Figure 2 shows the phase equilibrium conditions of the flue gas
hydrate in the absence of additives. Also plotted in this figure are
the phase equilibria of simple hydrates of N2, O2, and CO2, for comparison.
As shown, the equilibrium pressure increased with
increasing temperature. At a given temperature, the equilibrium
pressure of the flue gas hydrate was lower than N2 and O2 hydrates
but was higher than that of CO2 hydrate. This result is consistent