Why does CO2 hydrate disposed of in the ocean in the hydrate-formation region dissolve in seawater?

Cited 31 time in webofscience Cited 0 time in scopus
  • Hit : 252
  • Download : 0
The fate of CO2 hydrate disposed of in the ocean is analyzed based on thermodynamic theory. It is found that CO2 hydrate and seawater form a stable system only when (a) the system pressure p and temperature T fall within the hydrate-formation region in the ocean (i.e. p > 4.5 MPa and T < 283 K) and (b) seawater is saturated or supersaturated with respect to CO2. At ocean depths below 440 m, the pressure and temperature required for system stability are satisfied. However, since seawater is highly unsaturated with respect to CO2, the requirement for full thermodynamic stability cannot be met because the hydrate and seawater are not in chemical equilibrium and the chemical potential for CO2 in the hydrate is larger than that in seawater. Therefore, the hydrate is unstable and dissolves in seawater. Thus, CO2 hydrate disposed of in the ocean may not be a long-lived entity in the ocean as was predicted previously by many investigators. The results of our study have been confirmed by laboratory simulations. (C) 1997 Elsevier Science Ltd.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
1997-12
Language
English
Article Type
Article
Keywords

LOW-TEMPERATURE WATER; SIMULATED DEEP-OCEAN; CARBON-DIOXIDE; CLATHRATE FORMATION; HIGH-PRESSURE; DEPOSITION; SURFACE; DROPLET; FORM; FATE

Citation

ENERGY, v.22, no.12, pp.1111 - 1117

ISSN
0360-5442
URI
http://hdl.handle.net/10203/75286
Appears in Collection
CBE-Journal Papers(저널논문)
Files in This Item
There are no files associated with this item.
This item is cited by other documents in WoS
⊙ Detail Information in WoSⓡ Click to see webofscience_button
⊙ Cited 31 items in WoS Click to see citing articles in records_button

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0