Dissolution behavior and hydrate effect on CO2 ocean sequestration

CO2 ocean sequestration is one of the promising options to reduce CO2 concentration in the atmosphere because the ocean has vast capacity for CO2 absorption. Therefore, in the present investigation, calculations for solubility and dissolution behavior of liquid CO2 droplets released at 1000 m and 1500 m deep in the ocean from a moving ship and a fixed pipeline have been carried out in order to estimate the CO2 dissolution characteristics in the ocean. The results show liquid CO2 becomes CO2 bubble at around 500 m in depth, and the solubility of seawater is about 5% less than of pure water. Also, it is shown that the injection of liquid CO2 from a moving ship is a more effective method for dissolution than from a fixed pipeline, and the presence of hydrate on liquid CO2 acts as a resistant layer in dissolving liquid CO2.