Molecular Dynamics Simulation of Methane Hydrate Decomposition in the Presence of Alcohol Additives
Abstract The decomposition process of methane hydrate in pure water and methanol aqueous solution was studied by molecular dynamics simulation. The effects of temperature and pressure on hydrate structure and decomposition rate are discussed. The results show that decreasing pressure and increasing...
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crwiley:10.1002/cphc.201900742 2024-10-13T14:08:58+00:00 Molecular Dynamics Simulation of Methane Hydrate Decomposition in the Presence of Alcohol Additives Sun, Xiaoliang Zhou, Guanggang Zhu, Jianwei Wu, Haicheng Lu, Guiwu Bai, Dongsheng National Natural Science Foundation of China 2019 http://dx.doi.org/10.1002/cphc.201900742 https://onlinelibrary.wiley.com/doi/pdf/10.1002/cphc.201900742 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/cphc.201900742 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor ChemPhysChem volume 20, issue 19, page 2553-2565 ISSN 1439-4235 1439-7641 journal-article 2019 crwiley https://doi.org/10.1002/cphc.201900742 2024-09-17T04:45:26Z Abstract The decomposition process of methane hydrate in pure water and methanol aqueous solution was studied by molecular dynamics simulation. The effects of temperature and pressure on hydrate structure and decomposition rate are discussed. The results show that decreasing pressure and increasing temperature can significantly enhance the decomposition rate of hydrate. After adding a small amount of methanol molecules, bubbles with a diameter of about 2 nm are formed, and the methanol molecules are mainly distributed at the gas‐liquid interface, which greatly accelerates the decomposition rate and gas‐liquid separation efficiency. The radial distribution function and sequence parameter analysis show that the water molecules of the undecomposed hydrate with ordered ice‐like configuration at a temperature of 275 K evolve gradually into a long‐range disordered liquid structure in the dynamic relaxation process. It was found that at temperatures above 280 K and pressures between 10 atm and 100 atm, the pressure has no significant effect on hydrate decomposition rate, but when the pressure is reduced to 1 atm, the decomposition rate increases sharply. These findings provided a theoretical insight for the industrial exploitation of hydrates. Article in Journal/Newspaper Methane hydrate Wiley Online Library ChemPhysChem 20 19 2553 2565 |
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English |
description |
Abstract The decomposition process of methane hydrate in pure water and methanol aqueous solution was studied by molecular dynamics simulation. The effects of temperature and pressure on hydrate structure and decomposition rate are discussed. The results show that decreasing pressure and increasing temperature can significantly enhance the decomposition rate of hydrate. After adding a small amount of methanol molecules, bubbles with a diameter of about 2 nm are formed, and the methanol molecules are mainly distributed at the gas‐liquid interface, which greatly accelerates the decomposition rate and gas‐liquid separation efficiency. The radial distribution function and sequence parameter analysis show that the water molecules of the undecomposed hydrate with ordered ice‐like configuration at a temperature of 275 K evolve gradually into a long‐range disordered liquid structure in the dynamic relaxation process. It was found that at temperatures above 280 K and pressures between 10 atm and 100 atm, the pressure has no significant effect on hydrate decomposition rate, but when the pressure is reduced to 1 atm, the decomposition rate increases sharply. These findings provided a theoretical insight for the industrial exploitation of hydrates. |
author2 |
National Natural Science Foundation of China |
format |
Article in Journal/Newspaper |
author |
Sun, Xiaoliang Zhou, Guanggang Zhu, Jianwei Wu, Haicheng Lu, Guiwu Bai, Dongsheng |
spellingShingle |
Sun, Xiaoliang Zhou, Guanggang Zhu, Jianwei Wu, Haicheng Lu, Guiwu Bai, Dongsheng Molecular Dynamics Simulation of Methane Hydrate Decomposition in the Presence of Alcohol Additives |
author_facet |
Sun, Xiaoliang Zhou, Guanggang Zhu, Jianwei Wu, Haicheng Lu, Guiwu Bai, Dongsheng |
author_sort |
Sun, Xiaoliang |
title |
Molecular Dynamics Simulation of Methane Hydrate Decomposition in the Presence of Alcohol Additives |
title_short |
Molecular Dynamics Simulation of Methane Hydrate Decomposition in the Presence of Alcohol Additives |
title_full |
Molecular Dynamics Simulation of Methane Hydrate Decomposition in the Presence of Alcohol Additives |
title_fullStr |
Molecular Dynamics Simulation of Methane Hydrate Decomposition in the Presence of Alcohol Additives |
title_full_unstemmed |
Molecular Dynamics Simulation of Methane Hydrate Decomposition in the Presence of Alcohol Additives |
title_sort |
molecular dynamics simulation of methane hydrate decomposition in the presence of alcohol additives |
publisher |
Wiley |
publishDate |
2019 |
url |
http://dx.doi.org/10.1002/cphc.201900742 https://onlinelibrary.wiley.com/doi/pdf/10.1002/cphc.201900742 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/cphc.201900742 |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_source |
ChemPhysChem volume 20, issue 19, page 2553-2565 ISSN 1439-4235 1439-7641 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/cphc.201900742 |
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ChemPhysChem |
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20 |
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19 |
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2553 |
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2565 |
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1812815770133987328 |