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Growth-controlling processes of CO2gas hydrates
-
S. Hirai
und
H. Sanda
Veröffentlicht/Copyright:
28. März 2015
Abstract
During dissolution of liquid or gaseous CO2 into the ocean, a potential process for CO2 ocean sequestration to offset global warming, a hydrate film forms at the CO2-water interface and limits the CO2 dissolution rate. By experimentally studying the conditions under which such a CO2 gas hydrate film maintains a constant thickness, we determined the processes that control CO2 hydrate growth rates. A constant film thickness cannot be maintained when the decomposition rate exceeds a certain critical value. The decomposition rate was varied by adjusting the flow velocity of a water stream directed perpendicular to the hydrate film. An increase of the flow speed increased the decomposition rate, which decreased the steady-state film thickness. However, at a critical value, net decomposition occurs and the hydrate film completely dissolves. The critical decomposition rates are roughly proportional to pressure and relatively independent of temperature from 274.6 to 278.7 K. The transport of H2O through the hydrate layer to the growth sites near the CO2-hydrate interface controls the growth rate when it is relatively small, but the supply of CO2 molecules limits it at relatively high growth rates.
Received: 2003-11-7
Accepted: 2004-4-21
Published Online: 2015-3-28
Published in Print: 2004-8-1
© 2015 by Walter de Gruyter Berlin/Boston
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Artikel in diesem Heft
- Introductory overview: Hydrate knowledge development
- Scanning Electron Microscopy investigations of laboratory-grown gas clathrate hydrates formed from melting ice, and comparison to natural hydrates
- Dynamics of trimethylene oxide in a structure II clathrate hydrate
- The stability of methane hydrates in highly concentrated electrolyte solutions by differential scanning calorimetry and theoretical computation
- The effect of elevated methane pressure on methane hydrate dissociation
- Methane hydrate formation in partially water-saturated Ottawa sand
- Methanol—inhibitor or promoter of the formation of gas hydrates from deuterated ice?
- Investigating the performance of clathrate hydrate inhibitors using in situ Raman spectroscopy and differential scanning calorimetry
- Physical properties and rock physics models of sediment containing natural and laboratory-formed methane gas hydrate
- Experimental studies on the formation of porous gas hydrates
- Investigation of jet breakup and droplet size distribution of liquid CO2and water systems—implications for CO2hydrate formation for ocean carbon sequestration
- Measurement of clathrate hydrate precipitation from CO2solution by a nondestructive method
- Influence of water thermal history and overpressure on CO2-hydrate nucleation and morphology
- Growth-controlling processes of CO2gas hydrates
- Thermodynamic prediction of clathrate hydrate dissociation conditions in mesoporous media
- Modeling dynamic marine gas hydrate systems
- Late-stage, high-temperature processesing in the Allende meteorite: Record from Ca,Fe-rich silicate rims around dark inclusions
- Partitioning of Sr, Ba, Rb, Y, and LREE between alkali feldspar and peraluminous silicic magma
- Nondestructive three-dimensional element-concentration mapping of a Cs-doped partially molten granite by X-ray computed tomography using synchrotron radiation
- A theoretical study of structural factors correlated with 23Na NMR parameters
- Metamorphic formation of Sr-apatite and Sr-bearing monazite in a high-pressure rock from the Bohemian Massif
- Ultra-deep origin of garnet peridotite from the North Qaidam ultrahigh-pressure belt, Northern Tibetan Plateau, NW China
- Letter. Novel high-pressure behavior in chlorite: A synchrotron XRD study of clinochlore to 27 GPa
- Letter. Periodic precipitation pattern formation in hydrothermally treated metamict zircon
- A high pressure X-ray diffraction study of aragonite and the post-aragonite phase transition in CaCO3
