The phase equilibrium conditions of simulated flue gas
(12.6 vol% CO2, 80.5 vol% N2, 6.9 vol% O2) in the presence of deionized
water and the aqueous solutions of TBAB or TBPO at (5 and
26) wt% were measured in the temperature range of (275.97 to
293.99) K and pressure range (1.56 to 18.78) MPa. It was found
that addition of TBAB or TBPO allowed the dissociation conditions
of flue gas hydrate to shift to higher temperatures and lower pressures.
The semi-clathrate hydrates of TBPO + flue gas are generally
more stable thermodynamically than that of TBAB + flue gas. At a
given temperature, the equilibrium pressures of the semi-clathrate
hydrates decreased noticeably with increasing initial TBAB loading
from (5 to 26) wt%, but only minor changes were seen with the corresponding
increase in initial TBPO loading. At 5 wt%, TBPO performed
better than TBAB in reducing the equilibrium pressure
over the entire temperature range under study. At 26 wt%, TBPO
outperformed TBAB in reducing the equilibrium pressure at temperature
above 287 K.