Pure SF6 and SF6-N2 mixture gas hydrates equilibrium and kinetic characteristics.
Sulfur hexafluoride (SF6), whether pure or mixed with inexpensive inert gas, has been widely used in a variety of industrial processes, but it is one of the most potent greenhouse gases. For this reason, it is necessary to separate and/or collect it from waste gas streams. In this study, we investigated the pure SF6 and SF6-N2 mixture gas hydrates formation equilibrium aswell asthe gas separation efficiency in the hydrate process. The equilibrium pressure of SF6-N2 mixture gas was higher than that of pure SF6 gas. Phase equilibrium data of SF6-N2 mixture gas was similar to SF6 rather than N2. The kinetics of SF6-N2 mixture gas was controlled by the amount of SF6 at the initial gas composition as well as N2 gas incorporation into the S-cage of structure-II hydrate preformed by the SF6 gas. Raman analysis confirmed the N2 gas incorporation into the S-cage of structure-II hydrate. The compositions in the hydrate phase were found to be 71, 79, 80, and 81% of SF6 when the feed gas compositions were 40, 65, 70, and 73% of SF6, respectively. The present study provides basic information for the separation and purification of SF6 from mixed SF6 gas containing inert gases.
Lee
Eun Kyung
EK
School of Materials Science and Engineering, Pusan National University, Geumjeoung-gu, Busan, Republic of Korea.
Lee
Ju Dong
JD
Lee
Hyun Ju
HJ
Lee
Bo Ram
BR
Lee
Yoon Seok
YS
Kim
Soo Min
SM
Park
Hye Ok
HO
Kim
Young Seok
YS
Park
Yeong-Do
YD
Kim
Yang Do
YD
D007700:Kinetics; D009584:Nitrogen / Q000737:chemistry; D013459:Sulfur Hexafluoride / Q000737:chemistry* / Q000302:isolation & purification
D009584:Nitrogen; D013459:Sulfur Hexafluoride