Enormous amount of latent heat generates/absorbs at the formation/dissociation process of gas
hydrates and controlls their thermal condition themselves. In this paper we investigated the effect
of ethane concentration on dissociation heat of mixed-gas (methane and ethane) hydrate. It has
been reported by researchers that a structure II gas hydrate appears in appropriate gas
composition of methane and ethane. We confirmed by using Raman spectroscopy that our
samples had the following three patterns: structure I only, structure II only and mixture of
structures I and II. Dissociation heats of the mixed-gas hydrates were within the range between
those of pure methane and ethane hydrates and increased with ethane concentration. In most cases
two peaks of heat flow appeared and the dissociation process was divided into two parts. This can
be understood in the following explanation that (1) the sample contained both crystal structures,
and/or (2) ethane-rich gas hydrate formed simultaneously from dissociated gas and showed the
second peak of heat flow.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:BVAU.2429/2694 |
| Date | 07 1900 |
| Creators | Hachikubo, Akihiro, Nakagawa, Ryo, Kubota, Daisuke, Sakagami, Hirotoshi, Takahashi, Nobuo, Shoji, Hitoshi |
| 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 | Hachikubo, Akihiro |
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