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Geochemical Journal
Geochemical Journal An open access journal for geochemistry
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Equilibrium conditions for gas hydrates of methane and ethane mixtures in pure water and sodium chloride solution

Tatsuo Maekawa
Geochemical Journal, Vol. 35, No. 1, P. 59-66, 2001

ABSTRACT

The equilibrium conditions were experimentally determined for gas hydrate of methane and ethane mixtures in pure water and 3.0 wt% NaCl solution. The present results indicate that the addition of ethane stabilizes gas hydrate and shifts the equilibrium conditions to higher temperature and lower pressure. As ethane concentration increases from 0 vol% to 10 vol%, the equilibrium pressure of gas hydrate decreases non-proportionally with gas composition, which implies a change in the hydrate structure over this range of gas composition. The equilibrium temperature of gas hydrates of methane and ethane mixtures in 3.0 wt% NaCl solution is approximately 1.0 K lower than that in pure water at a constant pressure.

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