Equilibrium
hydrate dissociation conditions (vapor + hydrate +
liquid water + liquid HCFC141b or cyclopentane) formed from CO2 + water + HCFC141b or cyclopentane are determined using an
isochoric method in this work. HCFC141b and cyclopentane are reported
to form the structure II hydrates. Phase equilibrium pressures of
the experimental systems of CO2 + water + HCFC141b or cyclopentane
are all lower than that of CO2 + H2O at any
given temperatures. The presence of HCFC141b has more effect on lowering
CO2 hydrate equilibrium pressures at lower temperatures
than that of cyclopentane, but HCFC141b and cyclopentane have the
similar effect on CO2 hydrate equilibrium pressures at
higher temperatures.
Hydrate equilibrium conditions (vapor + hydrate + liquid water + liquid tetrahydrofuran, THF) formed from carbon dioxide in aqueous solutions of THF is determined using a stepwise heating method under isochoric conditions in this work. THF is reported to form an SII hydrate. Hydrate phase equilibrium conditions are measured under the conditions of the THF mass concentration range of 0.0726−0.2503 and pressure range of 0.10−1.87 MPa. The experimental results present that the equilibrium pressures of the experimental systems of carbon dioxide + THF + H 2 O are obviously lower than that of the carbon dioxide + H 2 O system under test conditions. Furthermore, the experimental results also indicate that the carbon dioxide hydrate formation pressure decreased more apparently with more additives of THF.
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