Continuous separation of CO2 from H2 + CO2 gas mixture utilizing clathrate hydrate for integrated gasification combined cycle power plants

In this study, the CO
₂
continuous separation experiments were performed in the system of H
₂
+ CO
₂
+ H
₂
O and H
₂
+ CO
₂
+ tetra-n-butylammonium bromide (TBAB) + H
₂
O for TBAB mass fraction, w
_TBAB
of 0 (the water system), 0.05, 0.10, 0.32. The time evolutions of compositions in the gas phase and the hydrate slurry were measured. The H
₂
compositions in the gas phase for w
_TBAB
of 0, 0.05, and 0.10 reached steady state at 0.87, 0.81, and 0.78 while the CO
₂
compositions in the hydrate slurry were 1.00, 0.82, 0.79, respectively. It is shown that the experiments succeed in continuously separating CO
₂
with structure I hydrate and ionic semiclathrate hydrate. On the other hand, the hydrate transportation problem in separation process occurred for w
_TBAB
= 0.32. For w
_TBAB
= 0, the highest values of H
₂
compositions in the gas phase and CO
₂
compositions in hydrate slurry were obtained. The concentration of captured CO
₂
for w
_TBAB
= 0 was comparable to that obtained by multistage process in hydrate-based gas separation or chemical absorption used in the demonstration project of integrated gasification combined cycle.