| 초록 |
In this study, the feasibility of gas hydrate-based sulfur hexafluoride (SF6) separation was investigated with a primary focus on its thermodynamic, kinetic and structural properties. The three-phase equilibria (hydrate (H)-liquid water (LW)-vapor (V)) of SF6 (50%, 80%, and 90%) + N2 hydrates were measured to determine thermodynamically stable regions of the corresponding gas hydrates. Furthermore, to examine the dissociation behavior of SF6+N2 hydrates, the heat of dissociation of SF6+N2 hydrates was measured through differential scanning calorimeter (DSC). The pressure-composition diagram at 275.15 K was also obtained to estimate the separation efficiency of SF6. In addition, the vapor composition change and the gas uptakes during hydrate formation were measured to observe the rate of hydrate formation. Finally, the structure of SF6+N2 hydrates was identified as sII via powder X-ray diffraction (PXRD). These experimental results obtained in this study are expected to provide useful background for gas hydrate-based SF6 separation. |
