Abstract
Carbon dioxide sequestration at intermediate ocean depths in the form of a sinking CO2 stream has been shown to be technically feasible. Buoyancy characteristics of CO2 hydrate particles obtained from a coflow reactor operating under conditions that produce negatively buoyant CO2 hydrate composite particles were studied. Using a simplified process model, the limiting ratios of CO 2 to water to produce sinking hydrate composite streams were established for pressure and temperature conditions of intermediate ocean depths. A kinetic model involving a mass transfer step and a reaction step was proposed to explain experimental data using a seafloor process simulator. Results suggest that the reactor operates under mass-transfer controlled conditions. Although the density of freshwater is only a few percentage units less than that of seawater, operating conditions derived from freshwater-based studies are significantly different for ambient seawater. Owing to the higher density of seawater, greater conversion of CO2 to hydrate is needed to obtain a sinking CO2 composite stream than at the same depth of freshwater.
Original language | English |
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Pages (from-to) | 703-712 |
Number of pages | 10 |
Journal | Journal of Dispersion Science and Technology |
Volume | 25 |
Issue number | 5 |
DOIs | |
State | Published - Sep 2004 |
Keywords
- CO hydrate
- Mass transfer
- Ocean carbon sequestration