Abstract
This report describes the effects of diethylene glycol monoethyl ether acetate on the thermodynamic stability of methane hydrate. We measured the hydrate equilibrium conditions for water + diethylene glycol monoethyl ether acetate + methane at pressures (3.65 to 9.25) MPa and temperatures of (274.7 to 284.2) K. The addition of diethylene glycol monoethyl ether acetate into the water + methane system shifts the hydrate equilibrium conditions to a lower temperature and higher pressure region, suggesting that diethylene glycol monoethyl ether acetate plays a role of thermodynamic inhibitor for methane hydrate formation. Hydrate crystals formed in the system of water + diethylene glycol monoethyl ether acetate + methane show the same crystallographic characteristics as pure methane hydrate does. Furthermore, we demonstrate that contact with liquid diethylene glycol monoethyl ether acetate on methane hydrate promotes methane hydrate dissociation even if methane hydrate is in a thermodynamically stable condition.
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