Water Content of Vapor in Equilibrium with Hydrate

1 Water Content of Vapor in Equilibrium with Hydrate 

The water content of the vapor phase in (H-V) equilibrium is very small (typically less than 0.001 mole fraction) and therefore difficult to measure accurately. As a consequence, in the history of gas processing, semilogarithmic straight lines (gas water content versus reciprocal absolute temperature) from the Lw-V region were extrapolated into the H-V region with limited justification. 

Laboratory confirmation that the water content of gas in equilibrium with hydrate should be much lower than the extrapolated values has been verified by Sloan et al. (1976) for methane hydrates, and by Song and Kobayashi (1982) for 

With the above complexities, a comprehensive water content chart (or series of charts) for gases of differing compositions would be problematic. Further, the data are so sparse that mathematical methods for determining the water content of gases in the V-H region should be considered to fit to a small amount 

It is worthwhile to emphasize that all of the available data for V-H studies have been for methane-rich gases. For heavier gases, or for noncombustible gases, there are almost no data in the V-H two-phase region the sole exception is the water content study of Song and Kobayashi (1987) for carbon dioxide. 

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