| 초록 |
This study investigated hydrate-based gas separation (HBGS) to capture sulfur hexafluoride (SF6), one of the most potent greenhouse gases, from gas mixtures with a primary focus on its kinetic selectivity. A time-dependent SF6 selectivity in the hydrate phase during hydrate formation was examined with SF6 (50%) + N2 (50%) gas mixtures at 8.0 MPa and 275.15 K. Enclathrating behaviors of SF6 and N2 in the hydrate phase were analyzed by observing the changes in the intensity and area of enclathrated SF6 and N2 molecules using in-situ Raman spectroscopy. Furthermore, gas uptakes and changes in SF6 compositions in the vapor phase were measured during hydrate formation to demonstrate the rate of hydrate formation and time-dependent selectivity of SF6 in the hydrate phase. SF6 had a higher thermodynamic selectivity in the hydrate phase compared to N2, but SF6 was not kinetically selective in the hydrate phase during the hydrate formation. The experimental results obtained in this study would be useful for designing and operating the hydrate-based SF6 separation process from SF6 + N2 gas mixtures. |
