Methane Content of Water in Equilibrium with Hydrates

3 Methane Content of Water in Equilibrium with Hydrates 

Data and predictions for methane dissolved in water, solely in equilibrium with hydrates (Lw-H without a vapor phase) find application in instances such as formation of hydrates in marine systems (Chapter 7). To date there are only few reliable hydrate data in equilibrium with water containing methane—the data of Servio and Englezos (2002) and Chou et al. (Personal Communication, December 18, 2006), as listed in Chapter 6. 

Because there are so few data for the methane content of water in equilibrium with hydrate (Lw-H) regions, their accuracy cannot be determined. These data are very difficult to obtain due to the low methane concentrations (typically 100 ppm mol). The inaccuracies in normal experimental data in other phase regions are frequently greater than the absolute values of the water content in the Lw-H region. 

As in the previous sections, it is worthwhile to compare these data against the predictions of CMSGem and User Manual, included on the CD in the endpapers, with examples in Appendix A. 

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