Patent US3312827A successfully refreshed from Google Patents.
US4840647A
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Process for treating a gaseous mixture by adsorption
Assignee: LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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Filing: 1988-10-21
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Granted: 1989-06-20
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Expires: 2008-10-21
Abstract
Abstract The adsorption cycle comprises the following stages: (a) an isobaric adsorption stage at a high pressure of the cycle in which the mixture to be treated is admitted into the adsorber through a first end, termed inlet end, of the adsorber, circulates through the adsorber and is withdrawn therefrom by its other end, termed outlet end, the direction of circulation of the mixture being termed cocurrent; (b) a first stage for the cocurrent decompression of the adsorber to a medium pressure of the cycle; (c) a second stage for the countercurrent decompression of the adsorber to a low pressure of the cycle, the gas withdrawn in the course of this stage being the production gas, and (d) a stage for raising the pressure of the adsorber to the high pressure of the cycle. Application in the recovery of carbon dioxide from sources which contain only 10 to 30% thereof.
Inventors
- 👤 Leon Hay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:47
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; B01D53/04; B01D53/047; B01D53/0476; B01D2253/00; B01D2253/10; B01D2253/102; B01D2256/00; B01D2256/22; B01D2257/00; B01D2257/50; B01D2257/504; B01D2258/00; B01D2258/02; B01D2258/025; B01D2259/00; B01D2259/40; B01D2259/40011; B01D2259/40013; B01D2259/40015; B01D2259/4002; B01D2259/40022; B01D2259/40028; B01D2259/4003; B01D2259/40032; B01D2259/40058; B01D2259/40062; B01D2259/40066; B01D2259/40067; B01D2259/402; B01D2259/403; B01D2259/404; Y; Y02; Y02C; Y02C20/00; Y02C20/40
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
271 words
A process for recovering by adsorption at least one preferentially adsorbable constituent of a gaseous feed mixture, said process employing only two adsorbers and comprising the following cycle of operations for each adsorber: (a) an adsorption stage in which the feed mixture is admitted into a first adsorber through an inlet end thereof and comprising an isobaric adsorption sub-stage at a high pressure of the cycle for adsorption of said preferentially adsorbable constituent, the mixture, at least during said isobaric sub-stage, circulating through the first adsorber and being withdrawn therefrom through an outlet end thereof, the direction of circulation of the mixture being termed cocurrent, said isobaric sub-stage being conducted until an adsorption front has reached said outlet end; (b) a first stage for cocurrent decompression of the first absorber to a medium pressure of the cycle; (c) a second stage for countercurrent decompression of the first adsorber to a low pressure of the cycle, the gas withdrawn in the course of this second stage being the production gas containing the desired content of said adsorbable constituent, at least a portion of the gaseous mixture extracted from the first absorber in the course of stage (b) being richer in said adsorbable constituent than said gaseous feed mixture and being recycled to the inlet end of the second adsorber and admixed with said feed mixture during at least a portion of stage (a) of said second adsorber; and (d) a recompression stage to raise the pressure in said first adsorber from said low pressure to an initial pressure of said stage (a) by introduction of gas cocurrently withdrawn from the second adsorber.
Claim 2
Dependent Claim
271 words
A process for recovering by adsorption at least one preferentially adsorbable constituent of a gaseous feed mixture, said process employing only two adsorbers and comprising the following cycle of operations for each adsorber: (a) an adsorption stage in which the feed mixture is admitted into a first adsorber through an inlet end thereof and comprising an isobaric adsorption sub-stage at a high pressure of the cycle for adsorption of said preferentially adsorbable constituent, the mixture, at least during said isobaric sub-stage, circulating through the first adsorber and being withdrawn therefrom through an outlet end thereof, the direction of circulation of the mixture being termed cocurrent, said isobaric sub-stage being conducted until an adsorption front has reached said outlet end; (b) a first stage for cocurrent decompression of the first absorber to a medium pressure of the cycle; (c) a second stage for countercurrent decompression of the first adsorber to a low pressure of the cycle, the gas withdrawn in the course of this second stage being the production gas containing the desired content of said adsorbable constituent, at least a portion of the gaseous mixture extracted from the first absorber in the course of stage (b) being richer in said adsorbable constituent than said gaseous feed mixture and being recycled to the inlet end of the second adsorber and admixed with said feed mixture during at least a portion of stage (a) of said second adsorber; and (d) a recompression stage to raise the pressure in said first adsorber from said low pressure to an initial pressure of said stage (a) by introduction of gas cocurrently withdrawn from the second adsorber.
Claim 3
Dependent Claim
43 words
A process according to claim 1, comprising, between stage (a) and stage (b), a step for balancing pressures in which the adsorber outlet end of said first adsorber is connected to an end of the second adsorber at the beginning of stage (d).
Claim 4
Dependent Claim
27 words
A process according to claim 2, wherein gas issuing from the first adsorber is admitted into the second adsorber in a countercurrent manner during the balancing stage.
Claim 5
Dependent Claim
27 words
A process according to claim 2, wherein gas issuing from the first adsorber is admitted into said second adsorber in a cocurrent manner during the balancing stage.
Claim 6
Dependent Claim
26 words
A process according to claim 2, wherein the mixture to be treated is introduced in a cocurrent manner into said second adsorber during the balancing step.
Claim 7
Dependent Claim
23 words
A process according to claim 2, wherein the stage (b) comprises a cocurrent pumping step, said medium pressure being lower than atmospheric pressure.
Claim 8
Dependent Claim
16 words
A process according to claim 6, wherein the pumping step is continued throughout the stage (b).
Claim 9
Dependent Claim
21 words
A process according to claim 1, characterized in that the high pressure of the cycle is slightly higher than atmospheric pressure.
Claim 10
Dependent Claim
43 words
A process according to claim 1, characterized in that the gaseous mixture is a gas containing 10 to 30% CO 2 , the adsorbent employed being activated charcoal and the production gas having a content of at least about 95% CO 2 .
Claim 11
Dependent Claim
264 words
A process for recovering by adsorption at least one preferentially adsorbable constitutent of a gaseous feed mixture, said process employing only three adsorbers and comprising the following cycle of operations for each adsorber: (a) an adsorption stage in which the feed mixture is admitted into the adsorber through an inlet end thereof and comprising an isobaric adsorption sub-stage at a high pressure of the cycle for absorption of said preferentially adsorbable constituent, the mixture, at least during said isobaric sub-stage, circulating through the adsorber and being withdrawn therefrom through an outlet end thereof, the direction of circulation of the mixture being termed cocurrent, said isobaric sub-stage being conducted until an adsorption front has reached said outlet end; (b) a first stage for cocurrent decompression of the adsorber to a medium presure of the cycle; (c) a second stage for countercurrent decompression of the adsorber to a low pressure of the cycle, the gas withdrawn in the course of this second stage being the production gas containing the desired content of said adsorbable constituent, at least a portion of the gaseous mixture extracted from the absorber in the course of stage (b) being richer in said adsorbable constituent than said gaseous feed mixture and being recycled to the inlet end of another adsorber and admixed with said feed mixture during at least one part of the stage (a) of said other absorber; and (d) a recompression stage to raise the pressure in said adsorber from said low pressure to an initial pressure of said stage (a) by introduction of gas cocurrently withdrawn from another adsorber.
Claim 12
Dependent Claim
264 words
A process for recovering by adsorption at least one preferentially adsorbable constitutent of a gaseous feed mixture, said process employing only three adsorbers and comprising the following cycle of operations for each adsorber: (a) an adsorption stage in which the feed mixture is admitted into the adsorber through an inlet end thereof and comprising an isobaric adsorption sub-stage at a high pressure of the cycle for absorption of said preferentially adsorbable constituent, the mixture, at least during said isobaric sub-stage, circulating through the adsorber and being withdrawn therefrom through an outlet end thereof, the direction of circulation of the mixture being termed cocurrent, said isobaric sub-stage being conducted until an adsorption front has reached said outlet end; (b) a first stage for cocurrent decompression of the adsorber to a medium presure of the cycle; (c) a second stage for countercurrent decompression of the adsorber to a low pressure of the cycle, the gas withdrawn in the course of this second stage being the production gas containing the desired content of said adsorbable constituent, at least a portion of the gaseous mixture extracted from the absorber in the course of stage (b) being richer in said adsorbable constituent than said gaseous feed mixture and being recycled to the inlet end of another adsorber and admixed with said feed mixture during at least one part of the stage (a) of said other absorber; and (d) a recompression stage to raise the pressure in said adsorber from said low pressure to an initial pressure of said stage (a) by introduction of gas cocurrently withdrawn from another adsorber.
Claim 13
Dependent Claim
38 words
A process according to claim 10, comprising, between stage (a) and stage (b), a step for balancing pressures in which the adsorber outlet end is connected to an end of another adsorber at the beginning of stage (d).
Claim 14
Dependent Claim
26 words
A process according to claim 10, wherein the mixture to be treated is introduced in a cocurrent manner into said other adsorber during the balancing step.
Claim 15
Dependent Claim
23 words
A process according to claim 10, wherein the stage (b) comprises a cocurrent pumping step, said medium pressure being lower than atmospheric pressure.
Claim 16
Dependent Claim
255 words
A process for recovering by adsorption at least one preferentially adsorbable constituent of a gaseous feed mixture, said process employing only four adsorbers and comprising the following cycle of operations for each adsorber: (a) an adsorption stage in which the feed mixture is admitted into the adsorber through an inlet end thereof and comprising an isobaric adsorption sub-stage at a high pressure of the cycle for adsorption of said preferentially adsorbable constituent, the mixture, at least during said isobaric sub-stage, circulating through the adsorber and being withdrawn therefrom through an outlet end thereof, the direction of circulation of the mixture being termed cocurrent, said isobaric sub-stage being conducted until an adsorption front has reached said outlet end; (b) a first stage for a cocurrent decompression of the adsorber to a medium pressure of the cycle; (c) a second stage for countercurrent decompression of the adsorber to a low pressure of the cycle, the gas withdrawn in the course of this second stage being the production gas containing the desired content of said adsorbable constituent, at least a portion of the gaseous mixture to be treated in said adsorption stage (a) being successively (i) said gaseous feed mixture, (ii) gas extracted from another adsorber in stage (b), mixed with said gaseous mixture, and (iii) gas extracted from said other adsorber in stage (b); and (d) a recompression stage to raise the pressure in said adsorber from said low pressure to an initial pressure of said stage (a) by introduction of gas cocurrently withdrawn from another adsorber.
Claim 17
Dependent Claim
255 words
A process for recovering by adsorption at least one preferentially adsorbable constituent of a gaseous feed mixture, said process employing only four adsorbers and comprising the following cycle of operations for each adsorber: (a) an adsorption stage in which the feed mixture is admitted into the adsorber through an inlet end thereof and comprising an isobaric adsorption sub-stage at a high pressure of the cycle for adsorption of said preferentially adsorbable constituent, the mixture, at least during said isobaric sub-stage, circulating through the adsorber and being withdrawn therefrom through an outlet end thereof, the direction of circulation of the mixture being termed cocurrent, said isobaric sub-stage being conducted until an adsorption front has reached said outlet end; (b) a first stage for a cocurrent decompression of the adsorber to a medium pressure of the cycle; (c) a second stage for countercurrent decompression of the adsorber to a low pressure of the cycle, the gas withdrawn in the course of this second stage being the production gas containing the desired content of said adsorbable constituent, at least a portion of the gaseous mixture to be treated in said adsorption stage (a) being successively (i) said gaseous feed mixture, (ii) gas extracted from another adsorber in stage (b), mixed with said gaseous mixture, and (iii) gas extracted from said other adsorber in stage (b); and (d) a recompression stage to raise the pressure in said adsorber from said low pressure to an initial pressure of said stage (a) by introduction of gas cocurrently withdrawn from another adsorber.
Claim 18
Dependent Claim
57 words
A process according to claim 14, wherein stage (b) comprises an initial step for balancing pressures between a first adsorber subjected to said first sub-stage and another adsorber in stage (b), and said first sub-stage comprises said balancing step, then, solely, countercurrent admission into said first adsorber of gas issuing from still another adsorber in stage (a).
Claim 19
Dependent Claim
21 words
A process according to claim 14, characterized in that the high pressure of the cycle is slightly higher than atmospheric pressure.
Claim 20
Dependent Claim
43 words
A process according to claim 14, characterized in that the gaseous mixture is a gas containing 10 to 30% CO 2 , the adsorbent employed being activated charcoal and the production gas having a content of at least about 95% CO 2 .
Claim 21
Dependent Claim
264 words
A process for recovering by adsorption at least one preferentially adsorbable constituent of a gaseous feed mixture, said process employing a plurality of adsorbers and comprising the following cycle of operations for each adsorber: (a) an adsorption stage in which the feed mixture is admitted into the adsorber through an inlet end thereof and comprising an isobaric adsorption sub-stage at a high pressure of the cycle for adsorption of said preferentially adsorbable constituent, the mixture, at least during said isobaric sub-stage, circulating through the adsorber and being withdrawn therefrom through an outlet end thereof, the direction of circulation of the mixture being termed cocurrent, said isobaric sub-stage being conducted until an adsorption front has reached said outlet end; (b) a first stage for a cocurrent decompression of the adsorber to a medium pressure of the cycle; (c) a second stage for countercurrent decompression of the adsorber to a low pressure of the cycle, the gas withdrawn in the course of the second stage being the production gas containing the desired content of said adsorbable constituent, at least a portion of the gaseous mixture extracted from the adsorber in the course of stage (b) being richer iin said adsorbable constituent than said gaseous feed mixture and being recycled to the inlet end of another adsorber and admixed with said feed mixture during at least a portion of stage (a) of said other adsorber; and (d) a recompression stage to raise the pressure in said adsorber from said low pressure to an initial pressure of stage (a) by means of gas cocurrently withdrawn from another adsorber.
Claim 22
Dependent Claim
264 words
A process for recovering by adsorption at least one preferentially adsorbable constituent of a gaseous feed mixture, said process employing a plurality of adsorbers and comprising the following cycle of operations for each adsorber: (a) an adsorption stage in which the feed mixture is admitted into the adsorber through an inlet end thereof and comprising an isobaric adsorption sub-stage at a high pressure of the cycle for adsorption of said preferentially adsorbable constituent, the mixture, at least during said isobaric sub-stage, circulating through the adsorber and being withdrawn therefrom through an outlet end thereof, the direction of circulation of the mixture being termed cocurrent, said isobaric sub-stage being conducted until an adsorption front has reached said outlet end; (b) a first stage for a cocurrent decompression of the adsorber to a medium pressure of the cycle; (c) a second stage for countercurrent decompression of the adsorber to a low pressure of the cycle, the gas withdrawn in the course of the second stage being the production gas containing the desired content of said adsorbable constituent, at least a portion of the gaseous mixture extracted from the adsorber in the course of stage (b) being richer iin said adsorbable constituent than said gaseous feed mixture and being recycled to the inlet end of another adsorber and admixed with said feed mixture during at least a portion of stage (a) of said other adsorber; and (d) a recompression stage to raise the pressure in said adsorber from said low pressure to an initial pressure of stage (a) by means of gas cocurrently withdrawn from another adsorber.
Claim 23
Dependent Claim
42 words
A process according to claim 18, comprising, between stage (a) and stage (b), a step for balancing pressures in which the adsorber outlet end of a first adsorber is connected to an end of another adsorber at the beginning of stage (d).
Claim 24
Dependent Claim
27 words
A process according to claim 19, wherein gas issuing from said first adsorber is admitted into said another adsorber in a countercurrent manner during the balancing stage.
Claim 25
Dependent Claim
23 words
A process according to claim 19, wherein gas issuing from said first adsorber is admitted into said another adsorber in a cocurrent manner.
Claim 26
Dependent Claim
26 words
A process according to claim 19, wherein the mixture to be treated is introduced into a cocurrent manner into said another adsorber during the balancing stage.
Claim 27
Dependent Claim
23 words
A process according to claim 19, wherein the stage (b) comprises a cocurrent pumping stage, said medium pressure being lower than atmospheric pressure.
Claim 28
Dependent Claim
16 words
A process according to claim 23, wherein the pumping step is continued throughout the stage (b).
Claim 29
Dependent Claim
19 words
A process according to claim 18, wherein the high pressure of the cycle is slightly higher than atmospheric pressure.
Claim 30
Dependent Claim
41 words
A process according to claim 18, wherein the gaseous mixture is a gas containing 10 to 30% CO 2 , the adsorbent employed being activated charcoal and the production gas having a content of at least about 95% CO 2 .
References Cited (Backward Citations)
US3085379A
Cited
US3176444A
Cited
US3338030A
Cited
US3430418A
Cited
US3638398A
Cited
US3564816A
Cited
US3636679A
Cited
US3788037A
Cited
US3738087A
Cited
US3751878A
Cited
FR2270927A1
Cited
US4077779A
Cited
EP0083832A1
Cited
US4581044A
Cited
EP0108005A1
Cited
US4512779A
Cited
US4512780A
Cited
US4578089A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-19 | 1992-12-19 | 1993-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-19 | 1996-12-19 | 1997-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-19 | 2000-12-19 | 2001-06-20 | $7700.00 | Window Closed / Lapsed |