Hydrate phase equilibria for the CO2, CH4 and natural gas in silica gel pores of nominal pore
diameters 6, 30 and 100 nm were measured, and compared with the calculated results based on
van der Waals and Platteeuw model. At a specific temperature, three-phase hydrate–water-rich
liquid–vapor (HLV) equilibrium curves for pore hydrates were shifted to the higher pressure
condition depending on pore sizes when compared with those of bulk hydrates. The activities of
water in porous silica gels were modified to account for capillary effect, and the calculated results
were in good agreement with the experimental data. To investigate the formation kinetics of each
system, the isobaric method was applied. It was found that there were no difference in structure
between hydrate in silica gel pore and that in bulk free state. Results showed that hydrate
formation in the silica gel pores indicated significantly faster rates, intensively reduced induction
times, increased gas consumption and conversion of water to hydrate as compared to hydrate
formation in bulk free water or fine ice powder. Utilizing these superior characteristics, formation
of hydrate in porous material is expected to present the process on gas separation or storage.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:BVAU.2429/1176 |
| Date | 07 1900 |
| Creators | Kang, Seong-Pil, Seo, Yutaek |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | text |
| Rights | Kang, Seong-Pil |
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