Phase Equilibria and Thermodynamic Modeling of Ethane and Propane Hydrates in Porous Silica Gels

In the present study, we examined the active role of porous silica gels when used as natural gas storage and transportation media. We adopted the dispersed water in silica gel pores to substantially enhance active surface for contacting and encaging gas molecules. We measured the three-phase hydrate (H)-water-rich liquid (L-W)-vapor (V) equilibria of C2H6 and C3H8 hydrates in 6.0, 15.0, 30.0, and 100.0 nm silica gel pores to investigate the effect of geometrical constraints on gas hydrate phase equilibria. At specified temperatures, the hydrate stability region is shifted to a higher pressure region depending on pore size when compared with those of bulk hydrates. Through application of the Gibbs-Thomson relationship to the experimental data, we determined the values for the C2H6 hydrate-water and C3H8 hydrate-water interfacial tensions to be 39 +/- 2 and 45 +/- 1 mJ/m(2), respectively. By using these values, the calculation values were in good agreement with the experimental ones. The overall results given in this study could also be quite useful in various fields, such as exploitation of natural gas hydrate in marine sediments and sequestration of carbon dioxide into the deep ocean.
Publisher
AMER CHEMICAL SOC
Issue Date
2009-04
Language
ENG
Keywords

PORE-SIZE DISTRIBUTIONS; CLATHRATE HYDRATE; CARBON-DIOXIDE; METHANE HYDRATE; DISSOCIATION; MEDIA; TEMPERATURES; PRESSURES; MIXTURES; BEHAVIOR

Citation

JOURNAL OF PHYSICAL CHEMISTRY B, v.113, no.16, pp.5487 - 5492

ISSN
1520-6106
DOI
10.1021/jp810453t
URI
http://hdl.handle.net/10203/8886
Appears in Collection
CBE-Journal Papers(저널논문)
  • Hit : 362
  • Download : 1
  • Cited 0 times in thomson ci
This item is cited by other documents in WoS
⊙ Detail Information in WoSⓡClick to seewebofscience_button
⊙ Cited 33 items in WoSClick to see citing articles inrecords_button

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0