US4711646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single component adsorption process
Assignee: Praxair Technology Inc
•
Filing: 1987-03-26
•
Granted: 1987-12-08
•
Expires: 2007-03-26
Abstract
Abstract A process to adbsorb a single component from a gaseous stream comprising passing the gaseous stream sequentially in contact with separate and distinct adsorbent masses wherein not all of the component is removed in a single adsorbent mass. The process exhibits improved overall efficiency over conventional single component processes.
Inventors
- 👤 Arun Acharya
- 👤 William E. BeVier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:45
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; B01D53/04; B01D53/047; B01D53/06; B01D53/08; B01D2259/00; B01D2259/40; B01D2259/404
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
154 words
A process for the removal by adsorption of a single component from a gaseous stream comprising: (a) passing a gaseous stream containing a component to be removed in contact with a first mass of adsorbent to transfer the majority of said component to the first mass of adsorbent and reduce the concentration of said component in the gaseous stream to within the range of from 5 to 50 ppm; (b) passing the resulting gaseous stream in contact with a second mass of adsorbent, separate from the first mass of adsorbent, to transfer remaining component to the second mass of adsorbent and reduce the concentration of said component in the gaseous stream to less than 5 ppm; (c) loading each of the adsorbent masses to at least 90 percent of its capacity; (d) regenerating the first adsorbent mass to a high residual loading; and (e) regenerating the second adsorbent mass to a low residual loading.
Claim 2
Dependent Claim
154 words
A process for the removal by adsorption of a single component from a gaseous stream comprising: (a) passing a gaseous stream containing a component to be removed in contact with a first mass of adsorbent to transfer the majority of said component to the first mass of adsorbent and reduce the concentration of said component in the gaseous stream to within the range of from 5 to 50 ppm; (b) passing the resulting gaseous stream in contact with a second mass of adsorbent, separate from the first mass of adsorbent, to transfer remaining component to the second mass of adsorbent and reduce the concentration of said component in the gaseous stream to less than 5 ppm; (c) loading each of the adsorbent masses to at least 90 percent of its capacity; (d) regenerating the first adsorbent mass to a high residual loading; and (e) regenerating the second adsorbent mass to a low residual loading.
Claim 3
Dependent Claim
29 words
The process of claim 1 wherein the component concentration in the gaseous stream after the first mass of adsorbent is within the range of from 5 to 20 ppm.
Claim 4
Dependent Claim
24 words
The process of claim 1 wherein the component concentration in the gaseous stream after the second mass of adsorbent is less than 2 ppm.
Claim 5
Dependent Claim
25 words
The process of claim 1 wherein at least one of the first and second mass of adsorbent contacts the gaseous stream in a fixed bed.
Claim 6
Dependent Claim
25 words
The process of claim 1 wherein at least one of the first and second mass of adsorbent contacts the gaseous stream in a moving bed.
Claim 7
Dependent Claim
14 words
The process of claim 5 wherein the contact in the moving bed is cocurrent.
Claim 8
Dependent Claim
14 words
The process of claim 5 wherein the contact in the moving bed is countercurrent.
Claim 9
Dependent Claim
19 words
The process of claim 1 wherein the first and second mass of adsorbent are the same type of adsorbent.
Claim 10
Dependent Claim
18 words
The process of claim 1 wherein the first and second mass of adsorbent are different types of adsorbent.
Claim 11
Dependent Claim
15 words
The process of claim 1 wherein at least one mass of adsorbent is molecular sieve.
Claim 12
Dependent Claim
19 words
The process of claim 1 wherein the gaseous stream is air and the component to be removed is water.
Claim 13
Dependent Claim
23 words
The process of claim 1 wherein at least one of the regenerations is carried out by changing the pressure on the adsorbent mass.
Claim 14
Dependent Claim
23 words
The process of claim 1 wherein at least one of the regenerations is carried out by changing the temperature of the adsorbent mass.
Claim 15
Dependent Claim
26 words
The process of claim 1 wherein at least one of the regenerations is carried out by contacting purge gas in countercurrent flow with the adsorbent mass.
Claim 16
Dependent Claim
21 words
The process of claim 14 wherein both regenerations are carried out by contacting purge gas in countercurrent flow with adsorbent mass.
Claim 17
Dependent Claim
42 words
The process of claim 15 wherein at least a part of the purge gas after regeneration of the second adsorbent mass is employed to make up at least part of the purge gas requirement for the regeneration of the first adsorbent mass.
Claim 18
Dependent Claim
75 words
The process of claim 1 wherein the ratio of the component concentration in the gaseous stream prior to contacting the first adsorbent mass to the component concentration in the gaseous stream after contacting the first adsorbent mass is within a factor of five of the ratio of the component concentration in the gaseous stream prior to contacting the second adsorbent mass to the component concentration in the gaseous stream after contacting the second adsorbent mass.
Claim 19
Dependent Claim
18 words
The process of claim 1 wherein the high residual loading is at least twice the low residual loading.
Claim 20
Dependent Claim
74 words
The process of claim 1 wherein the adsorbent is molecular sieve, the gaseous stream is air and the component to be removed is water, and wherein the first adsorbent mass is regenerated to a high residual loading of at least 12 pounds of water per 100 pounds of adsorbent and the second adsorbent mass is regenerated to a low residual loading of not more than 6 pounds of water per 100 pounds of adsorbent.
Claim 21
Dependent Claim
19 words
The process of claim 1 wherein each adsorbent mass is loaded to at least 95 percent of its capacity.
References Cited (Backward Citations)
US2340390A
Cited
US3155468A
Cited
US2944627A
Cited
US3006438A
Cited
US2918140A
Cited
US3359707A
Cited
US3252268A
Cited
US3944400A
Cited
US4299596A
Cited
US4249915A
Cited
US4376640A
Cited
US4376639A
Cited
US4526877A
Cited
US4627856A
Cited
US4511375A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-12-07 | 1991-06-08 | 1991-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-07 | 1995-06-08 | 1995-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-07 | 1999-06-08 | 1999-12-08 | $7700.00 | Window Closed / Lapsed |