Patent US4468238A successfully refreshed from Google Patents.
US4468238A
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Process for removing a nitrogen gas from mixture comprising N2 and CO or N2 ' CO2 and CO
Assignee: JFE Steel Corp
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Filing: 1983-07-26
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Granted: 1984-08-28
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Expires: 2003-07-26
Abstract
Abstract Processes for removing N2 from a feed gas comprising CO+N2 or CO, CO2+N2 through PSA by using at least two adsorption columns containing an adsorbent exhibiting selective adsorb property to carbon monoxide which comprises: (i) a step of pressurizing an adsorption column by the feed gas; (ii) a step of introducing the feed gas into the adsorption column, in which step (i) was previously completed, so as to adsorb CO, or CO+CO2 on or in the adsorbent; (iii) a step of connecting the adsorption column, in which step (ii) was previously completed, to the other adsorption column in which step (v) was previously completed, to reduce the pressure in the former adsorption column to one atmosphere or a pressure close to it; (iv) a step of purging nitrogen by passing product gas through the adsorption column; (v) a step of desorbing carbon monoxide adsorbed on or in the adsorbent of the adsorption column, by vacuum pump to recover a product gas; and (vi) a step of a connecting the adsorption column, in which step (v) was previously completed, to the other adsorption column in which step (ii) was previously completed to increase pressure in the former column, periodically switching the flow between or among said adsorption columns so as to repeat the above steps in all the adsorption columns.
Inventors
- 👤 Sigeo Matsui
- 👤 Yogo Tukahara
- 👤 Shigeki Hayashi
- 👤 Masahiko Kumagai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:47
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; B01D53/04; B01D53/047; B01D53/0476; C; C10; C10K; C10K1/00; C10K1/32; C21; C21B; C21B7/00; C21B7/002; B01D2253/00; B01D2253/10; B01D2253/102; B01D2253/106; B01D2253/108; B01D2253/116; B01D2256/00; B01D2256/10; B01D2256/20; B01D2256/22; B01D2257/00; B01D2257/50; B01D2257/502; B01D2257/504; B01D2259/00; B01D2259/40; B01D2259/40011; B01D2259/40013; B01D2259/40015; B01D2259/40028; B01D2259/4003; B01D2259/40035; B01D2259/40037; B01D2259/40043; B01D2259/4005; B01D2259/40052; B01D2259/40058; B01D2259/40062; B01D2259/40064; B01D2259/40066; B01D2259/402; B01D2259/404; C21B2100/00; C21B2100/20; C21B2100/28; C21B2100/282; C21B2100/284; Y; Y02; Y02C; Y02C20/00; Y02C20/40; Y02P; Y02P10/00; Y02P10/10; Y02P10/122; Y02P20/00; Y02P20/151
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
266 words
A process for separating carbon monoxide from a feed gas comprising carbon monoxide and nitrogen through pressure swing adsorption by using at least two adsorption columns containing an adsorbent exhibiting selective adsorb property to carbon monoxide which comprises: (i) a step of pressurizing an adsorption column by the feed gas, in which the step (vi) was previously completed; (ii) a step of introducing the feed gas into the adsorption column, in which step (i) was previously completed, so as to adsorb carbon monoxide on or in the adsorbent until the breakthrough point is reached or until just before that point is reached; (iii) a step of connecting the adsorption column, in which step (ii) was previously completed, to the other adsorption column in which step (v) was previously completed, to reduce the pressure in the former adsorption column to one atmosphere or a pressure close to it, and to increase pressure in the latter adsorption column; (iv) a step of purging nitrogen by passing product gas through the adsorption column, in which step (iii) was previously completed; (v) a step of desorbing carbon monoxide adsorbed on or in the adsorbent of the adsorption column, in which step (iv) was previously completed, by vacuum pump to recover a product gas, and (vi) a step of connecting the adsorption column, in which step (v) was previously completed, to the other adsorption column in which step (ii) was previously completed to increase pressure in the former column, periodically switching the flow between or among said adsorption columns so as to repeat the above steps in all the adsorption columns.
Claim 2
Dependent Claim
266 words
A process for separating carbon monoxide from a feed gas comprising carbon monoxide and nitrogen through pressure swing adsorption by using at least two adsorption columns containing an adsorbent exhibiting selective adsorb property to carbon monoxide which comprises: (i) a step of pressurizing an adsorption column by the feed gas, in which the step (vi) was previously completed; (ii) a step of introducing the feed gas into the adsorption column, in which step (i) was previously completed, so as to adsorb carbon monoxide on or in the adsorbent until the breakthrough point is reached or until just before that point is reached; (iii) a step of connecting the adsorption column, in which step (ii) was previously completed, to the other adsorption column in which step (v) was previously completed, to reduce the pressure in the former adsorption column to one atmosphere or a pressure close to it, and to increase pressure in the latter adsorption column; (iv) a step of purging nitrogen by passing product gas through the adsorption column, in which step (iii) was previously completed; (v) a step of desorbing carbon monoxide adsorbed on or in the adsorbent of the adsorption column, in which step (iv) was previously completed, by vacuum pump to recover a product gas, and (vi) a step of connecting the adsorption column, in which step (v) was previously completed, to the other adsorption column in which step (ii) was previously completed to increase pressure in the former column, periodically switching the flow between or among said adsorption columns so as to repeat the above steps in all the adsorption columns.
Claim 3
Dependent Claim
19 words
The process according to claim 1 wherein the adsorption pressure is in the range of 0.1-3.0 Kg/cm 2 ·G.
Claim 4
Dependent Claim
15 words
The process according to claim 1 wherein depressurization by pressure equalization is countercurrently carried out.
Claim 5
Dependent Claim
15 words
The process according to claim 1 wherein purge by product gas is concurrently carried out.
Claim 6
Dependent Claim
13 words
The process according to claim 1 wherein the evacuation is countercurrently carried out.
Claim 7
Dependent Claim
15 words
The process according to claim 1 wherein pressurization by pressure equalization is concurrently carried out.
Claim 8
Dependent Claim
277 words
A process for separating carbon monoxide and carbon dioxide from a feed gas comprising carbon monoxide, carbon dioxide and nitrogen through pressure swing adsorption by using at least two adsorption columns containing an adsorbent exhibiting selective adsorb property to carbon monoxide and carbon dioxide which comprises: (i) a step of pressurizing an adsorption column by the feed gas, in which the step (vi) was previously completed; (ii) a step of introducing the feed gas into the adsorption column, in which step (i) was previously completed, so as to adsorb carbon monoxide and carbon dioxide adsorbed on or in the adsorbent until the breakthrough point is reached or until just before that point is reached; (iii) a step of connecting the adsorption column, in which step (ii) was previously completed, to the other adsorption column in which step (v) was previously completed, to reduce the pressure in the former adsorption column to one atmosphere or a pressure close to it, and to increase pressure in the latter column; (iv) a step of purging nitrogen by passing product gas through the adsorption column, in which step (iii) was previously completed; (v) a step of desorbing carbon monoxide and carbon dioxide on the adsorbent of the adsorption column, in which step (iv) was previously completed, by vacuum pump to recover a product gas, and (vi) a step of connecting the adsorption column, in which step (v) was previously completed, to the other adsorption column in which step (ii) was previously completed to increase pressure in the former column, periodically switching the flow between or among said adsorption columns so as to repeat the above steps in all the adsorption columns.
Claim 9
Dependent Claim
277 words
A process for separating carbon monoxide and carbon dioxide from a feed gas comprising carbon monoxide, carbon dioxide and nitrogen through pressure swing adsorption by using at least two adsorption columns containing an adsorbent exhibiting selective adsorb property to carbon monoxide and carbon dioxide which comprises: (i) a step of pressurizing an adsorption column by the feed gas, in which the step (vi) was previously completed; (ii) a step of introducing the feed gas into the adsorption column, in which step (i) was previously completed, so as to adsorb carbon monoxide and carbon dioxide adsorbed on or in the adsorbent until the breakthrough point is reached or until just before that point is reached; (iii) a step of connecting the adsorption column, in which step (ii) was previously completed, to the other adsorption column in which step (v) was previously completed, to reduce the pressure in the former adsorption column to one atmosphere or a pressure close to it, and to increase pressure in the latter column; (iv) a step of purging nitrogen by passing product gas through the adsorption column, in which step (iii) was previously completed; (v) a step of desorbing carbon monoxide and carbon dioxide on the adsorbent of the adsorption column, in which step (iv) was previously completed, by vacuum pump to recover a product gas, and (vi) a step of connecting the adsorption column, in which step (v) was previously completed, to the other adsorption column in which step (ii) was previously completed to increase pressure in the former column, periodically switching the flow between or among said adsorption columns so as to repeat the above steps in all the adsorption columns.
Claim 10
Dependent Claim
19 words
The process according to claim 7 wherein the adsorption pressure is in the range of 0.1-3.0 Kg/cm 2 ·G.
Claim 11
Dependent Claim
15 words
The process according to claim 7 wherein depressurization by pressure equalization is countercurrently carried out.
Claim 12
Dependent Claim
15 words
The process according to claim 7 wherein purge by product gas is concurrently carried out.
Claim 13
Dependent Claim
13 words
The process according to claim 7 wherein the evacuation is countercurrently carried out.
Claim 14
Dependent Claim
15 words
The process according to claim 7 wherein pressurization by pressure equalization is concurrently carried out.
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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) | 1987-08-28 | 1988-02-27 | 1988-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-28 | 1992-02-27 | 1992-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-28 | 1996-02-27 | 1996-08-28 | $7700.00 | Window Closed / Lapsed |