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

International Conference on Gas Hydrates (ICGH) (6th : 2008)

DISSOCIATION AND SPECIFIC HEATS OF GAS HYDRATES UNDER SUBMARINE AND SUBLACUSTRINE ENVIRONMENTS Nakagawa, Ryo; Hachikubo, Akihiro; Shoji, Hitoshi

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.

Item Metadata

Title	DISSOCIATION AND SPECIFIC HEATS OF GAS HYDRATES UNDER SUBMARINE AND SUBLACUSTRINE ENVIRONMENTS
Creator	Nakagawa, Ryo; Hachikubo, Akihiro; Shoji, Hitoshi
Contributor	University of British Columbia. Department of Chemical and Biological Engineering; International Conference on Gas Hydrates (6th : 2008 : Vancouver, B.C.)
Date Issued	2008-07
Description	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.
Extent	182396 bytes
Subject	Gas hydrates; Dissociation heat; Specific heat; Methane; Ethane
Genre	Conference Paper
Type	Text
File Format	application/pdf
Language	eng
Date Available	2008-10-20
Provider	Vancouver : University of British Columbia Library
Rights	Attribution-NonCommercial-NoDerivatives 4.0 International
DOI	10.14288/1.0041144
URI	http://hdl.handle.net/2429/2695
Affiliation	Non UBC
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.
Peer Review Status	Unreviewed
Copyright Holder	Hachikubo, Akihiro
Rights URI	http://creativecommons.org/licenses/by-nc-nd/4.0/
Aggregated Source Repository	DSpace

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International Conference on Gas Hydrates (ICGH) (6th : 2008)