US5160512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas separation process
Assignee: Cleveland State University
•
Filing: 1992-01-13
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Granted: 1992-11-03
•
Expires: 2012-01-13
Abstract
Abstract An improved method for removal of a gas constituent from a gas stream is disclosed employing a composite sorbent material. The gas stream is passed through a bed of solid absorbent particles having a surface liquid deposit which absorbs part of the gas constituent to be removed while further enabling a remaining portion of the gas constituent to be adsorbed.
Inventors
- 👤 Orhan Talu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:50
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; B01D53/025; B01D53/04; B01D2257/00; B01D2257/40; B01D2257/406; B01D2259/00; B01D2259/40; B01D2259/40083; B01D2259/40086; B01D2259/40088; B01D2259/401; B01D2259/41
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
82 words
A method to more effectively remove ammonia from a flowing waste gas stream comprising the steps of: (a) activating a bed of adsorbent particles with steam to form a surface deposit of condensed steam on the adsorbent particles, (b) contacting the activated adsorbent bed with the flowing waste gas stream, (c) absorbing a portion of the ammonia in the condensed steam deposit, and (d) adsorbing a further portion of the ammonia in the adsorbent particles to provide increased sorption capacity during removal.
Claim 2
Independent Claim
82 words
A method to more effectively remove ammonia from a flowing waste gas stream comprising the steps of: (a) activating a bed of adsorbent particles with steam to form a surface deposit of condensed steam on the adsorbent particles, (b) contacting the activated adsorbent bed with the flowing waste gas stream, (c) absorbing a portion of the ammonia in the condensed steam deposit, and (d) adsorbing a further portion of the ammonia in the adsorbent particles to provide increased sorption capacity during removal.
Claim 3
Dependent Claim
18 words
The method of claim 1 wherein the removal is conducted with a static bed of the adsorbent particles.
Claim 4
Dependent Claim
18 words
The method of claim 1 wherein the removal is conducted with a moving bed of the adsorbent particles.
Claim 5
Dependent Claim
14 words
The method of claim 1 wherein the removal is conducted at above atmospheric pressure.
Claim 6
Dependent Claim
13 words
The method of claim 1 wherein the removal is conducted at elevated temperatures.
Claim 7
Dependent Claim
21 words
The method of claim 1 wherein the removal is conducted with multiple beds of the adsorbent particles being operated in series.
Claim 8
Dependent Claim
22 words
The method of claim 1 wherein the removal is conducted with a continuous passage of the gas stream through the adsorbent bed.
Claim 9
Dependent Claim
23 words
The method of claim 1 wherein at least a portion of the absorbed and adsorbed ammonia is subsequently desorbed from the adsorbent bed.
Claim 10
Dependent Claim
14 words
The method of claim 8 wherein desorption is conducted by heating the adsorbent bed.
Claim 11
Dependent Claim
19 words
The method of claim 8 wherein desorption is conducted by contacting the adsorbent bed with a different gas stream.
Claim 12
Independent Claim
119 words
A method to recover ammonia from a waste gas stream comprising the steps of: (a) activating an adsorbent bed of porous carbon particles with steam to form a moisture film on the carbon particles accompanied by liquid adsorption, (b) continuously passing the gas stream through the adsorbent bed at ambient conditions, (c) absorbing a portion of the ammonia in the liquid medium while adsorbing a further portion of the ammonia in the adsorbent particles to provide increased sorption capacity during ammonia removal from the gas stream, and (d) desorbing a portion of the adsorbed and absorbed ammonia from the adsorbent bed with steam to enable ammonia recovery as an aqueous ammonium solution accompanied by reactivation of the adsorbent bed.
Claim 13
Independent Claim
119 words
A method to recover ammonia from a waste gas stream comprising the steps of: (a) activating an adsorbent bed of porous carbon particles with steam to form a moisture film on the carbon particles accompanied by liquid adsorption, (b) continuously passing the gas stream through the adsorbent bed at ambient conditions, (c) absorbing a portion of the ammonia in the liquid medium while adsorbing a further portion of the ammonia in the adsorbent particles to provide increased sorption capacity during ammonia removal from the gas stream, and (d) desorbing a portion of the adsorbed and absorbed ammonia from the adsorbent bed with steam to enable ammonia recovery as an aqueous ammonium solution accompanied by reactivation of the adsorbent bed.
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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) | 1995-11-03 | 1996-05-04 | 1996-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-11-03 | 2000-05-04 | 2000-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-11-03 | 2004-05-04 | 2004-11-03 | $7700.00 | Window Closed / Lapsed |