Lan-Ying Yang

China University of Petroleum, Beijing

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Guangjin Chen

China University of Petroleum, Beijing

Chang‐Yu Sun

China University of Petroleum, Beijing

Qiang Sun

Institute of Applied Physics and Computational Mathematics

Aixian Liu

China University of Petroleum, Beijing

Xuqiang Guo

China University of Petroleum, Beijing

Qing-Lan Ma

China University of Petroleum, Beijing

Bei Liu

China University of Petroleum, Beijing

Xuqiang Guo

China University of Petroleum, Beijing

Yiwei Wang

University of California, Santa Cruz

Xingxun Li

China University of Petroleum, Beijing

Cooperative Institutions

China University of Petroleum, Beijing

Chinese Academy of Sciences

Sinopec (China)

University of Chinese Academy of Sciences

China University of Petroleum, East China

Dalian University of Technology

Tsinghua University

Sichuan University

Wuhan University of Technology

Huazhong University of Science and Technology

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Self-preservation and structural transition of gas hydrates during dissociation below the ice point: an in situ study using Raman spectroscopy

Scientific Reports (2016)

Jin‐Rong Zhong Xin-Yang Zeng Feng-He Zhou Qi-Dong Ran Chang‐Yu Sun

Abstract The hydrate structure type and dissociation behavior for pure methane and methane-ethane hydrates at temperatures below the ice point and atmospheric pressure were investigated using in situ Raman spectroscopic analysis. The self-preservation effect of sI methane hydrate is significant at lower temperatures (268.15 to 270.15 K), as determined by the stable C-H region Raman peaks and A L / A S value (Ratio of total peak area corresponding to occupancies of guest molecules in large cavities to small cavities) being around 3.0. However, it was reduced at higher temperatures (271.15 K and 272.15 K), as shown from the dramatic change in Raman spectra and fluctuations in A L / A S values. The self-preservation effect for methane-ethane double hydrate is observed at temperatures lower than 271.15 K. The structure transition from sI to sII occurred during the methane-ethane hydrate decomposition process, which was clearly identified by the shift in peak positions and the change in relative peak intensities at temperatures from 269.15 K to 271.15 K. Further investigation shows that the selectivity for self-preservation of methane over ethane leads to the structure transition; this kind of selectivity increases with decreasing temperature. This work provides new insight into the kinetic behavior of hydrate dissociation below the ice point.

Clathrate hydrate

10.1038/srep38855

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Citations (49)

Study on ethane hydrate formation/dissociation in a sub-millimeter sized capillary

Chemical Engineering Science (2019)

Qiang Sun Mei Du Xingxun Li Xuqiang Guo Aixian Liu

Subcooling

Clathrate hydrate

Liquid bubble

10.1016/j.ces.2019.05.024

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