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Studies of CO_2 Hydrate Formation and Dissolution

North, Wheeler J. and Blackwell, Veronica R. and Morgan, James J. (1998) Studies of CO_2 Hydrate Formation and Dissolution. Environmental Science and Technology, 32 (5). pp. 676-681. ISSN 0013-936X.

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Sequestering waste CO_2 in the deep ocean as a gas, liquid, or hydrate has been variously proposed (1−3). We describe experiments producing CO_2 hydrate that may eventually assist in developing methodology for large-scale creation of this ice-like substance. We produced a simple and inexpensive system for conducting high-pressure experimentation. We established the minimum ratio of CO_2 to water (both deionized water and seawater) needed to produce stable traces of hydrate. We suggested an explanation for the differences observed in forming hydrate from the two media. We demonstrated that hydrate decomposed when exposed to an intermittent flow of water. We proposed a model of pathways involved in forming CO_2 hydrate. Previous reports on hydrate formation have emphasized pressure−temperature relationships and effects thereon. Our experimentation focused on the amount of CO_2 in all phases inside the pressure chamber (designated as Υ-CO_2). The minimum Υ-CO_2 needed for producing hydrate varied with pressure. Hydrate became unstable and decomposed in intermittently flowing water. Our approach has yielded new information regarding requirements for hydrate formation and the potential for dissolution in the deep ocean.

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Additional Information:© 1998 American Chemical Society. Received for review June 2, 1997. Revised manuscript received December 3, 1997. Accepted December 10, 1997. Publication Date (Web): January 22, 1998. Assistance from Dwain F. Spencer, Don E. Johnson, and staff of the Kerckhoff Marine Laboratory is gratefully acknowledged. The research was supported by a grant from the Electric Power Research Institute. Laurence G. Jones prepared the diagrams.
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Electric Power Research Institute (EPRI)UNSPECIFIED
Issue or Number:5
Record Number:CaltechAUTHORS:20180510-154903422
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Official Citation:Studies of CO2 Hydrate Formation and Dissolution. Wheeler J. North, Veronica R. Blackwell, and James J. Morgan. Environmental Science & Technology 1998 32 (5), 676-681 DOI: 10.1021/es970483f
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:86359
Deposited By: Tony Diaz
Deposited On:10 May 2018 22:53
Last Modified:03 Oct 2019 19:42

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