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Seo, Yongwon
Advanced Clean Energy Lab (ACE Lab)
Research Interests
  • Gas Hydrates, Greenhouse Gas, Clean Energy

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Experimental Measurement and Thermodynamic Modeling of the Mixed CH4 + C3H8 Clathrate Hydrate Equilibria in Silica Gel Pores: Effects of Pore Size and Salinity

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Title
Experimental Measurement and Thermodynamic Modeling of the Mixed CH4 + C3H8 Clathrate Hydrate Equilibria in Silica Gel Pores: Effects of Pore Size and Salinity
Author
Lee, SeungminSeo, Yongwon
Keywords
Aqueous electrolyte; Capillary effects; Clathrate hydrate; Correction terms; Cylindrical Pores; Electrolyte solutions; Experimental measurements; Gibbs-Thomson equations; Guest molecules; Interfacial tensions; NaCl concentration; Pitzer models; Pressure regions; Thermodynamic modeling; Van der waals; Water mixture
Issue Date
2010-06
Publisher
AMER CHEMICAL SOC
Citation
LANGMUIR, v.26, no.12, pp.9742 - 9748
Abstract
We measured hydrate phase equilibria for the ternary CH4 (90%)+ C3H8 (10%)+ water mixtures in silica gel pores with nominal diameters of 6.0, 15.0, 30.0, and 100.0 nm and for the quaternary CH4 (90%)+ C3H8 (10%) + NaCl + water mixtures of two different NaCl concentrations (3 and 10 wt%) in silica gel pores with nominal diameters of 6.0, 15.0, and 30.0 nm. The CH4 (90%)+ C 3H8 (10%) hydrate-water interfacial tension (σHW) of 42 ± 3mJ/m2 was obtained through the Gibbs-Thomson equation for dissociation within cylindrical pores. With this value, the experimental results were in good agreement with the calculated ones based on the van der Waals and Platteeuw model. A correction term for the capillary effect and a Pitzer model for electrolyte solutions were adopted to calculate the activity of water in the aqueous electrolyte solutionswithin silica gel pores. At a specified temperature, three-phaseH-LW- Vequilibriumcurves of pore hydrateswere shifted to higher-pressure regions depending on pore sizes and NaCl concentrations. From the cage-dependent 13CNMR chemical shifts of enclathrated guest molecules, the mixed CH4 (90%)+ C3H8 (10%) gas hydrate was confirmed to be structure II.
URI
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DOI
10.1021/la100466s
ISSN
0743-7463
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UEE_Journal Papers
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