Figures 3 and 4 respectively show that addition of TBAB and
TBPO considerably shifted the phase equilibrium curves to the
lower right region. Specifically, at 5 MPa, increasing TBAB concentration
from (5 to 26) wt% would increase the hydrate phase equilibrium
temperature from (283 to 288) K, that is, a 5-K shift. In
contrast, increasing TBPO concentration from (5 to 26) wt% would
see only a 1-K shift. The above observation made for flue gas
hydrates at high pressures was consistent with the observation
made at 0.1 MPa that the difference in the dissociation temperature
between 40.8 wt% TBAB (corresponding to TBAB 26H2O)
and 32 wt% TBAB (TBAB 38H2O) was relatively large (i.e. T = 5 K)
[49] whereas the difference between 30.2 wt% TBPO
(TBPO 28H2O) and 26.0 wt% TBPO (TBPO 34.5H2O) was rather
small (less than T = 1 K) [45,46]. Moreover, the measured dissociation
temperature of 5 wt% TBPO at ambient pressure was
T = 276.2 K (with uncertainty of T = 0.5 K), whereas the corresponding
temperature of 5 wt% TBAB was estimated by extrapolation
to be T = 274.8 K or lower, depending on the hydrate type [40].
Figures 3 and 4 respectively show that addition of TBAB andTBPO considerably shifted the phase equilibrium curves to thelower right region. Specifically, at 5 MPa, increasing TBAB concentrationfrom (5 to 26) wt% would increase the hydrate phase equilibriumtemperature from (283 to 288) K, that is, a 5-K shift. Incontrast, increasing TBPO concentration from (5 to 26) wt% wouldsee only a 1-K shift. The above observation made for flue gashydrates at high pressures was consistent with the observationmade at 0.1 MPa that the difference in the dissociation temperaturebetween 40.8 wt% TBAB (corresponding to TBAB 26H2O)and 32 wt% TBAB (TBAB 38H2O) was relatively large (i.e. T = 5 K)[49] whereas the difference between 30.2 wt% TBPO(TBPO 28H2O) and 26.0 wt% TBPO (TBPO 34.5H2O) was rathersmall (less than T = 1 K) [45,46]. Moreover, the measured dissociationtemperature of 5 wt% TBPO at ambient pressure wasT = 276.2 K (with uncertainty of T = 0.5 K), whereas the correspondingtemperature of 5 wt% TBAB was estimated by extrapolationto be T = 274.8 K or lower, depending on the hydrate type [40].
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