BASIC EXPERIMENTAL RESULTS OF LIQUID CO2 INJECTION INTO THE DEEP-OCEAN

CO2 disposal in the deep ocean is expected to be an effective option f or mitigating the increase in CO2 on the earth. We have investigated t he behaviour of liquid CO2 using test facilities which can simulate th e pressure and temperature of the deep ocean. Phase equilibrium data o f the CO2-seawater system and the conditions of CO2 clathrate formatio n were confirmed. In addition, we measured the pH value of seawater sa turated with CO2 at high pressure. The data presented in this paper ar e considered indispensable for evaluating the possibility of CO2 dispo sal in the deep ocean.