Stability of liquid CO2 in seawater at high pressures



The stability of liquid CO2, in seawater at 3°C under high pressures were investigated by observing the pH and temperature changes around liquid CO2 as well as its state. There was no distinct change of the state of liquid CO2 at 37 MPa, while the liquid CO2 at 32 MPa was unstable. Our experimental investigations suggest that a huge amount of liquid CO2 can be sequestered for a very long time with reducing CO2 dissolution and its impacts on ecosystems, if we dispose liquid CO2 at the depth greater than 3700 m in an ocean.