逸度
化学
水合物
笼状水合物
热力学
离解(化学)
多孔介质
活度系数
相平衡
多孔性
相(物质)
物理化学
水溶液
有机化学
物理
作者
Xiao‐Sen Li,Yu Zhang,Gang Li,Zhaoyang Chen,Kefeng Yan,Qingping Li
标识
DOI:10.1016/j.jct.2008.04.009
摘要
We employ two thermodynamic approaches, based on the equal fugacities and the equal activities, to predict the gas hydrate equilibrium dissociation conditions in the porous media. The predictions are made for the hydrate systems, CH4/H2O, C2H6/H2O, C3H8/H2O, CO2/H2O, CH4/CO2/H2O, C3H8/CH4/C2H6/H2O, and CH4/CH3OH/H2O. For the non-hydrate phase, we used the Trebble–Bishnoi equation in the fugacity approach and the Soave–Redlich–Kwong equation in the activity approach. For the hydrate phase, the van der Waals–Platteeuw model incorporated with the capillary model of Llamedo et al. [M. Llamedo, R. Anderson, B. Tohidi, Am. Mineral. 89 (2004) 1264–1270] was used in the two approaches. The predictions are found to be in satisfactory to good agreement with the experimental data. The predictive ability of the fugacity approach is better than that of the activity approach.
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