US4624839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the recovery of CO2 from flue gases
Assignee: Fluor Daniel Inc
•
Filing: 1985-02-19
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Granted: 1986-11-25
•
Expires: 2005-02-19
Abstract
Abstract There is disclosed a procedure for removing copper inhibitor from a circulating fluid which contains the same, which copper may be lost on the cool side of a gas conditioning system by plating out under certain conditions, by contacting a portion of the circulating hot fluid with an activated carbon bed to sorb the copper in excess of the solubility limits within said fluid, regenerating said carbon bed when saturated by contacting said carbon bed with cool circulating fluid, thus returning copper which may have plated out to the circulating fluid in an amount and in an ionic state which will not plate out in the system, the circulating fluid is also treated on the cool side by mechanical filtration, activated carbon sorption and/or ion exchange to remove physical and chemical impurities, contaminates and degradation products.
Inventors
- 👤 Richard A. Wolcott
- 👤 Roscoe L. Pearce
- 👤 Charles R. Pauley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:56
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/14; B01D53/1456; B01D53/1475; B01D53/1425; B01D53/1493; Y; Y02; Y02C; Y02C20/00; Y02C20/40
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
233 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 as an inhibitor, to absorb the CO 2 and thereafter treating said solution rich and CO 2 with heat to release the CO 2 thereby producing a hot lean solution and returning the so treated lean solution after cooling 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 (a) by contacting all or a portion of said cool lean circulating solution with at least one of the following (1) at least one mechanical filter; (2) activated carbon bed; (3) strong base anion exchange resin; and/or (4) any combination thereof; and (b) by (1) withdrawing a portion of the hot lean solution after the release of the CO 2 by heat and, prior to cooling and/or contact with (a)(1), (2) and/or (3), treating said withdrawn hot portion by passing it through a carbon bed independant of (a)(2) to reduce the dissolved ionic cooper in the hot solution; (2) stopping said withdrawal of hot lean solution; (3) contacting said carbon bed with cool lean solution to redissolve the copper from the carbon bed and returning said copper containing lean cool solution to the absorber.
Claim 2
Dependent Claim
233 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 as an inhibitor, to absorb the CO 2 and thereafter treating said solution rich and CO 2 with heat to release the CO 2 thereby producing a hot lean solution and returning the so treated lean solution after cooling 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 (a) by contacting all or a portion of said cool lean circulating solution with at least one of the following (1) at least one mechanical filter; (2) activated carbon bed; (3) strong base anion exchange resin; and/or (4) any combination thereof; and (b) by (1) withdrawing a portion of the hot lean solution after the release of the CO 2 by heat and, prior to cooling and/or contact with (a)(1), (2) and/or (3), treating said withdrawn hot portion by passing it through a carbon bed independant of (a)(2) to reduce the dissolved ionic cooper in the hot solution; (2) stopping said withdrawal of hot lean solution; (3) contacting said carbon bed with cool lean solution to redissolve the copper from the carbon bed and returning said copper containing lean cool solution to the absorber.
Claim 3
Dependent Claim
12 words
A process of claim 1 wherein the alkanol amine is a monoalkanolamine.
Claim 4
Dependent Claim
11 words
A process of claim 1 wherein the alkanol amine 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
37 words
The process of claim 1 wherein the cool 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
53 words
The process of claim 1 wherein the cool 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
224 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 as an inhibitor, and treating said solution rich in CO 2 with heat to release the CO 2 thereby thereby producing a lean solution and returning the so treated lean solution, after cooling, to the contacting step, the improvement which comprises maintaining at least 5 parts of copper per million parts solution in said circulating solution; (a) by contacting all or a portion of said cool lean circulating solution with at least one of the following (1) at least one mechanical filter; (2) activated carbon bed; (3) strong base anion exchange resin; and/or (4) any combination thereof; and (b) by (1) withdrawing a portion of the hot lean solution after the release of the CO 2 by heat and, prior to cooling and/or contact with (a)(1), (2) and/or (3), treating said withdrawn hot portion by passing it through a carbon bed independant of (a)(2) to reduce the dissolved ionic copper in the hot solution; (2) stopping said withdrawal of hot lean solution; (3) contacting said carbon bed with cool lean solution to redissolve the copper from the carbon bed and returning said copper containing lean cool solution to the absorber.
Claim 19
Dependent Claim
224 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 as an inhibitor, and treating said solution rich in CO 2 with heat to release the CO 2 thereby thereby producing a lean solution and returning the so treated lean solution, after cooling, to the contacting step, the improvement which comprises maintaining at least 5 parts of copper per million parts solution in said circulating solution; (a) by contacting all or a portion of said cool lean circulating solution with at least one of the following (1) at least one mechanical filter; (2) activated carbon bed; (3) strong base anion exchange resin; and/or (4) any combination thereof; and (b) by (1) withdrawing a portion of the hot lean solution after the release of the CO 2 by heat and, prior to cooling and/or contact with (a)(1), (2) and/or (3), treating said withdrawn hot portion by passing it through a carbon bed independant of (a)(2) to reduce the dissolved ionic copper in the hot solution; (2) stopping said withdrawal of hot lean solution; (3) contacting said carbon bed with cool lean solution to redissolve the copper from the carbon bed and returning said copper containing lean cool solution to the absorber.
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
37 words
The process of claim 17 wherein the cool 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 anion 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
53 words
The process of claim 17 wherein the cool circulating solution is subected 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 as 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
231 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 liquid aqueous 5 to 80% by weight alkanolamine solution, containing copper as an inhibitor and treating said solution rich in CO 2 with heat to release the CO 2 thereby producing a hot lean solution and returning the so treated lean solution, after cooling, to the contacting step, the improvement which comprises maintaining at least 5 parts of copper per million parts solution in said circulating solution; (a) by contacting all or a portion of said cool lean circulating solution with at least one of the following (1) at least one mechanical filter; (2) activated carbon bed; (3) strong base anion exchange resin: and/or (4) any combination thereof; and (b) by (1) withdrawing a portion of the hot lean solution after the release of the CO 2 by heat and, prior to cooling and/or contact with (a)(1), (2) and/or (3), treating said withdrawn hot portion by passing it through a carbon bed independant of (a)(2) to reduce the dissolved ionic copper in the hot solution; (2) stopping said withdrawal of hot lean solution; (3) contacting said carbon bed with cool lean solution to redissolve the copper from the carbon bed and returnning said copper containing lean cool solution to the absorber.
Claim 36
Dependent Claim
231 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 liquid aqueous 5 to 80% by weight alkanolamine solution, containing copper as an inhibitor and treating said solution rich in CO 2 with heat to release the CO 2 thereby producing a hot lean solution and returning the so treated lean solution, after cooling, to the contacting step, the improvement which comprises maintaining at least 5 parts of copper per million parts solution in said circulating solution; (a) by contacting all or a portion of said cool lean circulating solution with at least one of the following (1) at least one mechanical filter; (2) activated carbon bed; (3) strong base anion exchange resin: and/or (4) any combination thereof; and (b) by (1) withdrawing a portion of the hot lean solution after the release of the CO 2 by heat and, prior to cooling and/or contact with (a)(1), (2) and/or (3), treating said withdrawn hot portion by passing it through a carbon bed independant of (a)(2) to reduce the dissolved ionic copper in the hot solution; (2) stopping said withdrawal of hot lean solution; (3) contacting said carbon bed with cool lean solution to redissolve the copper from the carbon bed and returnning said copper containing lean cool solution to the absorber.
References Cited (Backward Citations)
US1944122A
Cited
US2377966A
Cited
US2559580A
Cited
US2797188A
Cited
US3568405A
Cited
US4287161A
Cited
US4364915A
Cited
US4477419A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-11-24 | 1990-05-26 | 1990-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-24 | 1994-05-26 | 1994-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-24 | 1998-05-26 | 1998-11-25 | $7700.00 | Window Closed / Lapsed |