EP0743088A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Pressure driven electrolytic membrane gas separation method and system
Assignee: Praxair Technology Inc
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Filing: 1996-03-21
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Granted: —
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Expires: 2016-03-21
Abstract
Abstract A process for removing oxygen from a feed stream to obtain an oxygen-depleted product stream by applying the feed stream to at least one separator including a feed zone and a permeate zone separated by a solid electrolyte mixed conductor membrane, and driving a first portion of entrained oxygen in the feed stream from the feed zone to the permeate zone via the mixed conductor membrane by applying at least one of a purge stream and a negative pressure to the permeate zone to establish a lower partial pressure of oxygen in that zone. Oxygen-depleted retentate is withdrawn as a product stream. Preferably, at least one additional solid electrolyte ionic or mixed conductor membrane is also employed in feed series with the mixed conductor membrane.
Inventors
- 👤 Ravi Prasad
- 👤 Christian Friedrich Gottzmann
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 12:43
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/02; B01D71/024; B01D53/00; B01D53/22; B01D53/32; B01D53/326; B01D2325/00; B01D2325/26
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
226 words
A process for removing oxygen from a feed stream to obtain an oxygen-depleted product stream, comprising: applying said feed stream to a first separator including a first feed zone and a first permeate zone separated by a first solid electrolyte ionic or mixed conduction membrane; driving a first portion of entrained oxygen in said feed stream from said first feed zone to said first permeate zone via said first membrane; directing a feed stream output from said first feed zone of said first separator to a second feed zone of at least a second separator, said second separator provided with a second permeate zone separated from said second feed zone by a second solid electrolyte ionic or mixed conduction membrane; driving a second portion of oxygen, which is entrained in said feed stream output from said first feed zone, from said second feed zone to said second permeate zone via said second membrane; obtaining an oxygen-depleted product stream after entrained oxygen has been removed from said second feed zone; and at least one of said first and second membranes being a mixed conductor, wherein said driving for the separator containing that membrane is accomplished by establishing a lower partial pressure of oxygen in the permeate zone for that membrane by applying at least one of a purge stream and a negative pressure to that permeate zone.
Claim 2
Dependent Claim
17 words
The process of claim 1 wherein said separator including said mixed conductor membrane is said first separator.
Claim 3
Dependent Claim
35 words
The process of claim 2 wherein said second membrane is an ionic membrane, and the step of driving for said second separator includes providing an electrical current to and a voltage across said second membrane.
Claim 4
Dependent Claim
29 words
The process of claim 2 wherein the step of driving for said first separator utilizes both a purge stream and a negative pressure applied to said first permeate zone.
Claim 5
Dependent Claim
18 words
The process of claim 2 wherein said second membrane in said second separator includes a mixed conductor material.
Claim 6
Dependent Claim
29 words
The process of claim 5 wherein a first purge stream is applied to said first permeate zone and a second purge stream is applied to said second permeate zone.
Claim 7
Dependent Claim
20 words
The process of claim 6 wherein said second purge stream has a lower oxygen concentration than said first purge stream.
Claim 8
Dependent Claim
29 words
The process of claim 5 wherein a first negative pressure is applied to said first permeate zone and a second negative pressure is applied to said second permeate zone.
Claim 9
Dependent Claim
17 words
The process of claim 8 wherein said second negative pressure is lower than said first negative pressure.
Claim 10
Dependent Claim
45 words
The process of claim 1 wherein the step of driving for at least one of said first and second separators includes diverting a portion of output from at least one of said first and second feed zones to purge the permeate zone of that separator.
References Cited (Backward Citations)
No citation records indexed.
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