| Abstract
| - Using the Gibbs function of reaction, equilibrium pressure, temperature conditions for the formation of methaneclathrate hydrate have been calculated from the thermodynamic properties of phases in the system CH4−H2O. The thermodynamic model accurately reproduces the published phase-equilibria data to within ±2 K ofthe observed equilibrium boundaries in the range 0.08−117 MPa and 190−307 K. The model also providesan estimate of the third-law entropy of methane hydrate at 273.15 K, 0.1 MPa of 56.2 J mol-1 K-1 for 1/nCH4·H2O, where n is the hydrate number. Agreement between the calculated and published phase-equilibriadata is optimized when the hydrate composition is fixed and independent of the pressure and temperature forthe conditions modeled.
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