Staged electrolyte membrane

Details Staged electrolyte membrane Staged electrolyte membrane

B - Operations, Transporting

01

D

B01D 61/42 (2006.01) B01D 53/32 (2006.01) C01B 13/02 (2006.01)

Patent

CA 2172323

Oxygen is separated from a feed air stream to produce enriched oxygen permeate and oxygen depleted retentate gas. At least first and second process stages, arranged in series, each include a solid electrolyte membrane separating gas chambers with a retentate side in the former and a permeate side in the latter, a cathode connected to the retentate side, and an anode connected to the permeate side. Feed gas is introduced into a first gas chamber of the first process stage. The cathode and anode of the first process stage are electrically energized to drive oxygen from the feed gas in the first gas chamber through the electrolyte membrane at a first flux into a second gas chamber. Oxygen-depleted retentate gas from the first process stage is delivered to a third gas chamber of the second process stage. Similarly, the cathode and anode of the second process stage are electrically energized by a current less than that of the first process stage and at a greater voltage. Oxygen-depleted retentate gas is withdrawn from the second process stage and permeated oxygen is withdrawn from the second gas chamber and a fourth gas chamber of the first and second process stages.

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