Phase Equilibrium Conditions
for Clathrate Hydrates
of Tetra-<i>n</i>-butylammonium Bromide (TBAB) and Xenon
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Abstract
Phase equilibrium pressure–temperature (<i>pT</i>) conditions for the xenon (Xe)–tetra-<i>n</i>-butylammonium
bromide (TBAB)–water system were characterized by an isochoric
method in the pressure range from (0.05 to 0.3) MPa using TBAB solutions
with mole fractions ranging from (0.0029 to 0.0137). The phase equilibrium <i>pT</i> conditions in the system appeared at a lower pressure
and higher temperature than in the pure Xe hydrate. Furthermore, under
atmospheric pressure, the dissociation temperature in the Xe–TBAB–water
system shifted to a higher region than in the pure TBAB hydrate. In
the experimental TBAB concentration range, the powder X-ray diffraction
patterns of the Xe–TBAB–water system revealed that the
TBAB clathrate hydrate is TBAB·38H<sub>2</sub>O