Influence of Gas Supply Changes on the Formation Process of Complex Mixed Gas Hydrates
Natural gas hydrate occurrences contain predominantly methane; however, there are increasing reports of complex mixed gas hydrates and coexisting hydrate phases. Changes in the feed gas composition due to the preferred incorporation of certain components into the hydrate phase and an inadequate gas...
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2021
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ftdoajarticles:oai:doaj.org/article:96bbdbaf668a470987847a2c89a3a8c4 2023-05-15T17:57:57+02:00 Influence of Gas Supply Changes on the Formation Process of Complex Mixed Gas Hydrates Mengdi Pan Judith M. Schicks 2021-05-01T00:00:00Z https://doi.org/10.3390/molecules26103039 https://doaj.org/article/96bbdbaf668a470987847a2c89a3a8c4 EN eng MDPI AG https://www.mdpi.com/1420-3049/26/10/3039 https://doaj.org/toc/1420-3049 doi:10.3390/molecules26103039 1420-3049 https://doaj.org/article/96bbdbaf668a470987847a2c89a3a8c4 Molecules, Vol 26, Iss 3039, p 3039 (2021) mixed gas hydrates hydrate formation process coexisting phases in situ Raman spectroscopy gas supply conditions Organic chemistry QD241-441 article 2021 ftdoajarticles https://doi.org/10.3390/molecules26103039 2022-12-31T05:28:58Z Natural gas hydrate occurrences contain predominantly methane; however, there are increasing reports of complex mixed gas hydrates and coexisting hydrate phases. Changes in the feed gas composition due to the preferred incorporation of certain components into the hydrate phase and an inadequate gas supply is often assumed to be the cause of coexisting hydrate phases. This could also be the case for the gas hydrate system in Qilian Mountain permafrost (QMP), which is mainly controlled by pores and fractures with complex gas compositions. This study is dedicated to the experimental investigations on the formation process of mixed gas hydrates based on the reservoir conditions in QMP. Hydrates were synthesized from water and a gas mixture under different gas supply conditions to study the effects on the hydrate formation process. In situ Raman spectroscopic measurements and microscopic observations were applied to record changes in both gas and hydrate phase over the whole formation process. The results demonstrated the effects of gas flow on the composition of the resulting hydrate phase, indicating a competitive enclathration of guest molecules into the hydrate lattice depending on their properties. Another observation was that despite significant changes in the gas composition, no coexisting hydrate phases were formed. Article in Journal/Newspaper permafrost Directory of Open Access Journals: DOAJ Articles Molecules 26 10 3039 |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
mixed gas hydrates hydrate formation process coexisting phases in situ Raman spectroscopy gas supply conditions Organic chemistry QD241-441 |
spellingShingle |
mixed gas hydrates hydrate formation process coexisting phases in situ Raman spectroscopy gas supply conditions Organic chemistry QD241-441 Mengdi Pan Judith M. Schicks Influence of Gas Supply Changes on the Formation Process of Complex Mixed Gas Hydrates |
topic_facet |
mixed gas hydrates hydrate formation process coexisting phases in situ Raman spectroscopy gas supply conditions Organic chemistry QD241-441 |
description |
Natural gas hydrate occurrences contain predominantly methane; however, there are increasing reports of complex mixed gas hydrates and coexisting hydrate phases. Changes in the feed gas composition due to the preferred incorporation of certain components into the hydrate phase and an inadequate gas supply is often assumed to be the cause of coexisting hydrate phases. This could also be the case for the gas hydrate system in Qilian Mountain permafrost (QMP), which is mainly controlled by pores and fractures with complex gas compositions. This study is dedicated to the experimental investigations on the formation process of mixed gas hydrates based on the reservoir conditions in QMP. Hydrates were synthesized from water and a gas mixture under different gas supply conditions to study the effects on the hydrate formation process. In situ Raman spectroscopic measurements and microscopic observations were applied to record changes in both gas and hydrate phase over the whole formation process. The results demonstrated the effects of gas flow on the composition of the resulting hydrate phase, indicating a competitive enclathration of guest molecules into the hydrate lattice depending on their properties. Another observation was that despite significant changes in the gas composition, no coexisting hydrate phases were formed. |
format |
Article in Journal/Newspaper |
author |
Mengdi Pan Judith M. Schicks |
author_facet |
Mengdi Pan Judith M. Schicks |
author_sort |
Mengdi Pan |
title |
Influence of Gas Supply Changes on the Formation Process of Complex Mixed Gas Hydrates |
title_short |
Influence of Gas Supply Changes on the Formation Process of Complex Mixed Gas Hydrates |
title_full |
Influence of Gas Supply Changes on the Formation Process of Complex Mixed Gas Hydrates |
title_fullStr |
Influence of Gas Supply Changes on the Formation Process of Complex Mixed Gas Hydrates |
title_full_unstemmed |
Influence of Gas Supply Changes on the Formation Process of Complex Mixed Gas Hydrates |
title_sort |
influence of gas supply changes on the formation process of complex mixed gas hydrates |
publisher |
MDPI AG |
publishDate |
2021 |
url |
https://doi.org/10.3390/molecules26103039 https://doaj.org/article/96bbdbaf668a470987847a2c89a3a8c4 |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
Molecules, Vol 26, Iss 3039, p 3039 (2021) |
op_relation |
https://www.mdpi.com/1420-3049/26/10/3039 https://doaj.org/toc/1420-3049 doi:10.3390/molecules26103039 1420-3049 https://doaj.org/article/96bbdbaf668a470987847a2c89a3a8c4 |
op_doi |
https://doi.org/10.3390/molecules26103039 |
container_title |
Molecules |
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26 |
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10 |
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3039 |
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1766166461588439040 |