium data, the new data enabled the development of an improved Helmholtz-energyexplicit mixture model. The new model is based on the mathematical approach of the GERG-2008 and EOS-CG models with new adjustable parameters. As a result, the new mixture model allows for a significantly more accurate description of the thermodynamic properties of the (CO2 + CO) system than GERG-2008 and EOS-CG. A detailed comparison among our density data, experimental data from the literature and the different mixture models is presented.

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Vapor - liquid equilibrium of the carbon dioxide/methane mixture at three isotherms

Cited by 16 publications

References 34 publications

Vapor-liquid equilibria, solid-vapor-liquid equilibria and H2S partition coefficient in (CO2 + CH4) at temperatures between (203.96 and 303.15) K at pressures up to 9 MPa

Vapor-liquid equilibria, solid-vapor-liquid equilibria and H2S partition coefficient in (CO2 + CH4) at temperatures between (203.96 and 303.15) K at pressures up to 9 MPa

Need and Measurements of Accurate Thermodynamic Data for CCS

Experimental density and an improved Helmholtz-energy-explicit mixture model for (CO2 + CO)

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Vapor - liquid equilibrium of the carbon dioxide/methane mixture at three isotherms

Cited by 16 publications

References 34 publications

Vapor-liquid equilibria, solid-vapor-liquid equilibria and H2S partition coefficient in (CO2 + CH4) at temperatures between (203.96 and 303.15) K at pressures up to 9 MPa

Vapor-liquid equilibria, solid-vapor-liquid equilibria and H2S partition coefficient in (CO2 + CH4) at temperatures between (203.96 and 303.15) K at pressures up to 9 MPa

Need and Measurements of Accurate Thermodynamic Data for CCS

Experimental density and an improved Helmholtz-energy-explicit mixture model for (CO2 + CO)

Contact Info

Product

Resources

About

Experimental density and an improved Helmholtz-energy-explicit mixture model for (CO2 + CO)