Effects of Salinity on Formation Behavior of Methane Hydrate in Montmorillonite
In marine sediments, seawater influences the phase behavior of natural gas hydrate. As a porous medium, the water distribution and physical properties of montmorillonite are influenced by the salt ions in seawater. In this work, the bound-water content in, and crystal structure of, montmorillonite i...
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ftmdpi:oai:mdpi.com:/1996-1073/13/1/231/ 2023-08-20T04:07:56+02:00 Effects of Salinity on Formation Behavior of Methane Hydrate in Montmorillonite Yuanqing Tao Kefeng Yan Xiaosen Li Zhaoyang Chen Yisong Yu Chungang Xu 2020-01-02 application/pdf https://doi.org/10.3390/en13010231 EN eng Multidisciplinary Digital Publishing Institute https://dx.doi.org/10.3390/en13010231 https://creativecommons.org/licenses/by/4.0/ Energies; Volume 13; Issue 1; Pages: 231 natural gas hydrate montmorillonite salt ions bound water Text 2020 ftmdpi https://doi.org/10.3390/en13010231 2023-07-31T22:57:41Z In marine sediments, seawater influences the phase behavior of natural gas hydrate. As a porous medium, the water distribution and physical properties of montmorillonite are influenced by the salt ions in seawater. In this work, the bound-water content in, and crystal structure of, montmorillonite is measured to investigate the effect of salt ions on the water distribution in montmorillonite. It can be determined from the results that the bound-water content in montmorillonite decreases as the salt-ion concentration increases. Salt ions affect the intercalation of water molecules in montmorillonite, and they then inhibit the expansion effect of montmorillonite. Next, the phase behaviors of methane hydrate in montmorillonite with NaCl solution are investigated using high-pressure micro-differential scanning calorimetry. The phase behavior of hydrate in montmorillonite with NaCl solution is discussed. In montmorillonite with NaCl solution, the phase equilibrium temperatures and the conversion rate of methane hydrate both decrease with increasing NaCl concentration. The results show that methane hydrate in montmorillonite is influenced not only by the phase-equilibrium effect of salt ions, but also by the formation effect of the salt ions on the bound-water content in montmorillonite. Text Methane hydrate MDPI Open Access Publishing Energies 13 1 231 |
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natural gas hydrate montmorillonite salt ions bound water |
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natural gas hydrate montmorillonite salt ions bound water Yuanqing Tao Kefeng Yan Xiaosen Li Zhaoyang Chen Yisong Yu Chungang Xu Effects of Salinity on Formation Behavior of Methane Hydrate in Montmorillonite |
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natural gas hydrate montmorillonite salt ions bound water |
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In marine sediments, seawater influences the phase behavior of natural gas hydrate. As a porous medium, the water distribution and physical properties of montmorillonite are influenced by the salt ions in seawater. In this work, the bound-water content in, and crystal structure of, montmorillonite is measured to investigate the effect of salt ions on the water distribution in montmorillonite. It can be determined from the results that the bound-water content in montmorillonite decreases as the salt-ion concentration increases. Salt ions affect the intercalation of water molecules in montmorillonite, and they then inhibit the expansion effect of montmorillonite. Next, the phase behaviors of methane hydrate in montmorillonite with NaCl solution are investigated using high-pressure micro-differential scanning calorimetry. The phase behavior of hydrate in montmorillonite with NaCl solution is discussed. In montmorillonite with NaCl solution, the phase equilibrium temperatures and the conversion rate of methane hydrate both decrease with increasing NaCl concentration. The results show that methane hydrate in montmorillonite is influenced not only by the phase-equilibrium effect of salt ions, but also by the formation effect of the salt ions on the bound-water content in montmorillonite. |
format |
Text |
author |
Yuanqing Tao Kefeng Yan Xiaosen Li Zhaoyang Chen Yisong Yu Chungang Xu |
author_facet |
Yuanqing Tao Kefeng Yan Xiaosen Li Zhaoyang Chen Yisong Yu Chungang Xu |
author_sort |
Yuanqing Tao |
title |
Effects of Salinity on Formation Behavior of Methane Hydrate in Montmorillonite |
title_short |
Effects of Salinity on Formation Behavior of Methane Hydrate in Montmorillonite |
title_full |
Effects of Salinity on Formation Behavior of Methane Hydrate in Montmorillonite |
title_fullStr |
Effects of Salinity on Formation Behavior of Methane Hydrate in Montmorillonite |
title_full_unstemmed |
Effects of Salinity on Formation Behavior of Methane Hydrate in Montmorillonite |
title_sort |
effects of salinity on formation behavior of methane hydrate in montmorillonite |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2020 |
url |
https://doi.org/10.3390/en13010231 |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_source |
Energies; Volume 13; Issue 1; Pages: 231 |
op_relation |
https://dx.doi.org/10.3390/en13010231 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/en13010231 |
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Energies |
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13 |
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231 |
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1774719928146853888 |