Patent US5226933A successfully refreshed from Google Patents.
US5226933A
Expired / Lapsed
US
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Pressure swing adsorption system to purify oxygen
Assignee: The Ohio State University
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Filing: 1992-03-31
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Granted: 1993-07-13
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Expires: 2012-03-31
Abstract
Abstract A pressure swing adsorption (PSA) process for splitting oxygen from a feed gas comprising 95% oxygen and 5% argon to achieve an oxygen purity of at least about 99.7% is provided. A column used in the PSA process includes therein a bed of silver mordenite, an adsorbent determined to be selective to argon. In a preferred embodiment, the feed gas has a pressure of about 10.7 atm and a flow rate of about 8.8-9.2 vol. per cycle/vol of column.
Inventors
- 👤 Kent S. Knaebel
- 👤 Alexander Kandybin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:23
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; B01D53/04; B01D53/047; B01D2253/00; B01D2253/10; B01D2253/106; B01D2253/108; B01D2253/25; B01D2256/00; B01D2256/12; B01D2257/00; B01D2257/10; B01D2257/11; B01D2259/00; B01D2259/40; B01D2259/40011; B01D2259/40028; B01D2259/4003; B01D2259/40035; B01D2259/40037; B01D2259/40043; B01D2259/4005; B01D2259/40052; B01D2259/40058; B01D2259/40064; B01D2259/40066; B01D2259/40077; B01D2259/40081; B01D2259/401; B01D2259/41; B01D2259/45; B01D2259/4533; B01D53/0476; B01D53/053
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
119 words
A process for obtaining a high purity oxygen product from a gas comprising oxygen and argon in a ratio of about 21:1, comprising the steps of: feeding a feed gas comprising oxygen and argon to a pressure swing adsorption column at a feed end thereof, the column including therein a bed of silver mordenite adsorbent selective to argon to produce a high purity oxygen feed product; adsorbing argon on the silver mordenite; subjecting the column to cocurrent blowdown to provide an enriched cocurrent blowdown oxygen product; countercurrently blowing down the column to provide an enriched argon product; purging the column with a purge stream comprised of feed product; pressurizing the column with feed product and cocurrent blowdown oxygen product.
Claim 2
Dependent Claim
119 words
A process for obtaining a high purity oxygen product from a gas comprising oxygen and argon in a ratio of about 21:1, comprising the steps of: feeding a feed gas comprising oxygen and argon to a pressure swing adsorption column at a feed end thereof, the column including therein a bed of silver mordenite adsorbent selective to argon to produce a high purity oxygen feed product; adsorbing argon on the silver mordenite; subjecting the column to cocurrent blowdown to provide an enriched cocurrent blowdown oxygen product; countercurrently blowing down the column to provide an enriched argon product; purging the column with a purge stream comprised of feed product; pressurizing the column with feed product and cocurrent blowdown oxygen product.
Claim 3
Dependent Claim
41 words
A process for obtaining a high purity oxygen product from a gas comprising oxygen and argon, as set forth in claim 1, wherein the step of feeding is conducted at a flow rate of about 8.8-9.2 vol. per cycle/vol. of column.
Claim 4
Dependent Claim
42 words
A process for obtaining a high purity oxygen product from a gas comprising oxygen and argon, as set forth in claim 1, wherein the step of feeding continues until the argon is about to break through a product end of said column.
Claim 5
Dependent Claim
36 words
A process for obtaining a high purity oxygen product from a gas comprising oxygen and argon, as set forth in claim 1, wherein the step of purging calls for a purge pressure of about 1.07 atm.
Claim 6
Dependent Claim
38 words
A process for obtaining a high purity oxygen product from a gas comprising oxygen and argon, as set forth in claim 1, wherein the flow rate of the purge stream is about 0.5 vol. per cycle/vol. of column.
Claim 7
Dependent Claim
38 words
A process for obtaining a high purity oxygen product from a gas comprising oxygen and argon, as set forth in claim 1, wherein the step of pressurizing comprises supplying the feed product and cocurrent blowdown oxygen product separately.
Claim 8
Dependent Claim
46 words
A process for obtaining a high purity oxygen product from a gas comprising oxygen and argon, as set forth in claim 1, wherein the step of pressurizing comprises supplying a mixture of the feed product and cocurrent blowdown oxygen product to the pressure swing adsorption column.
Claim 9
Dependent Claim
37 words
A process for obtaining a high purity oxygen product from a gas comprising oxygen and argon, as set forth in claim 1, wherein a cycle period of the process is in the range of about 10-12 minutes.
Claim 10
Dependent Claim
36 words
A process for obtaining a high purity oxygen product from a gas comprising oxygen and argon, as set forth in claim 1, wherein a level of recovery of oxygen according to the process is about 25%.
Claim 11
Dependent Claim
38 words
A process for obtaining a high purity oxygen product from a gas comprising oxygen and argon, as set forth in claim 1, wherein a level of productivity of the process is about 11 Nm 3 /M 3 hr.
Claim 12
Dependent Claim
29 words
A process for splitting oxygen from a gas comprising oxygen and argon, as set forth in claim 1, wherein the adsorbent comprises at least about 5.5% by mass silver.
Claim 13
Dependent Claim
29 words
A process for splitting oxygen from a gas comprising oxygen and argon, as set forth in claim 11, wherein the adsorbent comprises at least about 12% by mass silver.
Claim 14
Dependent Claim
35 words
A process for obtaining a high purity oxygen product from a gas comprising oxygen and argon, as set forth in claim 1, wherein the feed gas has a pressure of at least about 10.7 atm.
Claim 15
Dependent Claim
75 words
A process for splitting oxygen from a gas comprising oxygen and argon, comprising the steps of: feeding a feed gas comprising oxygen and argon to a pressure swing adsorption column at a feed end thereof at a pressure of at least 0.4 atm., the column including therein a bed of silver mordenite adsorbent selective to argon; adsorbing argon onto the silver mordenite adsorbent; recovering a product having an oxygen purity of at least about 99.7%.
Claim 16
Dependent Claim
75 words
A process for splitting oxygen from a gas comprising oxygen and argon, comprising the steps of: feeding a feed gas comprising oxygen and argon to a pressure swing adsorption column at a feed end thereof at a pressure of at least 0.4 atm., the column including therein a bed of silver mordenite adsorbent selective to argon; adsorbing argon onto the silver mordenite adsorbent; recovering a product having an oxygen purity of at least about 99.7%.
Claim 17
Dependent Claim
31 words
A process for splitting oxygen from a gas comprising oxygen and argon, as set forth in claim 14, wherein a cycle time of said process is at least about 7 minutes.
Claim 18
Dependent Claim
36 words
A process for splitting oxygen from a gas comprising oxygen and argon, as set forth in claim 15, wherein said feed gas is supplied at a flow rate of about 8.8-9.2 vol. per cycle/vol. of column.
Claim 19
Dependent Claim
30 words
A process for splitting oxygen from a gas comprising oxygen and argon, as set forth in claim 14, wherein said column operates at a temperature of at least 60° C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-07-12 | 1997-01-11 | 1997-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-12 | 2001-01-11 | 2001-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-12 | 2005-01-11 | 2005-07-13 | $7700.00 | Window Closed / Lapsed |