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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received October 29, 2015
Accepted March 4, 2016

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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13C NMR analysis of C2H6+C2H4+THF mixed hydrate for an application to separation of C2H4 and C2H6

Jeasung Park Seong-Pil Kang¹ Jong-Won Lee^2†

IT Convergence Materials R&D Group, Korea Institute of Industrial Technology, 89 Yangdaegiro-gil, Ipjang-myeon, Cheonan-si, Chungnam 31056, Korea ¹Climate Change Research Division, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon 34129, Korea ²Department of Environmental Engineering, Kongju National University, 275 Budae-dong, Cheonan-si, Chungnam 31080, Korea

maruhill@kongju.ac.kr

Korean Journal of Chemical Engineering, July 2016, 33(7), 2186-2190(5), 10.1007/s11814-016-0068-8

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Abstract

Mixed hydrates (C2H4+5.56mol% THF, and C2H4+C2H6+5.56mol% THF) were analyzed using 13C MAS NMR spectroscopy. The hydrates were formed using a variety of feed gas compositions (100% C2H4; 20% C2H4+80% C2H6; 40% C2H4+60% C2H6; 60% C2H4+40% C2H6; and 80% C2H4+20% C2H6). According to the peak identification results, C2H4 molecules can occupy both the small and large cavities in the sI and sII hydrate structures, while C2H6 molecules can occupy only the large cavities of sI. Moreover, the mole fraction of C2H4 in the hydrate matrix was found to increase with increasing feed ratio of C2H4. On the basis of the NMR analysis, a hydrate-based process for separating C2H4 and C2H6 by repeated hydrate formation and dissociation was proposed. For cases with a feed-gas mixture with 20% C2H4 and 80% C2H6, a recovery of more than 88% C2H4 in the gas mixture could be achieved after five cycles of hydrate-based separation.

Keywords

Clathrate Hydrate Ethane Ethylene Tetrahydrofuran Separation 13C NMR

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