| 초록 |
This study examined the feasibility of hydrate-based SF6 separation by measuring thermodynamic, structural, and kinetic characteristics of SF6 + N2 hydrates. First, the three-phase (hydrate (H) – water (LW) – vapor (V)) equilibria of SF6 + N2 hydrates were experimentally investigated to demonstrate the effect of N2 on the thermodynamic stability of SF6 + N2 hydrates. Second, a pressure-composition diagram was obtained using gas chromatograph (GC) to assess the SF6 separation efficiency. Third, the changes in SF6 compositions and the amount of gas consumption during hydrate formation were measured to study the hydrate formation rate and time-dependent selectivity of SF6 in the hydrate phase. The kinetic selectivity of SF6 was also confirmed using the direct composition measurement and in-situ Raman spectroscopy. Although SF6 was preferentially captured in the hydrate phase, significant kinetic selectivity of SF6 in the hydrate phase was not observed during the hydrate formation. The experimental results obtained in this study would be useful for designing and operating the hydrate-based SF6 separation process. |
