The vapor-liquid water-
hydrate (V-Lw-H) phase equilibria are essential for multiple pro
cesses involving methane substitution by
carbon dioxide. This work developed a model to predi
ct the multiphase equilibria of CH
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2O systems using mole
cule-based statisti
cal asso
ciation fluid theory (SAFT2) equation of states for the vapor and liquid phases and the statisti
cal model by van der Waals-Platteeuw for the
hydrate phase. The multiphase equilibria for CO
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2O and CH
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2O system were modeled for the temperature ranging from 273.15 to 288.15 K (13&
ndash;700 bar) and 273.15 K to 299.15 K (26&
ndash;500 bar), respe
ctively. The CH
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2O system were modeled at various temperatures ranging from 273.15 to 286.15 K (12&
ndash;101 bar) with various CO
2 con
centrations. In addition, the solubility of CH
4 and CO
2 under
hydrate phase equilibria was
computed in the temperatures of 273.15&
ndash;286.15 K. The o
ccupan
cy of CH
4 and CO
2 mole
cules in
hydrate cavities was analyzed based on the
cal
culation of Langmuir
constants. The predi
cted multiphase equilibria and gas solubility are in good agreements with the experimental data with high a
ccura
cy.