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

IN SITU NMR MEASUREMENT OF CH4 + C2H6 HYDRATE REFORMATION Ohno, Hiroshi; Dec, Steven F.; Sloan, E. Dendy; Koh, Carolyn A.

Abstract

The reformation of methane-ethane hydrate was observed in situ using 13C MAS NMR spectroscopy. In all reformation experiments, structure I (stable state for the reformation conditions) reformed, and the hydrate cage occupancy ratios were found to be almost the same as those predicted by a statistical thermodynamics program CSMGem, suggesting that there is no preferential formation of large or small cages on the relatively long time scale of this NMR experiment. It was also found that the reformation rate of the sample with PVCap is several times faster compared with the pure system, indicating that the presence of PVCap promotes the hydrate reformation at a high subcooling though this chemical is well-known as a good hydrate inhibitor.

Item Metadata

Title
IN SITU NMR MEASUREMENT OF CH4 + C2H6 HYDRATE REFORMATION
Creator
Ohno, Hiroshi; Dec, Steven F.; Sloan, E. Dendy; Koh, Carolyn A.
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
The reformation of methane-ethane hydrate was observed in situ using 13C MAS NMR spectroscopy. In all reformation experiments, structure I (stable state for the reformation conditions) reformed, and the hydrate cage occupancy ratios were found to be almost the same as those predicted by a statistical thermodynamics program CSMGem, suggesting that there is no preferential formation of large or small cages on the relatively long time scale of this NMR experiment. It was also found that the reformation rate of the sample with PVCap is several times faster compared with the pure system, indicating that the presence of PVCap promotes the hydrate reformation at a high subcooling though this chemical is well-known as a good hydrate inhibitor.
Extent
576238 bytes
Subject
Natural gases; Gas hydrates; Kinetic inhibitors
Genre
Conference Paper
Type
Text
File Format
application/pdf
Language
eng
Date Available
2016-11-21
Provider
Vancouver : University of British Columbia Library
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International
DOI
10.14288/1.0040977
URI
http://hdl.handle.net/2429/1139
Affiliation
Non UBC
Citation
Ohno, Hiroshi; Dec, Steven F.; Sloan, E. Dendy; Koh, Carolyn A. 2008. IN SITU NMR MEASUREMENT OF CH4 + C2H6 HYDRATE REFORMATION. 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
Sloan, E. Dendy; Koh, Carolyn A.; Dec, Steven F.
Rights URI
http://creativecommons.org/licenses/by-nc-nd/4.0/
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DSpace

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Attribution-NonCommercial-NoDerivatives 4.0 International