Experimental phase behavior and solubility parameter for crude oil + methane [T = 311.15–373.15 K] and crude oil + methane + CO2 mixtures [T = 343.15–383.15 K]

Yanes, José Francisco Romero; Costa, Moacir F.L. da; Sampaio, João P.G.; Valero, Angélica Maria Chacón; Feitosa, Filipe Xavier; Sant’Ana, Hosiberto Batista de

doi:10.1016/j.fuel.2020.119675

Cited by 10 publications

(10 citation statements)

References 38 publications

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“…The methane solubility parameters from this study fall between the literature values. The change in solubility parameter with temperature is similar to that predicted by Romero-Yanes et al 3 However, contrary to expectation, the solubility parameters are independent of pressure. The component solubility parameter correlations in the MRS model have the following functional form k T ( 298)…”

Section: Resultssupporting

confidence: 86%

“…where ΔU vap is the internal energy of vaporization (J/mol), MW is molecular weight (g/mol), and ρ is density (g/cm 3 ). The solubility parameter is proportional to the square root of density; therefore, for a compressible fluid, it depends indirectly on pressure.…”

Section: Resultsmentioning

confidence: 99%

“…11 Effective liquid molar volumes for the methane were used in the determination of the solubility parameter. The values from Romero-Yanes et al 3 were calculated from the solubility parameter equation derived from an equation of state solved with molar volumes from a property database. The range in reported solubility parameters indicates that the magnitude of the methane solubility parameter depends on the method used to estimate it and the method to determine the molar volumes used in the calculation.…”

Section: Resultsmentioning

confidence: 99%

“…However, methane solubility parameters in crude oil have not been determined directly, although they can be estimated from an equation of state. 3 Other approaches can also be used to model asphaltene precipitation including cubic equations of state, 5 cubic plus association, 6 and statistical associating fluid theory (SAFT), 7 but they are outside the scope of this study.…”

Section: Introductionmentioning

confidence: 99%

“…One of Dr. Mather’s interests was solubility, and, in this study, we attempt to determine the solubility parameter of methane, which is often the major component of the dissolved gases in crude oils. Methane has a significant negative impact on a crude oil’s ability to solubilize asphaltenes. − A regular solution-phase equilibrium model is one approach that can be used to quantify this impact, and the solubility parameters of each component are a key input for this model. However, methane solubility parameters in crude oil have not been determined directly, although they can be estimated from an equation of state .…”

Section: Introductionmentioning

confidence: 99%

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Solubility Parameter of Methane in Bitumen

et al. 2021

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Methane solubility parameters are required when using a regular solution approach to predict asphaltene precipitation from crude oils that contain methane. To determine these parameters, asphaltene onsets and yields from mixtures of bitumen, methane, and n-pentane were measured at temperatures of 21 and 130 °C and pressures of 10 and 60 MPa. The onsets (solvent content at which asphaltene precipitation was first observed) were measured by titrating bitumen with a mixture of methane and n-pentane in a high-pressure microscope. Asphaltene yields (mass of asphaltenes divided by mass of bitumen in feed) were measured in a blind cell pressure-volume-temperature apparatus for mixtures with the same methane content as the onset measurements. Saturation pressures were also measured in the blind cell apparatus for the mixtures with methane and were used to ensure that the onset and yield measurements were performed in a vapor-free condition. The onset and yield data were fitted with a Modified Regular Solution (MRS) model. The inputs to the MRS model are temperature, pressure, and the mole fraction, molar volume, and solubility parameters of each component in the mixturein this case, methane, n-pentane, and the bitumen characterized into saturates, aromatics, resins, and asphaltenes. The properties of the nonasphaltene bitumen components and n-pentane were determined from previously established correlations, and the only unknowns were the asphaltene and methane solubility parameters. The respective unknown solubility parameters were determined by fitting the MRS model to asphaltene precipitation data from mixtures of bitumen and n-pentane and from mixtures of bitumen, n-pentane, and methane. The fitted methane solubility parameters ranged from 6.1 to 9.5 MPa0.5 depending on the temperature. A correlation for the parameter was proposed, and the MRS model with this correlation matched the measured onsets and yields with average deviations of 1 wt % solvent and 8 wt % compared with the experimental uncertainties of ±1.5 wt % solvent and ±6 to 11 wt %.

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Section: Resultssupporting

confidence: 86%

Section: Resultsmentioning

confidence: 99%