Process for recovering CF.sub.4 and C.sub.2 F.sub.6 from a gas

Details Process for recovering CF.sub.4 and C.sub.2 F.sub.6 from a gas Process for recovering CF.sub.4 and C.sub.2 F.sub.6 from a gas

1996-12-23

1998-09-29

Spitzer, Robert

Gas separation: processes

Selective diffusion of gases

Selective diffusion of gases through substantially solid...

95 51, 95 54, 95131, 95287, 423240R, B01D 4600, B01D 5314, B01D 5322

Patent

active

058141278

ABSTRACT:
A process for recovering at least one of CF.sub.4 and C.sub.2 F.sub.6 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 fluorides and at least one of CF.sub.4 and C.sub.2 F.sub.6 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 CF.sub.4 and C.sub.2 F.sub.6, and a permeate stream depleted in at least one of CF.sub.4 and C.sub.2 F.sub.6.

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