Critical properties of CO2, CHF3, SF6, (CO2+ CHF3), and (CHF3+ SF6)

Diefenbacher, A.; Crone, Marlene; Türk, Michael

doi:10.1006/jcht.1997.0320

Cited by 28 publications

(7 citation statements)

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“…Our PVTx measurements by the isochoric methods for the respective CO 2 + HFCs and N 2 O + HFCs systems − at temperatures higher than SLE data showed that systems are showing small positive deviations in terms of Raoult's law; a very few additional VLE data from the literature for some CO 2 + HFCs, − measured at an even much higher temperature range than our data, showed a little bit greater but also positive deviations from Raoult's law. A comparable analysis of deviations from Raoult's law of all existing data for systems was considered (VLE and our isochoric) and showed that they have a slight trend of decreasing with the lowering of temperature.…”

Section: Representation Of the Liquidus By The Schröder Equationsupporting

confidence: 42%

Liquidus in the CO₂ + and N₂O + Hydrofluorocarbon Systems

2010

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The present paper summarizes and reinterprets the results for a series of measurements of solid−liquid equilibria for binary systems formed by carbon dioxide or nitrous oxide with a series of hydrofluorocarbons (fluoromethane, difluoromethane, trifluoromethane, pentafluoromethane, 1,1,1,2-tetrafluoroethane, 1,1,1-trifluoroethane, and 1,1-difluoroethane). All of the systems form eutectics. The contribution from heat capacity and activity coefficients to the liquidus courses represented by the Schröder equation were analyzed for each system included in the present study. The performed analysis showed that both mentioned contributions are small and, to a great extent, are mutually compensating each other and thus could be disregarded. The results showed that, for the systems under study, the liquidus curve down to the eutectic point may be represented by the Schröder equation involving two quantities only: the temperature at triple point and the enthalpy of fusion of the system components.

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Section: Representation Of the Liquidus By The Schröder Equationsupporting

confidence: 42%

Liquidus in the CO₂ + and N₂O + Hydrofluorocarbon Systems

2010

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“…Critical loci in binary systems containing halocarbons. Points–experimental data. − Solid lines–CP-PC-SAFT and dashed lines–CS-SAFT-VR-Mie. k 12 = 0 for both models.…”

Section: Resultsmentioning

confidence: 99%

Implementation of CP-PC-SAFT and CS-SAFT-VR-Mie for Predicting Thermodynamic Properties of C₁–C₃ Halocarbon Systems. I. Pure Compounds and Mixtures with Nonassociating Compounds

Polishuk

Chiko

Cea-Klapp

et al. 2021

Ind. Eng. Chem. Res.

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This study compares the estimations of two predictive approaches, namely, CP-PC-SAFT and CS-SAFT-VR-Mie for vapor pressures, saturated and high-pressure densities, sound velocities, isobaric and isochoric heat capacities of 17 representative substituted fluoro- and chloromethanes, ethanes, ethenes, propanes, and propenes, whose data are available under a wide range of conditions. Predictions of vapor–liquid equilibria (VLE) in their binary systems comprising inter alia carbon dioxide, hydrocarbons, and light gas systems with k 12 = 0 are considered as well. These models do not incorporate associative and polar interactions, which allows parametrization based on the particularly limited amount of literature data. It is demonstrated that although the overall accuracies of the considered approaches are reasonably good, each of them has their advantages and disadvantages. For example, SAFT-VR-Mie typically predicts more accurately some VLE in the symmetric systems, while CP-PC-SAFT is advantageous in estimating phase behavior of the asymmetric ones. Both models can be applied for preliminary estimation of unavailable halocarbon data for which each of them exhibits a relative superiority. In addition to this, it is demonstrated that SAFT-VR-Mie attached by square gradient theory with predictive correlation for influence parameters accurately estimates surface tensions of the considered compounds.

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“…A detailed description of the apparatus and the experimental procedure for determining the critical state by observation of the critical opalescence can be found elsewhere. (2)(3)(4) With the present apparatus it is possible to determine the critical temperature within ± 60 mK and the critical pressure within ± 6 kPa. The experimental uncertainty in the determination of the critical density is less than ± 2 per cent.…”

Section: Methodsmentioning

confidence: 99%

“…The critical properties of the pure substances CO 2 , CHF 3 , and SF 6 , and {xCO 2 + (1 − x)CHF 3 } and {xCHF 3 + (1 − x)SF 6 } have been the subject of a previous publication. (2) The critical loci of the mixtures are illustrated as a function of composition, and a calculation procedure based on cubic equations of state is reported using only the experimental critical data for the pure components and for one mixture with x ≈ 0.5. The capability of these equations of state to represent densities in the supercritical region and to give a qualitative representation of the excess volume is discussed in comparison with experimental data of other authors.…”

Section: Introductionmentioning

confidence: 99%

Critical (p , ρ , T) properties of CH2F2, {xCO2+(1−x) SF6}, {xSF6+(1−x) CH2F2}, and {xCHF3+(1−x) CH2F2}

Diefenbacher

Türk

1999

The Journal of Chemical Thermodynamics

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Critical properties of CO2, CHF3, SF6, (CO2+ CHF3), and (CHF3+ SF6)

Cited by 28 publications

References 0 publications

Liquidus in the CO₂ + and N₂O + Hydrofluorocarbon Systems

Liquidus in the CO₂ + and N₂O + Hydrofluorocarbon Systems

Implementation of CP-PC-SAFT and CS-SAFT-VR-Mie for Predicting Thermodynamic Properties of C₁–C₃ Halocarbon Systems. I. Pure Compounds and Mixtures with Nonassociating Compounds

Critical (p , ρ , T) properties of CH2F2, {xCO2+(1−x) SF6}, {xSF6+(1−x) CH2F2}, and {xCHF3+(1−x) CH2F2}

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Critical properties of CO2, CHF3, SF6, (CO2+ CHF3), and (CHF3+ SF6)

Cited by 28 publications

References 0 publications

Liquidus in the CO2 + and N2O + Hydrofluorocarbon Systems

Liquidus in the CO2 + and N2O + Hydrofluorocarbon Systems

Implementation of CP-PC-SAFT and CS-SAFT-VR-Mie for Predicting Thermodynamic Properties of C1–C3 Halocarbon Systems. I. Pure Compounds and Mixtures with Nonassociating Compounds

Critical (p , ρ , T) properties of CH2F2, {xCO2+(1−x) SF6}, {xSF6+(1−x) CH2F2}, and {xCHF3+(1−x) CH2F2}

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Liquidus in the CO₂ + and N₂O + Hydrofluorocarbon Systems

Liquidus in the CO₂ + and N₂O + Hydrofluorocarbon Systems

Implementation of CP-PC-SAFT and CS-SAFT-VR-Mie for Predicting Thermodynamic Properties of C₁–C₃ Halocarbon Systems. I. Pure Compounds and Mixtures with Nonassociating Compounds