A model for prediction of gas hydrate formation conditions in aqueous solutions containing electrolytes and/or alcohol

Nasrifar, Khashayar; Moshfeghian, Mahmood

doi:10.1006/jcht.2000.0811

Cited by 64 publications

(37 citation statements)

References 27 publications

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“…where η 1 , η 2 , η 3 are equal to 0.3411, 22.33 and 899683.5 for CO 2 , which can be found in the study of Nasrifar et al [32]. Figure 9 shows the comparison between the experimental data and the prediction results.…”

Section: Prediction Of Hydrate Equilibrium Condition By the Improved mentioning

confidence: 71%

“…In this model, the mechanical equilibrium of force between the interfaces in hydrate-liquid-vapor system was considered. The solubility of CO 2 gas was calculated using an empirical modification of Krichevsky-Kasarnovsky (K-K) equation [32]. This equation also includes the effect of pressure on the solubility.…”

Section: Prediction Of Hydrate Equilibrium Condition By the Improved mentioning

confidence: 99%

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Characteristics of CO2 Hydrate Formation and Dissociation in Glass Beads and Silica Gel

2014

Carbon Capture and Storage

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CO 2 hydrate formation and dissociation is crucial for hydrate-based CO 2 capture and storage. Experimental and calculated phase equilibrium conditions of carbon dioxide (CO 2 ) hydrate in porous medium were investigated in this study. Glass beads were used to form the porous medium. The experimental data were generated using a graphical method. The results indicated the decrease of pore size resulted in the increase of the equilibrium pressure of CO 2 hydrate. Magnetic resonance imaging (MRI) was used to investigate the priority formation site of CO 2 hydrate in different porous media, and the results showed that the hydrate form firstly in BZ-02 glass beads under the same pressure and temperature. An improved model was used to predict CO 2 hydrate equilibrium conditions, and the predictions showed good agreement with experimental measurements.

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Section: Prediction Of Hydrate Equilibrium Condition By the Improved mentioning

confidence: 71%

Section: Prediction Of Hydrate Equilibrium Condition By the Improved mentioning

confidence: 99%

Characteristics of CO2 Hydrate Formation and Dissociation in Glass Beads and Silica Gel

2014

Carbon Capture and Storage

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“…The improved model of Song et al [15] was derived from the traditional model of van der Waals and Plateeuw [28] and the methods proposed by Henry et al [31], Clarke et al [30], and Nasrifar [35]. The traditional model of van der Waals and Plateeuw [28] was based on the bulk hydrate.…”

Section: Comparison Between the Experimental Results And Thermodynamicmentioning

confidence: 99%

“…When hydrate was formed in a porous medium, Henry et al [31] gave the expression of the capillary pressure effect on the chemical potential difference between the empty hydrate lattice and the pure water phases. In the presence of electrolyte solutions, the models of Englezos and Bishnoi [32], Nasrifar et al [33], Javanmardi and Moshfeghian [34], Nasrifar [35], Masoudi et al [36], Sun et al [37,38], and Mohammadi et al [39,40] can be used. Considering the experimental conditions, a model combining the model for a porous medium and the model for the presence of an electrolyte may be used.…”

Section: Comparison Between the Experimental Results And Thermodynamicmentioning

confidence: 99%

“…Henry et al [31] and Clarke et al [30] improved the traditional model by introducing the solution of the capillary effects of porous media. The traditional model was further improved by Nasrifar [35], treating the presence of an electrolyte in the liquid phase. Song et al [15] combined these models and proposed an improved model, for which the mechanical equilibrium of force between the interfaces in the hydrate-liquid-vapor system was considered.…”

Section: Comparison Between the Experimental Results And Thermodynamicmentioning

confidence: 99%

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Effects of Halogen Ions on Phase Equilibrium of Methane Hydrate in Porous Media

et al. 2012

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The influences of halogen ions extracted from sodium fluoride, sodium chloride, sodium bromide, and sodium iodide and their concentrations on methane hydrate phase equilibrium conditions in porous media were investigated experimentally using an orthogonal test method at a pressure of 8 MPa. The experimental results showed that the equilibrium temperature of methane hydrate decreased when halogen ions were added. The equilibrium temperature decreased with the increase of halogen ion concentrations. The influence of the sources of the halogens ion to the methane hydrate equilibrium temperature were insensitive according to variance analysis, which could be explained by about the same mean ionic activity coefficient (a dimensionless coefficient relates the activity to a measured concentration) of sodium fluoride, sodium chloride, sodium bromide, and sodium iodide. The experimental measurements were also in close agreement with the thermodynamic model of Song et al. (J. Nat. Gas Chem. 19, 241 (2010)), in which the mechanical equilibrium of force between the interfaces in a hydrate-liquid-vapor system was considered.

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Hydrate phase equilibrium for CH₄‐CO₂‐H₂O system in porous media

et al. 2016

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CO2/CH4 replacement in hydrate exploitation is considered a promising method to enhance natural gas production and mitigate the greenhouse effect. Since the gas concentration in mining hydrate sediment changes with the displacement process, it is crucial to investigate the hydrate formation and dissociation characteristics with the presence of different gas mixtures. To obtain fundamental thermodynamic data, CO2/CH4 gas mixture hydrate phase equilibrium conditions in porous media were experimentally investigated. The experiments were conducted at 276.55–284.85 K and 2.10–6.80 MPa using an isochoric method with different CO2/CH4 gas mixture compositions (CO2 mole fractions were 0.798, 0.499, and 0.199 mol/mol (79.8, 49.9, and 19.9 mol%)). The results showed that gas mixtures with higher CO2 mole fractions had lower hydrate equilibrium pressure (p) under the same temperature (T) according to the experimental data. The two different porous media used in the experiments had a slight influence on gas mixture hydrate phase equilibrium conditions. An improved thermodynamic model was proposed to calculate the CO2/CH4 hydrate phase equilibrium conditions in porous media, and the prediction results fitted closely to the experimental data.

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A model for prediction of gas hydrate formation conditions in aqueous solutions containing electrolytes and/or alcohol

Cited by 64 publications

References 27 publications

Characteristics of CO2 Hydrate Formation and Dissociation in Glass Beads and Silica Gel

Characteristics of CO2 Hydrate Formation and Dissociation in Glass Beads and Silica Gel

Effects of Halogen Ions on Phase Equilibrium of Methane Hydrate in Porous Media

Hydrate phase equilibrium for CH₄‐CO₂‐H₂O system in porous media

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A model for prediction of gas hydrate formation conditions in aqueous solutions containing electrolytes and/or alcohol

Cited by 64 publications

References 27 publications

Characteristics of CO2 Hydrate Formation and Dissociation in Glass Beads and Silica Gel

Characteristics of CO2 Hydrate Formation and Dissociation in Glass Beads and Silica Gel

Effects of Halogen Ions on Phase Equilibrium of Methane Hydrate in Porous Media

Hydrate phase equilibrium for CH4‐CO2‐H2O system in porous media

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Hydrate phase equilibrium for CH₄‐CO₂‐H₂O system in porous media