Methane hydrate equilibria in silica gels with broad pore-size distributions

Equilibrium pressures for the dissociation of methane hydrates confined in silica gel pores of nominal radii 7.5, 5.0 and 3.0 nm were measured over a wide temperature range, and were observed to be higher than those for bulk methane hydrate. A model is presented that allows the pore radius involved...

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Bibliographic Details
Published in:AIChE journal 2002-02, Vol.48 (2), p.393-400
Main Authors: Smith, Duane H., Wilder, Joseph W., Seshadri, Kal
Format: Article
Language:English
Subjects:
Chemical thermodynamics
Chemistry
Elements, mineral and organic compounds
Exact sciences and technology
General and physical chemistry
Others (including liquid-liquid-vapor equilibria)
Phase equilibria
Thermodynamic properties
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Summary:Equilibrium pressures for the dissociation of methane hydrates confined in silica gel pores of nominal radii 7.5, 5.0 and 3.0 nm were measured over a wide temperature range, and were observed to be higher than those for bulk methane hydrate. A model is presented that allows the pore radius involved in each equilibrium to be determined from these data, so that the model exactly reproduces the experimental equilibrium pressure. Based on this model, pore volume distributions were reconstructed and found to be in good agreement with those obtained from nitrogen desorption isotherms, indicating that hydrate formed nearly uniformly in the available pores.
ISSN:0001-1541
1547-5905
DOI:10.1002/aic.690480222