Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Hydrate-based separation of the CO2 + H2 mixtures. Phase equilibria with isopropanol aqueous solutions and hydrogen solubility in CO2 hydrate. / Skiba, Sergey; Chashchin, Denis; Semenov, Anton и др.
в: International Journal of Hydrogen Energy, Том 46, № 65, 21.09.2021, стр. 32904-32913.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Hydrate-based separation of the CO2 + H2 mixtures. Phase equilibria with isopropanol aqueous solutions and hydrogen solubility in CO2 hydrate
AU - Skiba, Sergey
AU - Chashchin, Denis
AU - Semenov, Anton
AU - Yarakhmedov, Murtazali
AU - Vinokurov, Vladimir
AU - Sagidullin, Aleksey
AU - Manakov, Andrey
AU - Stoporev, Andrey
N1 - Funding Information: This work was supported by the Russian Science Foundation (grant 20-79-00178 ). Publisher Copyright: © 2021 Hydrogen Energy Publications LLC
PY - 2021/9/21
Y1 - 2021/9/21
N2 - The gas hydrates' ability to preferentially bind one of the components of a gas mixture into a hydrate state makes it possible to consider hydrate-based technology as promising for the separation of gas mixtures. When a hydrate is obtained from a gas mixture, mixed hydrates with a complex composition inevitably occur. Issue of their composition determination stays apart. This a rather difficult task, which is complicated by the dissolution of small molecules such as hydrogen in the hydrate phase. This, in turn, impedes the analysis of the data obtained. In this work, the solubility of hydrogen in carbon dioxide hydrate in the range of 269.7–275.7 K and at partial H2 pressure up to 4.5 MPa was experimentally determined. Hydrate composition was found to be CO2·(0.01X)H2·6.5H2O at H2 pressure of X MPa. The equilibrium conditions of hydrates formation in the systems of H2O – CO2 – H2 and H2O – 2-propanol – CO2 – H2 were also determined in a wide range of hydrogen concentrations. Hydrogen seems to be an indifferent diluent gas regarding CO2 hydrate equilibrium pressure. The compositions of the equilibrium phases have been determined as well. It was shown that isopropanol does not form a double hydrate with СО2, only sI СО2 hydrate occurred in the studied systems. The obtained dependencies will be useful in analyzing the process of СО2 + Н2 gas mixtures separation by the hydrate-based method.
AB - The gas hydrates' ability to preferentially bind one of the components of a gas mixture into a hydrate state makes it possible to consider hydrate-based technology as promising for the separation of gas mixtures. When a hydrate is obtained from a gas mixture, mixed hydrates with a complex composition inevitably occur. Issue of their composition determination stays apart. This a rather difficult task, which is complicated by the dissolution of small molecules such as hydrogen in the hydrate phase. This, in turn, impedes the analysis of the data obtained. In this work, the solubility of hydrogen in carbon dioxide hydrate in the range of 269.7–275.7 K and at partial H2 pressure up to 4.5 MPa was experimentally determined. Hydrate composition was found to be CO2·(0.01X)H2·6.5H2O at H2 pressure of X MPa. The equilibrium conditions of hydrates formation in the systems of H2O – CO2 – H2 and H2O – 2-propanol – CO2 – H2 were also determined in a wide range of hydrogen concentrations. Hydrogen seems to be an indifferent diluent gas regarding CO2 hydrate equilibrium pressure. The compositions of the equilibrium phases have been determined as well. It was shown that isopropanol does not form a double hydrate with СО2, only sI СО2 hydrate occurred in the studied systems. The obtained dependencies will be useful in analyzing the process of СО2 + Н2 gas mixtures separation by the hydrate-based method.
KW - Gas hydrates
KW - Hydrogen
KW - Isopropanol
KW - Phase equilibria
KW - Solubility
KW - Thermodynamic hydrate inhibitor
UR - http://www.scopus.com/inward/record.url?scp=85112411096&partnerID=8YFLogxK
U2 - 10.1016/j.ijhydene.2021.07.112
DO - 10.1016/j.ijhydene.2021.07.112
M3 - Article
AN - SCOPUS:85112411096
VL - 46
SP - 32904
EP - 32913
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
SN - 0360-3199
IS - 65
ER -
ID: 34108235