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US3813889A
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US
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Separation of gas mixtures
Assignee: Air Products and Chemicals Inc
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Filing: 1971-03-22
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Granted: 1974-06-04
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Expires: 1991-03-22
Abstract
Abstract A process and plant for obtaining substantially pure hydrogen or helium in which a mixture of hydrogen and/or helium and nitrogen and/or carbon monoxide, cooled to near its dew point at a pressure in the range 5 to 55 atmospheres, is fed into the bottom of a refrigerated wash-column while a liquid methane stream is fed in at the top. Hydrogen and/or helium is taken from the top of the column; a liquid stream containing methane and nitrogen and/or carbon monoxide is taken from the bottom.
Inventors
- 👤 R Allam
- 👤 B Bligh
- 👤 L Gaumer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:44
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/0204; F25J3/0209; B; B01; B01D; B01D53/00; B01D53/14; B01D53/18; C; C01; C01B; C01B23/00; C01B23/001; C01B23/0036; C01B3/00; C01B3/50; C01B3/506; F25J3/0223; F25J3/0228; F25J3/0252; F25J3/0257; F25J3/0261; F25J3/028; F25J3/029; F25J3/0295; F25J2200/00; F25J2200/90; F25J2205/00; F25J2205/30; F25J2205/40; F25J2205/60; F25J2245/00; F25J2245/02; F25J2270/00; F25J2270/02; F25J2270/04; F25J2270/08; F25J2270/24; F25J2290/00; F25J2290/42; Y; Y02; Y02C; Y02C20/00; Y02C20/20; Y10; Y10S; Y10S62/00; Y10S62/92; Y10S62/931; Y10S62/933
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
72 words
The process as claimed in claim 1 wherein a substantial portion of the cooling and condensing of the impurity stream is performed by: a. cooling said impurity stream in heat exchange with at least one colder product stream withdrawn from the process, and b. condensing said impurity stream against a portion of the methane withdrawn from said fractionation column before said methane portion is returned to said fractionation column as reboil fluid.
Claim 2
Dependent Claim
28 words
The process as claimed in claim 1 wherein a portion of said cooled and condensed impurity stream is introduced into the top of said fractionation column as reflux.
Claim 3
Dependent Claim
187 words
An absorption column comprising: a. wall means forming a shell for the column, b. inlet means for introducing a gaseous feed stream connected to the lower portion of said column, c. inlet means for introducing a wash liquid connected to upper portion of said column, d. first and second outlet means for discharging a purified product stream and an impurity stream, e. a plurality of trays in the upper portion of said column, f. partition means in the lower portion of said column forming a series of phase separators for separating said feed and wash fluids after direct contact thereof, g. a plurality of fluid contactors, each of said contactors being connected to two of said phase separators for contacting gaseous feed and wash liquid from a phase separator thereabove, h. fluid passage means in said contactors in indirect heat exchange with the feed and wash fluids therein, and i. a source of refrigerant connected to said fluid passage means in said contactors for passing refrigerant in indirect heat exchange with the feed and wash fluids for removing a substantial portion of the heat of absorption thereof.
Claim 4
Dependent Claim
41 words
The absorption column as claimed in claim 4 including a plurality of refrigeration coils positioned above at least some of said trays and immersed in the fluids on said trays for providing additional refrigeration to the top portion of said column.
Claim 5
Dependent Claim
47 words
The absorption column as claimed in claim 5 wherein said trays are perforated and said coils comprise horizontally extending, flat spirals of tubing positioned vertically above said perforations with spaces between concentric portions of said tubing for the passage of fluids vertically through said coils and perforations.
Claim 6
Dependent Claim
61 words
The absorption column as claimed in claim 5 including a source of refrigerant, a plurality of passage means connecting said plurality of refrigeration coils to said source of refrigerant, and a plurality of valve means in said passage means for controlling the flowrate of refrigerant to said coils for maintaining an optimum temperature profile along the upper portion of said column.
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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) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |