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Energies 2012, 5(2), 459-465; doi:10.3390/en5020459
Article

Thermodynamic Stability of Structure H Hydrates Based on the Molecular Properties of Large Guest Molecules

1
,
1
,
2
,
3
 and
1,*
1 Department of Mechanical Engineering, Keio University, Yokohama 223-8522, Japan 2 Steacie Institute for Molecular Sciences, National Research Council of Canada, 100 Sussex Drive, Ottawa, Ontario K1A 0R6, Canada 3 Center for Hydrate Research, Chemical Engineering Department, Colorado School of Mines, Golden, CO 80401, USA
* Author to whom correspondence should be addressed.
Received: 31 December 2011 / Revised: 11 February 2012 / Accepted: 14 February 2012 / Published: 22 February 2012
(This article belongs to the Special Issue Natural Gas Hydrate 2011)
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Abstract

This paper report analyses of thermodynamic stability of structure-H clathrate hydrates formed with methane and large guest molecules in terms of their gas phase molecular sizes and molar masses for the selection of a large guest molecule providing better hydrate stability. We investigated the correlation among the gas phase molecular sizes, the molar masses of large molecule guest substances, and the equilibrium pressures. The results suggest that there exists a molecular-size value for the best stability. Also, at a given molecule size, better stability may be available when the large molecule guest substance has a larger molar mass.
Keywords: clathrate hydrate; structure H; phase equilibria; molecular properties clathrate hydrate; structure H; phase equilibria; molecular properties
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Tezuka, K.; Taguchi, T.; Alavi, S.; Sum, A.K.; Ohmura, R. Thermodynamic Stability of Structure H Hydrates Based on the Molecular Properties of Large Guest Molecules. Energies 2012, 5, 459-465.

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