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DISSOCIATION AND SPECIFIC HEATS OF GAS HYDRATES UNDER SUBMARINE AND SUBLACUSTRINE ENVIRONMENTS

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Title: DISSOCIATION AND SPECIFIC HEATS OF GAS HYDRATES UNDER SUBMARINE AND SUBLACUSTRINE ENVIRONMENTS
Author: Nakagawa, Ryo; Hachikubo, Akihiro; Shoji, Hitoshi
Subject Keywords gas hydrates;dissociation heat;specific heat;methane;ethane;ICGH 2008;International Conference on Gas Hydrates 2008
Issue Date: 2008-07
Publicly Available in cIRcle 2008-10-20
Citation: Nakagawa, Ryo; Hachikubo, Akihiro; Shoji, Hitoshi. 2008. DISSOCIATION AND SPECIFIC HEATS OF GAS HYDRATES UNDER SUBMARINE AND SUBLACUSTRINE ENVIRONMENTS. Proceedings of the 6th International Conference on Gas Hydrates (ICGH 2008), Vancouver, British Columbia, CANADA, July 6-10, 2008.
Abstract: Dissociation and specific heats of synthetic methane and ethane hydrates were measured under high-pressure condition by using a heat-flow type calorimeter to understand thermodynamic properties of gas hydrates under submarine/sublacustrine environments. Ice powder was put into the sample cell and pressurized by methane and ethane up to 5MPa and 2MPa, respectively. After the completion of gas hydrate formation, samples were heated from 263K to 288K at the rate of 0.01 K min-1. Large negative peaks of heat flow corresponded to the dissociation of gas hydrates were detected in a temperature range 279-282K at a pressure of 5MPa for methane hydrate and 283-286K at 2MPa for ethane hydrate, respectively. We also obtained the specific heats of gas hydrates in the range 264-276K for methane and 264-282K for ethane under pressure.
Affiliation: OtherOther
URI: http://hdl.handle.net/2429/2695
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