Pages 309-310
Ocean sequestration of carbon dioxide (CO_2) has been expected to be one of technologies for mitigation of the global warming. Injection experiments of liquid CO_2 at 30MPa in a high-pressure tank were carried out to estimate the influence of the ocean sequestration on deep sea environment. The terminal velocity of CO_2 drops sinking in highly pressured water was analyzed by assuming that of rigid spheres with same density to liquid CO_2. The formation rate of CO_2 hydrate film on the surface of CO_2 drops was increased by subcooling. The storage of CO_2 drops on the bottom of the tank for two days provided a pH change of 1.4,and the following stirring of ambient water caused a further pH change of 1.4. These results suggest the dissolution rate of CO_2 into ambient water would be significantly affected by ambient water flow.
