US4474586A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas separation process
Assignee: Permea Inc
•
Filing: 1983-12-05
•
Granted: 1984-10-02
•
Expires: 2003-12-05
Abstract
Abstract Process for recovering a permeating gas from a pair of gas streams one of which contains less than 30 percent of the permeating gas and the other of which contains more than 70 percent of the permeating gas wherein the other gas stream is brought into contact with a membrane through which a portion of the permeating gas passes. Non-permeating gases are mixed with the one stream and brought into contact with another membrane through which the permeating gas will pass, with the permeating gases from the membrane being combined and collected.
Inventors
- 👤 Arthur W. Rice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:39
CPC Classifications
B; B01; B01D; B01D59/00; B01D59/10; B01D59/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
144 words
A process for recovering a permeating gas from a pair of gas streams one of which contains less than 30 percent of the permeating gas and the other of which contains more than 70 percent of said permeating gas, comprising (a) bringing the one gas stream into contact with a first membrane more permeable to the permeating gas than other gases in the stream to remove a portion of said permeating gas from said one stream; (b) bringing the other gas stream into contact with a second membrane more permeable to the permeating gas than other gases of the stream to remove a portion of said permeating gas from said other stream; (c) mixing non-permeated gases from the second membrane with said one gas stream upstream of said first membrane, and (d) combining the permeated gases removed from said one and said other stream.
Claim 2
Dependent Claim
144 words
A process for recovering a permeating gas from a pair of gas streams one of which contains less than 30 percent of the permeating gas and the other of which contains more than 70 percent of said permeating gas, comprising (a) bringing the one gas stream into contact with a first membrane more permeable to the permeating gas than other gases in the stream to remove a portion of said permeating gas from said one stream; (b) bringing the other gas stream into contact with a second membrane more permeable to the permeating gas than other gases of the stream to remove a portion of said permeating gas from said other stream; (c) mixing non-permeated gases from the second membrane with said one gas stream upstream of said first membrane, and (d) combining the permeated gases removed from said one and said other stream.
Claim 3
Dependent Claim
16 words
The process of claim 1 wherein said process has a performance parameter of at least 0.6.
Claim 4
Dependent Claim
16 words
The process of claim 2 wherein said process has a performance parameter of at least 0.7.
Claim 5
Dependent Claim
34 words
The process of claim 1 wherein the difference between the percentages of said permeating gas in said one stream and the percentage of said permeating gas in said other stream is at least 50.
References Cited (Backward Citations)
US3250080A
Cited
US3442002A
Cited
US3713271A
Cited
US3930814A
Cited
US4119417A
Cited
US4230463A
Cited
US4397661A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-02 | 1988-04-02 | 1988-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-02 | 1992-04-02 | 1992-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-02 | 1996-04-02 | 1996-10-02 | $7700.00 | Window Closed / Lapsed |