Hydrate-based separation of the CO2 + H2 mixtures. Phase equilibria with isopropanol aqueous solutions and hydrogen solubility in CO2 hydrate

Hydrate-based separation of the CO2 + H2 mixtures. Phase equilibria with isopropanol aqueous solutions and hydrogen solubility in CO2 hydrate Научная публикация

Журнал

International Journal of Hydrogen Energy
ISSN: 0360-3199 , E-ISSN: 1879-3487

Вых. Данные

Год: 2021, Том: 46, Номер: 65, Страницы: 32904-32913 Страниц : 10 DOI: 10.1016/j.ijhydene.2021.07.112

Авторы

Skiba Sergey ^1,2 , Chashchin Denis ^1,2 , Semenov Anton ³ , Yarakhmedov Murtazali ³ , Vinokurov Vladimir ³ , Sagidullin Aleksey ¹ , Manakov Andrey ^1,2 , Stoporev Andrey ^1,3

Организации

1	Nikolaev Institute of Inorganic Chemistry SB RAS, Ac. Lavrentiev Ave. 3, 630090, Novosibirsk, Russian Federation
2	Novosibirsk State University, Pirogova Street 1, 630090, Novosibirsk, Russian Federation
3	Gubkin University, Department of Physical and Colloid Chemistry, 65, Leninsky Prospekt, Building 1, 119991, Moscow, Russian Federation

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.

Skiba S. , Chashchin D. , Semenov A. , Yarakhmedov M. , Vinokurov V. , Sagidullin A. , Manakov A. , Stoporev A.
Hydrate-based separation of the CO2 + H2 mixtures. Phase equilibria with isopropanol aqueous solutions and hydrogen solubility in CO2 hydrate
International Journal of Hydrogen Energy. 2021. V.46. N65. P.32904-32913. DOI: 10.1016/j.ijhydene.2021.07.112 WOS OpenAlex

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