US4477419A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the recovery of CO2 from flue gases
Assignee: FLUOR DANIEL Inc A Corp OF
•
Filing: 1983-03-03
•
Granted: 1984-10-16
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Expires: 2003-03-03
Abstract
Abstract A method is disclosed for recovering carbon dioxide from gases containing the same as well as oxygen and/or sulfur compounds employing aqueous 5 to 80% alkanolamine solutions. Corrosion of the metals of construction and solvent degradation are minimized by the use of copper ion maintained in solution and continuous removal of ionic iron and solvent degradation products by treating the solvent or a portion of the solvent with a carbon bed, mechanical filter and/or a anion exchange resin.
Inventors
- 👤 Roscoe L. Pearce
- 👤 Richard A. Wolcott
- 👤 Charles R. Pauley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:03
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/14; B01D53/1418; B01D53/34; B01D53/1456; B01D53/1475; C; C01; C01B; C01B32/00; C01B32/50; Y; Y02; Y02C; Y02C20/00; Y02C20/40; Y02P; Y02P20/00; Y02P20/151
Claims Analysis
Total Claims: 46
Claim 1
Independent Claim
121 words
In a process for the recovery of carbon dioxide from feed gases containing the same and oxygen which may also contain sulfur compounds, by contacting the gas with a circulating alkanolamine solution containing copper and treating said solution rich in CO 2 with heat to release the CO 2 thereby producing a lean solution and returning the so treated lean solution to the contacting step, the improvement which comprises maintaining an amount of copper in said circulating solution effective to inhibit corrosion; and/or degradation of the solvent by contacting the circulating solution with at least one of the following (1) at least one mechanical filter; (2) activated carbon bed; (3) a strong base anion exchange resin; and/or (4) any combination thereof.
Claim 2
Dependent Claim
121 words
In a process for the recovery of carbon dioxide from feed gases containing the same and oxygen which may also contain sulfur compounds, by contacting the gas with a circulating alkanolamine solution containing copper and treating said solution rich in CO 2 with heat to release the CO 2 thereby producing a lean solution and returning the so treated lean solution to the contacting step, the improvement which comprises maintaining an amount of copper in said circulating solution effective to inhibit corrosion; and/or degradation of the solvent by contacting the circulating solution with at least one of the following (1) at least one mechanical filter; (2) activated carbon bed; (3) a strong base anion exchange resin; and/or (4) any combination thereof.
Claim 3
Dependent Claim
11 words
A process of claim 1 wherein the alkanolamine is a monoalkanolamine.
Claim 4
Dependent Claim
10 words
A process of claim 1 wherein the alkanolamine is monoethanolamine.
Claim 5
Dependent Claim
30 words
The process of claim 1 wherein a portion of the circulating solution is withdrawn and blown with an oxygen containing gas and said portion is returned to the alkanolamine circuit.
Claim 6
Dependent Claim
36 words
The process of claim 1 wherein the maximum bulk temperature of the heated alkanolamine is no greater than about 260° F. and is subjected to a heat flux of less than about 10,000 BTU/ft 2 /hr.
Claim 7
Dependent Claim
35 words
The process of claim 1 wherein the bulk temperature of the heated alkanolamine is about 244° to about 250° F. and is subjected to a heat flux of less than about 6000 BTU/ft 2 /hr.
Claim 8
Dependent Claim
20 words
The process of claim 1 wherein the copper ion is maintained at between about 50 ppm and about 750 ppm.
Claim 9
Dependent Claim
20 words
The process of claim 1 wherein the copper ion is maintained at between about 100 ppm and about 500 ppm.
Claim 10
Dependent Claim
36 words
The process of claim 1 wherein the circulating solution is subjected to treatment by contact with an activated carbon treater thereby to remove one or more of the soluble iron, insoluble iron and solvent degradation products.
Claim 11
Dependent Claim
33 words
The process of claim 1 wherein the circulating solution is subjected to treatment by contact with a mechanical filter thereby to remove one or more of the insoluble iron and solvent degradation products.
Claim 12
Dependent Claim
38 words
The process of claim 1 wherein the circulating solution is subjected to treatment by contact with a strong base anion exchange resin thereby to remove one or more of the soluble iron, insoluble iron and solvent degradation products.
Claim 13
Dependent Claim
40 words
The process of claim 1 wherein the circulating solution is subjected to treatment by contact with a mechanical filter and an activated carbon treater thereby to remove one or more of the soluble iron, insoluble iron and solvent degradation products.
Claim 14
Dependent Claim
42 words
The process of claim 1 wherein the circulating solution is subjected to treatment by contact with a mechanical filter and a strong base anion exchange resin thereby to remove one or more of the soluble iron, insoluble iron and solvent degradation products.
Claim 15
Dependent Claim
52 words
The process of claim 1 wherein the circulating solution is subjected to treatment by contact with a mechanical filter followed by an activated carbon treater, a second mechanical filter and a strong base anion exchange resin thereby to remove one or more of the soluble iron, insoluble iron and solvent degradation products.
Claim 16
Dependent Claim
13 words
The process of claim 1 wherein the feed gas is a flue gas.
Claim 17
Dependent Claim
17 words
The process of claim 1 wherein the feed gas is a gas from an internal combustion engine.
Claim 18
Dependent Claim
118 words
In a process for the recovery of carbon dioxide from feed gases containing the same and oxygen which may also contain sulfur compounds, by contacting the gas with a circulating alkanolamine solution containing copper and treating said solution rich in CO 2 with heat to release the CO 2 thereby producing a lean solution and returning the so treated lean solution to the contacting step, the improvement which comprises maintaining at least 5 parts of copper per million parts of solution in said circulating solution; by contacting the circulating solution with at least one of the following (1) at least one mechanical filter; (2) activated carbon; (3) a strong base anion exchange resin; and/or (4) any combination thereof.
Claim 19
Dependent Claim
118 words
In a process for the recovery of carbon dioxide from feed gases containing the same and oxygen which may also contain sulfur compounds, by contacting the gas with a circulating alkanolamine solution containing copper and treating said solution rich in CO 2 with heat to release the CO 2 thereby producing a lean solution and returning the so treated lean solution to the contacting step, the improvement which comprises maintaining at least 5 parts of copper per million parts of solution in said circulating solution; by contacting the circulating solution with at least one of the following (1) at least one mechanical filter; (2) activated carbon; (3) a strong base anion exchange resin; and/or (4) any combination thereof.
Claim 20
Dependent Claim
11 words
A process of claim 17 wherein the alkanolamine is a monoalkanolamine.
Claim 21
Dependent Claim
10 words
A process of claim 17 wherein the alkanolamine is monoethanolamine.
Claim 22
Dependent Claim
31 words
The process of claim 17 wherein a portion of the circulating solution is withdrawn and blown with an oxygen containing gas and such so-treated stream is returned to the alkanolamine circuit.
Claim 23
Dependent Claim
36 words
The process of claim 17 wherein the maximum bulk temperature of the heated alkanolamine is no greater than about 260° F. and is subjected to a heat flux of less than about 10,000 BTU/ft 2 /hr.
Claim 24
Dependent Claim
35 words
The process of claim 17 wherein the bulk temperature of the heated alkanolamine is about 244° to about 250° F. and is subjected to a heat flux of less than about 6000 BTU/ft 2 /hr.
Claim 25
Dependent Claim
19 words
The process of claim 17 wherein the copper ion is maintained at between about 50 ppm and 750 ppm.
Claim 26
Dependent Claim
19 words
The process of claim 17 wherein the copper ion is maintained at between about 100 ppm and 500 ppm.
Claim 27
Dependent Claim
36 words
The process of claim 17 wherein the circulating solution is subjected to treatment by contact with an activated carbon treater thereby to remove one or more of the soluble iron, insoluble iron and solvent degradation products.
Claim 28
Dependent Claim
33 words
The process of claim 17 wherein the circulating solution is subjected to treatment by contact with a mechanical filter thereby to remove one or more of the insoluble iron and solvent degradation products.
Claim 29
Dependent Claim
38 words
The process of claim 17 wherein the circulating solution is subjected to treatment by contact with a strong base annion exchange bed thereby to remove one or more of the soluble iron, insoluble iron and solvent degradation products.
Claim 30
Dependent Claim
40 words
The process of claim 17 wherein the circulating solution is subjected to treatment by contact with a mechanical filter and an activated carbon treater thereby to remove one or more of the soluble iron, insoluble iron and solvent degradation products.
Claim 31
Dependent Claim
42 words
The process of claim 17 wherein the circulating solution is subjected to treatment by contact with a mechanical filter and a strong base anion exchange bed thereby to remove one or more of the soluble iron, insoluble iron and solvent degradation products.
Claim 32
Dependent Claim
52 words
The process of claim 17 wherein the circulating solution is subjected to treatment by contact with a mechanical filter followed by an activated carbon treater, a second mechanical filter and a strong base anion exchange resin thereby to remove one or more of the soluble iron, insoluble iron and solvent degradation products.
Claim 33
Dependent Claim
13 words
The process of claim 17 wherein the feed gas is a flue gas.
Claim 34
Dependent Claim
17 words
The process of claim 17 wherein the feed gas is a gas from an internal combustion engine.
Claim 35
Dependent Claim
124 words
In a process for the recovery of carbon dioxide from feed gases containing the same and oxygen which may also contain sulfur compounds, by contacting the gas with a circulating aqueous 5 to 80% by weight alkanolamine solution containing copper and treating said solution rich in CO 2 with heat to release the CO 2 thereby producing a lean solution and returning the so treated lean solution to the contacting step, the improvement which comprises maintaining at least 5 parts of copper per million parts of solution in said circulating solution; by contacting the circulating solution with at least one of the following (1) at least one mechanical filter; (2) activated carbon; (3) a strong base anion exchange resin; and/or (4) any combination thereof.
Claim 36
Dependent Claim
124 words
In a process for the recovery of carbon dioxide from feed gases containing the same and oxygen which may also contain sulfur compounds, by contacting the gas with a circulating aqueous 5 to 80% by weight alkanolamine solution containing copper and treating said solution rich in CO 2 with heat to release the CO 2 thereby producing a lean solution and returning the so treated lean solution to the contacting step, the improvement which comprises maintaining at least 5 parts of copper per million parts of solution in said circulating solution; by contacting the circulating solution with at least one of the following (1) at least one mechanical filter; (2) activated carbon; (3) a strong base anion exchange resin; and/or (4) any combination thereof.
Claim 37
Dependent Claim
134 words
In a process for the recovery of carbon dioxide from feed gases containing the same and oxygen which may also contain sulfur compounds, by contacting the gas with a circulating aqueous 5 to 80% by weight alkanolamine solution containing copper and treating said solution rich in CO 2 with heat to release the CO 2 thereby producing a lean solution and returning the so treated lean solution to the contacting step, the improvement which comprises maintaining about 50 to about 750 parts of copper per million parts of solution in said circulating solution by contacting all or a portion of the circulating solution with the following series of treatments (1) a first mechanical filter, (2) an activated carbon bed, (3) a second mechanical filter, and (4) optionally, a strong base anion exchange resin bed.
Claim 38
Dependent Claim
134 words
In a process for the recovery of carbon dioxide from feed gases containing the same and oxygen which may also contain sulfur compounds, by contacting the gas with a circulating aqueous 5 to 80% by weight alkanolamine solution containing copper and treating said solution rich in CO 2 with heat to release the CO 2 thereby producing a lean solution and returning the so treated lean solution to the contacting step, the improvement which comprises maintaining about 50 to about 750 parts of copper per million parts of solution in said circulating solution by contacting all or a portion of the circulating solution with the following series of treatments (1) a first mechanical filter, (2) an activated carbon bed, (3) a second mechanical filter, and (4) optionally, a strong base anion exchange resin bed.
Claim 39
Dependent Claim
11 words
The process of claim 34 wherein the alkanolamine is a monoalkanolamine.
Claim 40
Dependent Claim
10 words
The process of claim 34 wherein the alkanolamine is monoethanolamine.
Claim 41
Dependent Claim
31 words
The process of claim 34 wherein a portion of the circulating solution is withdrawn and blown with an oxygen containing gas and such so-treated stream is returned to the alkanolamine circuit.
Claim 42
Dependent Claim
36 words
The process of claim 34 wherein the maximum bulk temperature of the heated alkanolamine is no greater than about 260° F. and is subjected to a heat flux of less than about 10,000 BTU/ft 2 /hr.
Claim 43
Dependent Claim
35 words
The process of claim 34 wherein the bulk temperature of the heated alkanolamine is about 244° to about 250° F. and is subjected to a heat flux of less than about 6000 BTU/ft 2 /hr.
Claim 44
Dependent Claim
19 words
The process of claim 34 wherein the copper ion is maintained at between about 100 ppm and 500 ppm.
Claim 45
Dependent Claim
13 words
The process of claim 34 wherein the feed gas is a flue gas.
Claim 46
Dependent Claim
17 words
The process of claim 34 wherein the feed gas is a gas from an internal combustion engine.
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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) | 1987-10-16 | 1988-04-16 | 1988-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-16 | 1992-04-16 | 1992-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-16 | 1996-04-16 | 1996-10-16 | $7700.00 | Window Closed / Lapsed |