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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received August 25, 2005
Accepted October 25, 2005

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Phase and kinetic behavior of the mixed methane and carbon dioxide hydrates

Youngjune Park Jaehyoung Lee¹ Kyuchul Shin Jiwoong Seol Kyung-Min Lee Dae-Gee Huh¹ Keun-Pil Park¹ Huen Lee^†

Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Korea ¹Korea Institute of Geoscience and Mineral Resources, 30 Gajeong-dong, Yuseong-gu, Daejeon 305-350, Korea

h_lee@kaist.ac.kr

Korean Journal of Chemical Engineering, March 2006, 23(2), 283-287(5), 10.1007/BF02705728

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Abstract

Large amounts of CH4 are stored as hydrates on continental margins and permafrost regions. If the CH4hydrates could be converted into CO2 hydrate, they would serve double duty as CH4 sources and CO2 storage sites inthe deep ocean sediments. As preliminary investigations, both the phase behavior of CH4 hydrates and kinetic behaviorof CO2 hydrate were measured at versatile conditions that can simulate actual marine sediments. When measuring three-phase equilibria (H-LW-V) containing CH4 hydrate, we also closely examined pore and electrolyte effects of clay andNaCl on hydrate formation. These two effects inhibited hydrate nucleation and thus made the hydrate equilibrium lineshift to a higher pressure region. In addition, the kinetic data of CO2 hydrate in the mixtures containing clay and NaClwere determined at 2.0MPa and 274.15K. Clay mineral accelerated an initial formation rate of CO2 hydrate byinducing nucleation as initiator, but total amount of formed CO2, of course, decreased due to the capillary effect of claypores. Also, the addition of NaCl in sample mixtures made both initial formation rate and total amount of CO2 con-sumption decrease.

Keywords

Natural Gas Hydrate Clathrate Hydrate Methane Carbon Dioxide Clay NaCl

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