title: Pure SF6 and SF6-N2 mixture gas hydrates equilibrium and kinetic characteristics.
abstract: 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.
authors.affiliation: School of Materials Science and Engineering, Pusan National University, Geumjeoung-gu, Busan, Republic of Korea.
authors.forename: Eun Kyung
authors.initials: EK
authors.lastname: Lee
authors.forename: Ju Dong
authors.initials: JD
authors.lastname: Lee
authors.forename: Hyun Ju
authors.initials: HJ
authors.lastname: Lee
authors.forename: Bo Ram
authors.initials: BR
authors.lastname: Lee
authors.forename: Yoon Seok
authors.initials: YS
authors.lastname: Lee
authors.forename: Soo Min
authors.initials: SM
authors.lastname: Kim
authors.forename: Hye Ok
authors.initials: HO
authors.lastname: Park
authors.forename: Young Seok
authors.initials: YS
authors.lastname: Kim
authors.forename: Yeong-Do
authors.initials: YD
authors.lastname: Park
authors.forename: Yang Do
authors.initials: YD
authors.lastname: Kim
mesh_terms: D007700:Kinetics; D009584:Nitrogen / Q000737:chemistry; D013459:Sulfur Hexafluoride / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D009584:Nitrogen; D013459:Sulfur Hexafluoride