US4433981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
CO2 Removal from gaseous streams
Assignee: Shell USA Inc
•
Filing: 1981-06-26
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Granted: 1984-02-28
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Expires: 2001-06-26
Abstract
Abstract Carbon dioxide is removed from a gaseous stream by contacting the stream with an adsorbent prepared by impregnating a porous aluminum with an alkali metal or alkaline earth metal oxide or salt decomposable upon calcination and subsequently calcining the impregnated alumina at about 350° C.-700° C.
Inventors
- 👤 Lynn H. Slaugh
- 👤 Carl L. Willis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:50
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/04; B01J20/041; B01J20/06; B01J20/08; B01J20/30; B01J20/3078; B01J20/32; B01J20/3202; B01J20/3204; B01J20/3231; B01J20/3234; B01J20/3236; B01J20/34; B01J20/3433; B01J20/3483; Y; Y02; Y02C; Y02C20/00; Y02C20/40
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
61 words
A process for removing carbon dioxide from a gaseous stream which comprises contacting said stream at a temperature up to about 300° C. with an adsorbent prepared by impregnating a porous alumina with a sodium or potassium oxide or salt decomposable to the oxide and calcining the impregnated alumina at a temperature ranging from about 350° C. to about 850° C.
Claim 2
Dependent Claim
61 words
A process for removing carbon dioxide from a gaseous stream which comprises contacting said stream at a temperature up to about 300° C. with an adsorbent prepared by impregnating a porous alumina with a sodium or potassium oxide or salt decomposable to the oxide and calcining the impregnated alumina at a temperature ranging from about 350° C. to about 850° C.
Claim 3
Dependent Claim
26 words
The process of claim 1 where, in the adsorbent, the molar ratio of sodium or potassium metal to alumina ranges from about 2:1 to about 1:50.
Claim 4
Dependent Claim
19 words
The process of claim 2 where, in the adsorbent, the sodium or potassium salt is a carbonate or bicarbonate.
Claim 5
Dependent Claim
22 words
The process of claim 1 where, in the adsorbent, the impregnated alumina is calcined at about 350° C. to about 700° C.
Claim 6
Dependent Claim
26 words
The process of claim 4 where, in the adsorbent, the molar ratio of sodium or potassium metal to alumina ranges from about 2:1 to about 1:50.
Claim 7
Dependent Claim
19 words
The process of claim 5 where, in the adsorbent, the sodium or potassium salt is a carbonate or bicarbonate.
Claim 8
Dependent Claim
68 words
The process of claims 1, 2, 3, 4, 5 or 6 wherein after contacting the carbon dioxide-containing gaseous stream with the adsorbent for a substantial period of time, the flow of said stream is stopped, the absorbent is reheated to calcining temperature until substantially all of the carbon dioxide is stripped off, the adsorbent is cooled to operation conditions and the flow of the gaseous stream is resumed.
Claim 9
Dependent Claim
76 words
The process of claims 1, 2, 3, 4, 5 or 6 wherein after contacting the carbon dioxide-containing gaseous stream with the adsorbent for a substantial period of time, the flow of said stream is stopped, a stream of non-carbon dioxide-containing gas is passed over the adsorbent at calcining temperature until substantially all of the carbon dioxide is stripped off, the flow of non-carbon dioxide-containing gas is stopped and the flow of carbon dioxide-containing gas is resumed.
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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) | 1987-02-27 | 1987-08-29 | 1988-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-27 | 1991-08-29 | 1992-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-27 | 1995-08-29 | 1996-02-28 | $7700.00 | Window Closed / Lapsed |