Stabilization of methane hydrate by pressurization with He or N2 Gas
The behavior of methane hydrate was investigated after it was pressurized with helium or nitrogen gas in a test system by monitoring the gas compositions. The results obtained indicate that even when the partial pressure of methane gas in such a system is lower than the equilibrium pressure at a cer...
Published in: | The Journal of Physical Chemistry B |
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Online Access: | https://doi.org/10.1021/jp076858t https://nrc-publications.canada.ca/eng/view/object/?id=ea16270b-5a3e-4a17-9ae3-21007da269d5 https://nrc-publications.canada.ca/fra/voir/objet/?id=ea16270b-5a3e-4a17-9ae3-21007da269d5 |
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ftnrccanada:oai:cisti-icist.nrc-cnrc.ca:cistinparc:12328226 2023-05-15T17:11:10+02:00 Stabilization of methane hydrate by pressurization with He or N2 Gas Lu, Hailong Tsuji, Yoshihiro Ripmeester, John A. 2007-12-07 text https://doi.org/10.1021/jp076858t https://nrc-publications.canada.ca/eng/view/object/?id=ea16270b-5a3e-4a17-9ae3-21007da269d5 https://nrc-publications.canada.ca/fra/voir/objet/?id=ea16270b-5a3e-4a17-9ae3-21007da269d5 eng eng issn:1520-6106 The Journal Of Physical Chemistry B, Volume: 111, Issue: 51, Publication date: 2007-12-07, Pages: 14163–14168 doi:10.1021/jp076858t irn:18077705 article 2007 ftnrccanada https://doi.org/10.1021/jp076858t 2021-09-01T06:30:22Z The behavior of methane hydrate was investigated after it was pressurized with helium or nitrogen gas in a test system by monitoring the gas compositions. The results obtained indicate that even when the partial pressure of methane gas in such a system is lower than the equilibrium pressure at a certain temperature, the dissociation rate of methane hydrate is greatly depressed by pressurization with helium or nitrogen gas. This phenomenon is only observed when the total pressure of methane and helium (or nitrogen) gas in the system is greater than the equilibrium pressure required to stabilize methane hydrate with just methane gas. The following model has been proposed to explain the observed phenomenon: (1) Gas bubbles develop at the hydrate surface during hydrate dissociation, and there is a pressure balance between the methane gas inside the gas bubbles and the external pressurizing gas (methane and helium or nitrogen), as transmitted through the water film; as a result the methane gas in the gas bubbles stabilizes the hydrate surface covered with bubbles when the total gas pressure is greater than the equilibrium pressure of the methane hydrate at that temperature; this situation persists until the gas in the bubbles becomes sufficiently dilute in methane or until the surface becomes bubble-free. (2) In case of direct contact of methane hydrate with water, the water surrounding the hydrate is supersaturated with methane released upon hydrate dissociation; consequently, methane hydrate is stabilized when the hydrostatic pressure is above the equilibrium pressure of methane hydrate at a certain temperature, again until the dissolved gas at the surface becomes sufficiently dilute in methane. In essence, the phenomenon is due to the presence of a nonequilibrium state where there is a chemical potential gradient from the solid hydrate particles to the bulk solution that exists as long as solid hydrate remains. Peer reviewed: Yes NRC publication: Yes Article in Journal/Newspaper Methane hydrate National Research Council Canada: NRC Publications Archive The Journal of Physical Chemistry B 111 51 14163 14168 |
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National Research Council Canada: NRC Publications Archive |
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ftnrccanada |
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English |
description |
The behavior of methane hydrate was investigated after it was pressurized with helium or nitrogen gas in a test system by monitoring the gas compositions. The results obtained indicate that even when the partial pressure of methane gas in such a system is lower than the equilibrium pressure at a certain temperature, the dissociation rate of methane hydrate is greatly depressed by pressurization with helium or nitrogen gas. This phenomenon is only observed when the total pressure of methane and helium (or nitrogen) gas in the system is greater than the equilibrium pressure required to stabilize methane hydrate with just methane gas. The following model has been proposed to explain the observed phenomenon: (1) Gas bubbles develop at the hydrate surface during hydrate dissociation, and there is a pressure balance between the methane gas inside the gas bubbles and the external pressurizing gas (methane and helium or nitrogen), as transmitted through the water film; as a result the methane gas in the gas bubbles stabilizes the hydrate surface covered with bubbles when the total gas pressure is greater than the equilibrium pressure of the methane hydrate at that temperature; this situation persists until the gas in the bubbles becomes sufficiently dilute in methane or until the surface becomes bubble-free. (2) In case of direct contact of methane hydrate with water, the water surrounding the hydrate is supersaturated with methane released upon hydrate dissociation; consequently, methane hydrate is stabilized when the hydrostatic pressure is above the equilibrium pressure of methane hydrate at a certain temperature, again until the dissolved gas at the surface becomes sufficiently dilute in methane. In essence, the phenomenon is due to the presence of a nonequilibrium state where there is a chemical potential gradient from the solid hydrate particles to the bulk solution that exists as long as solid hydrate remains. Peer reviewed: Yes NRC publication: Yes |
format |
Article in Journal/Newspaper |
author |
Lu, Hailong Tsuji, Yoshihiro Ripmeester, John A. |
spellingShingle |
Lu, Hailong Tsuji, Yoshihiro Ripmeester, John A. Stabilization of methane hydrate by pressurization with He or N2 Gas |
author_facet |
Lu, Hailong Tsuji, Yoshihiro Ripmeester, John A. |
author_sort |
Lu, Hailong |
title |
Stabilization of methane hydrate by pressurization with He or N2 Gas |
title_short |
Stabilization of methane hydrate by pressurization with He or N2 Gas |
title_full |
Stabilization of methane hydrate by pressurization with He or N2 Gas |
title_fullStr |
Stabilization of methane hydrate by pressurization with He or N2 Gas |
title_full_unstemmed |
Stabilization of methane hydrate by pressurization with He or N2 Gas |
title_sort |
stabilization of methane hydrate by pressurization with he or n2 gas |
publishDate |
2007 |
url |
https://doi.org/10.1021/jp076858t https://nrc-publications.canada.ca/eng/view/object/?id=ea16270b-5a3e-4a17-9ae3-21007da269d5 https://nrc-publications.canada.ca/fra/voir/objet/?id=ea16270b-5a3e-4a17-9ae3-21007da269d5 |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_relation |
issn:1520-6106 The Journal Of Physical Chemistry B, Volume: 111, Issue: 51, Publication date: 2007-12-07, Pages: 14163–14168 doi:10.1021/jp076858t irn:18077705 |
op_doi |
https://doi.org/10.1021/jp076858t |
container_title |
The Journal of Physical Chemistry B |
container_volume |
111 |
container_issue |
51 |
container_start_page |
14163 |
op_container_end_page |
14168 |
_version_ |
1766068009574596608 |