This paper reports the three-phase (ice + hydrate + guest-rich vapor) equilibrium pressure-temperature conditions at temperatures (243 to 272) K in the systems of water and each of the following two ternary gas mixtures of methane, ethane, and propane: 90:7:3 molar ratio and 99.48:0.5:0.02 molar ratio. The former is a simulated natural gas (natural-gas composition). The latter has a methane-rich composition that is equal to that of the vapor phase in equilibrium with the clathrate hydrate that has the guest composition of 90:7:3 molar ratio. The pressure ranges of the present measurements in the two systems are (0.233 to 0.711) MPa in the natural-gas-composition gas mixture system and (0.939 to 2.070) MPa in the methane-rich-composition gas mixture system. The measurements were carried out using the batch, isochoric procedure. The measured data were compared with the corresponding predictions using phase equilibrium calculation programs.
ASJC Scopus subject areas
- 化学 (全般)