Modeling Hydrate Formation in Media with Broad Pore Size Distributions

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• 作者：Joseph W. Wilder ; Kal Seshadri ; and Duane H. Smith
• 刊名：Langmuir
• 出版年：2001
• 出版时间：October 16, 2001
• 年：2001
• 卷：17
• 期：21
• 页码：6729 - 6735
• 全文大小：129K
• 年卷期：v.17,no.21(October 16, 2001)
• ISSN：1520-5827

文摘

We show how the modification by Henry et al. of the earlier van der Waals-Plateeuw thermodynamicmodel can be used to interpret data for hydrates in small pores even when there is a broad distributionof pore sizes. Pore size distribution effects explain the previously reported discrepancy between calculatedand measured equilibrium pressures for nominal 7.5 nm radius pores. On the basis of the model, porevolume distributions are reconstructed for the silica gel samples in which the hydrates were formed andcompared with distributions constructed from desorption isotherms. The excellent agreement between thecalculations and experimental data supports the interpretation of how the pore size distribution presentin the silica gel samples affects the observed equilibrium pressures.