Measurements of diffusion coefficient of methane in water/brine under high pressure
The diffusion coefficient of methane in water plays an important role in the formation and dissociation of methane hydrate. However, most of the previous studies on the diffusion coefficient of methane in brine are performed at room temperature and low pressures, which is quite different from the fo...
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ftdoajarticles:oai:doaj.org/article:551b921afff84b2eaea798e38fc77a00 2023-05-15T17:11:53+02:00 Measurements of diffusion coefficient of methane in water/brine under high pressure Yen-An Chen Che-Kang Chu Yan-Ping Chen Lee-Shin Chu Shiang-Tai Lin Li-Jen Chen 2018-01-01T00:00:00Z https://doi.org/10.3319/TAO.2018.02.23.02 https://doaj.org/article/551b921afff84b2eaea798e38fc77a00 EN eng Springer http://tao.cgu.org.tw/media/k2/attachments/v295p577.pdf https://doaj.org/toc/1017-0839 https://doaj.org/toc/2311-7680 1017-0839 2311-7680 doi:10.3319/TAO.2018.02.23.02 https://doaj.org/article/551b921afff84b2eaea798e38fc77a00 Terrestrial, Atmospheric and Oceanic Sciences, Vol 29, Iss 5, Pp 577-587 (2018) Geology QE1-996.5 Geophysics. Cosmic physics QC801-809 article 2018 ftdoajarticles https://doi.org/10.3319/TAO.2018.02.23.02 2022-12-30T23:54:15Z The diffusion coefficient of methane in water plays an important role in the formation and dissociation of methane hydrate. However, most of the previous studies on the diffusion coefficient of methane in brine are performed at room temperature and low pressures, which is quite different from the formation condition of methane hydrate. In this study, we measure the diffusion coefficient of methane in pure water and brine in capillary tube at 10.3 MPa and temperature ranging from 283.15 to 308.15 K. We use the Raman spectrum to measure the ratio of C-H bound signal of methane to the O-H bound signal of water, to estimate the concentration of methane dissolves in water/brine. The Raman spectrum is collected at different time and different positions away from the liquid-gas interface. Diffusion coefficient is determined by fitting the experimental data with the concentration profiles solved from Fick’s second law and semi-infinity boundary condition. By this method, we can evaluate the diffusion coefficient at different temperatures or salinities. The diffusion coefficient of methane in water/brine increases as the temperature increases. The diffusion coefficient of methane in brine is lower than that in pure water. Molecular dynamics (MD) simulation is also performed in this study to calculate the diffusion coefficient of methane in water/brine. The MD results can successfully predict the tendency of temperature effect and adding electrolyte. Article in Journal/Newspaper Methane hydrate Directory of Open Access Journals: DOAJ Articles Terrestrial, Atmospheric and Oceanic Sciences 29 5 577 587 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Geology QE1-996.5 Geophysics. Cosmic physics QC801-809 |
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Geology QE1-996.5 Geophysics. Cosmic physics QC801-809 Yen-An Chen Che-Kang Chu Yan-Ping Chen Lee-Shin Chu Shiang-Tai Lin Li-Jen Chen Measurements of diffusion coefficient of methane in water/brine under high pressure |
topic_facet |
Geology QE1-996.5 Geophysics. Cosmic physics QC801-809 |
description |
The diffusion coefficient of methane in water plays an important role in the formation and dissociation of methane hydrate. However, most of the previous studies on the diffusion coefficient of methane in brine are performed at room temperature and low pressures, which is quite different from the formation condition of methane hydrate. In this study, we measure the diffusion coefficient of methane in pure water and brine in capillary tube at 10.3 MPa and temperature ranging from 283.15 to 308.15 K. We use the Raman spectrum to measure the ratio of C-H bound signal of methane to the O-H bound signal of water, to estimate the concentration of methane dissolves in water/brine. The Raman spectrum is collected at different time and different positions away from the liquid-gas interface. Diffusion coefficient is determined by fitting the experimental data with the concentration profiles solved from Fick’s second law and semi-infinity boundary condition. By this method, we can evaluate the diffusion coefficient at different temperatures or salinities. The diffusion coefficient of methane in water/brine increases as the temperature increases. The diffusion coefficient of methane in brine is lower than that in pure water. Molecular dynamics (MD) simulation is also performed in this study to calculate the diffusion coefficient of methane in water/brine. The MD results can successfully predict the tendency of temperature effect and adding electrolyte. |
format |
Article in Journal/Newspaper |
author |
Yen-An Chen Che-Kang Chu Yan-Ping Chen Lee-Shin Chu Shiang-Tai Lin Li-Jen Chen |
author_facet |
Yen-An Chen Che-Kang Chu Yan-Ping Chen Lee-Shin Chu Shiang-Tai Lin Li-Jen Chen |
author_sort |
Yen-An Chen |
title |
Measurements of diffusion coefficient of methane in water/brine under high pressure |
title_short |
Measurements of diffusion coefficient of methane in water/brine under high pressure |
title_full |
Measurements of diffusion coefficient of methane in water/brine under high pressure |
title_fullStr |
Measurements of diffusion coefficient of methane in water/brine under high pressure |
title_full_unstemmed |
Measurements of diffusion coefficient of methane in water/brine under high pressure |
title_sort |
measurements of diffusion coefficient of methane in water/brine under high pressure |
publisher |
Springer |
publishDate |
2018 |
url |
https://doi.org/10.3319/TAO.2018.02.23.02 https://doaj.org/article/551b921afff84b2eaea798e38fc77a00 |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_source |
Terrestrial, Atmospheric and Oceanic Sciences, Vol 29, Iss 5, Pp 577-587 (2018) |
op_relation |
http://tao.cgu.org.tw/media/k2/attachments/v295p577.pdf https://doaj.org/toc/1017-0839 https://doaj.org/toc/2311-7680 1017-0839 2311-7680 doi:10.3319/TAO.2018.02.23.02 https://doaj.org/article/551b921afff84b2eaea798e38fc77a00 |
op_doi |
https://doi.org/10.3319/TAO.2018.02.23.02 |
container_title |
Terrestrial, Atmospheric and Oceanic Sciences |
container_volume |
29 |
container_issue |
5 |
container_start_page |
577 |
op_container_end_page |
587 |
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1766068634684227584 |