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- In relation to this article, we declare that there is no conflict of interest.
- Publication history
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Received November 28, 2022
Revised December 22, 2022
Accepted December 23, 2022
- Acknowledgements
- This research was supported by the National Research Foundation of Korea (NRF) (NRF-2021R1A2C2005856 and RS-2022- 00144163) and Research Institute of Industrial Science & Technology, Korea (2022H005). This research was also supported by the Carbon Neutral Institute Research Fund (Project # 1.220095.01) of UNIST
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Guest distributions and dissociation enthalpy of fluorinated gas (CHF3 or C2F6)+N2 hydrates for hydrate-based gas separation
1Department of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Korea 2Particulate Matter Research Center, Research Institute of Industrial Science & Technology, Jeollanam-do 57801, Korea 3Graduate School of Carbon Neutrality, Ulsan National Institute of Science and Technology, Ulsan 44919, Korea
ywseo@unist.ac.kr
Korean Journal of Chemical Engineering, July 2023, 40(7), 1725-1730(6), 10.1007/s11814-023-1385-3
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Abstract
Fluorinated gases (F-gases), such as CHF3 and C2F6, which are used in the semiconductor industry and
have considerable global warming potential, can be recovered after use through a gas hydrate-based separation method
to prevent their release into the atmosphere. In this study, the guest distributions and dissociation enthalpy (Hd) of Fgas (CHF3 or C2F6)+N2 hydrates with different F-gas concentrations (CHF3: 20%, 80%, and 100% and C2F6: 20%, 60%,
80%, and 100%) were experimentally investigated using a powder X-ray diffractometer and a high-pressure micro-differential scanning calorimeter, respectively. At high N2 concentrations in the feed gas, the occupancy of N2 in the small
(512) cages of the F-gas+N2 hydrates increased significantly. As a result, the F-gas+N2 hydrates exhibited reduced hydration numbers at high N2 concentration. The Hd values (in kJ/mol gas) of the F-gas (CHF3 or C2F6)+N2 hydrates
decreased with increased N2 concentration. The overall experimental results provide useful insights into the design and
operation of gas hydrate-based F-gas separation processes
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