Formation kinetics and phase equilibrium of CO2 hydrates under marine sediment environment for offshore CO2 sequestration

<p>Daeseung Kyung</p>

Formation kinetics and phase equilibrium of CO2 hydrates under marine sediment environment for offshore CO2 sequestration

Daeseung Kyung

Land and Housing Institute, South Korea

: Expert Opin Environ Biol

Abstract

Gas hydrates are nonstoichiometric crystalline guest-host structures in which gas molecules (e.g., CO2, CH4, and N2O) are trapped inside hydrogen-bonded water cages under high pressure and low temperature environment. Massive amount of CO2 (150~180 m3) could be entrapped in 1 m3 of CO2 hydrate structure. Moreover, formation of CO2 hydrates in marine sediments during offshore CO2 storage could prevent buoyant CO2 leakage due to the formation of a hydrate cap. Understanding of formation kinetics and phase equilibrium of CO2 hydrates is significant because they are directly related to CO2 trapping speed in hydrate structure and stability of stored CO2, respectively. Therefore, in this study, we investigated the formation kinetics and phase equilibrium of CO2 hydrate under the marine environmental conditions for potential application of CO2 hydrates for offshore CO2 sequestration.