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10/11/2008
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Professor Carl Ross, Emeritus professor of mechanical and design engineering at the University of Portsmouth believes that once CO2 has been captured from power plants or whatever, it could be safely dumped in the deep ocean by forming it into dry ice torpedoes and dumping them over the sides of ships.
He says that, “As the density of frozen CO2 is 1.56 times that of water, the frozen CO2 will sink”.
Once it reaches depth, it is likely to react with water to form carbon dioxide hydrates. At 5 deg C, these are stable under pressures above 2676 kPa, which is reached at a water depth of 252m.
Professor Ross says, “Some of the frozen CO2 will evaporate on the journey, but the bulk of it will remain frozen”.
Alternatively, one might turn the carbon dioxide into hydrate on land, and dump torpedoes of carbon dioxide hydrate, if it turned out that too much of the carbon dioxide was dissolving in the sea water and acidifying rather than all form into hydrate. Carbon dioxide hydrate has a specific gravity of about 1.1, making it more dense than sea water but not by such a large margin as CO2.
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Author
Tom Shelley
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