Pure SF6 and SF6-N2 mixture gas hydrates equilibrium and kinetic characteristics

Environmental Science & Technology
Eun Kyung LeeYang Do Kim

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.

References

Sep 5, 2003·Environmental Science & Technology·Sangyong LeeEric Adams
Dec 9, 2008·Journal of Colloid and Interface Science·Bo Ram LeeYang Do Kim

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Citations

Jun 23, 2020·Chemical Society Reviews·Aliakbar HassanpouryouzbandBahman Tohidi
Jan 22, 2021·Environmental Science & Technology·Jiyeong JangJi-Ho Yoon
Aug 14, 2010·Environmental Science & Technology·Inuk ChaYongwon Seo

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