抄録
Injection of liquid CO2 in hydrate layers of natural gas is a promising technique to recover methane simultaneously segregating CO2 from the biosphere. This work examined the rate of the conversion of CH4-hydrate immersed in liquid CO2 to CO2-hydrate in a temperature range of 274-281 K and a pressure range of 4-10 MPa. About 17% of the methane, utilizing CO2, was recovered after 300 hours at 10 MPa and 281 K, and the conversion was on going even at the end of every experiment. The solute mobility rose as the temperature increased; it decreased as the total pressure increased. The solute mobility of methane and CO2 in hydrate solid was determined for future feasibility studies. The configuration of the system should be investigated in a feasibility study, including the recovery system for CH4.
