PROCESS FOR RECOVERING CF4 AND C2F6 FROM A GAS

摘要

A process for recovering at least one of CF4 and C2F6 from a vent gas from an aluminum electrolysis cell. The process includes the steps of: (a) removing inorganic fluorides from a vent gas comprising inorganic florides and at least one of CF4 and C2F6 to obtain a purified vent gas; and (b) contacting the purified vent gas with a membrane at conditions effective to obtain a retentate stream rich in at least one of CF4 and C2F6, and a permeate stream depleted in at least one of CF4 and C2F6.