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Phase equilibrium for clathrate hydrate formed in methane + water + ethylene carbonate system. / Semenov, Anton P.; Medvedev, Vladimir I.; Gushchin, Pavel A. и др.
в: Fluid Phase Equilibria, Том 432, 25.01.2017, стр. 1-9.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Phase equilibrium for clathrate hydrate formed in methane + water + ethylene carbonate system
AU - Semenov, Anton P.
AU - Medvedev, Vladimir I.
AU - Gushchin, Pavel A.
AU - Kotelev, Mikhail S.
AU - Yakushev, Vladimir S.
AU - Stoporev, Andrey S.
AU - Sizikov, Artem A.
AU - Ogienko, Andrey G.
AU - Vinokurov, Vladimir A.
PY - 2017/1/25
Y1 - 2017/1/25
N2 - Three-phase equilibrium conditions Lw-V-H (liquid water solution-vapor-hydrate) for methane hydrate in the presence of ethylene carbonate (C3H4O3) as additive in aqueous solutions have been determined experimentally by isochoric method. New experimental results are reported for pressures ranging from 4 to 22 MPa and for mass fraction of ethylene carbonate ranging from 0.05 to 0.24 (0.011–0.061 for mole fraction). The experimental results show that the addition of ethylene carbonate to the system shifts hydrate phase equilibrium to higher pressure and lower temperature. With the concentration of 0.240 mass fraction of ethylene carbonate additive in an aqueous system, the most significant decrease of the equilibrium temperature is about 3 K at a given pressure, in comparison to that of methane + water system without additive. The effect of ethylene carbonate on methane hydrate formation conditions was compared with that of cyclopentanone (C5H8O) and γ-butyrolactone (C4H6O2), which have similar molecular structures. The following phenomenon has been revealed: increase of the number of oxygen atoms in a molecule of this row shifts the hydrate phase boundary to inhibition region. Powder X-Ray diffraction (PXRD) results show that clathrate hydrate with sI structure formed in presence of ethylene carbonate within investigated range of concentration is pure phase of methane hydrate without inclusion of additive. It was also observed that there were some unknown peaks, which were not the same with peaks of pure ethylene carbonate. We speculate that they correspond to a solvate of ethylene carbonate with water.
AB - Three-phase equilibrium conditions Lw-V-H (liquid water solution-vapor-hydrate) for methane hydrate in the presence of ethylene carbonate (C3H4O3) as additive in aqueous solutions have been determined experimentally by isochoric method. New experimental results are reported for pressures ranging from 4 to 22 MPa and for mass fraction of ethylene carbonate ranging from 0.05 to 0.24 (0.011–0.061 for mole fraction). The experimental results show that the addition of ethylene carbonate to the system shifts hydrate phase equilibrium to higher pressure and lower temperature. With the concentration of 0.240 mass fraction of ethylene carbonate additive in an aqueous system, the most significant decrease of the equilibrium temperature is about 3 K at a given pressure, in comparison to that of methane + water system without additive. The effect of ethylene carbonate on methane hydrate formation conditions was compared with that of cyclopentanone (C5H8O) and γ-butyrolactone (C4H6O2), which have similar molecular structures. The following phenomenon has been revealed: increase of the number of oxygen atoms in a molecule of this row shifts the hydrate phase boundary to inhibition region. Powder X-Ray diffraction (PXRD) results show that clathrate hydrate with sI structure formed in presence of ethylene carbonate within investigated range of concentration is pure phase of methane hydrate without inclusion of additive. It was also observed that there were some unknown peaks, which were not the same with peaks of pure ethylene carbonate. We speculate that they correspond to a solvate of ethylene carbonate with water.
KW - Ethylene carbonate
KW - Gas hydrates
KW - Isochoric method
KW - Methane
KW - Phase equilibrium
KW - PXRD
KW - STORAGE
KW - 1,4-DIOXANE
KW - NATURAL-GAS
KW - MIXTURES
KW - HYDROGEN
KW - STRUCTURE-H
KW - STRUCTURE-II
KW - NITROGEN
KW - INHIBITORS
KW - SELF-PRESERVATION
UR - http://www.scopus.com/inward/record.url?scp=84992395883&partnerID=8YFLogxK
U2 - 10.1016/j.fluid.2016.10.015
DO - 10.1016/j.fluid.2016.10.015
M3 - Article
AN - SCOPUS:84992395883
VL - 432
SP - 1
EP - 9
JO - Fluid Phase Equilibria
JF - Fluid Phase Equilibria
SN - 0378-3812
ER -
ID: 10320195