US4737164A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovering contaminants from gases
Assignee: Seinajoen Kylmakone A Ja T Saikkonen
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Filing: 1987-01-06
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Granted: 1988-04-12
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Expires: 2007-01-06
Abstract
Abstract A process for recovering volatile inorganic and organic impurities from gases using a layer of fibrous activated carbon for adsorbing the impurities while applying an electric voltage, preferably a DC voltage, across the fibrous layer to improve its adsorption capacity, and then desorbing the impurities from the layer by first increasing the temperature of the layer and then passing an inert gas through the activated carbon to desorb the adsorbed impurities.
Inventors
- 👤 Veli Sarkkinen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:23
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/02; B03C3/04; B03C3/14; B03C3/155; B01; B01D; B01D53/00; B01D53/02; B01D53/04; B01D53/32; B01D2253/00; B01D2253/10; B01D2253/102; B01D2257/00; B01D2257/10; B01D2257/102; B01D2257/30; B01D2257/302; B01D2257/70; B01D2257/708; B01D2258/00; B01D2258/01; B01D2259/00; B01D2259/40; B01D2259/40083; B01D2259/40086; B01D2259/40088; B01D2259/40096
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
53 words
A process for recovering volatile impurities from gases which comprises, passing the gas through a layer of fibrous activated carbon acting as an adsorbent for said impurities while applying an electric voltage across said fibrous layer to improve its adsorption capacity and thereafter desorbing said impurities from said layer of fibrous activated carbon.
Claim 2
Dependent Claim
53 words
A process for recovering volatile impurities from gases which comprises, passing the gas through a layer of fibrous activated carbon acting as an adsorbent for said impurities while applying an electric voltage across said fibrous layer to improve its adsorption capacity and thereafter desorbing said impurities from said layer of fibrous activated carbon.
Claim 3
Dependent Claim
18 words
The process of claim 1, wherein the fibrous activated carbon is in the form of carbon fiber cloth.
Claim 4
Dependent Claim
15 words
The process of claim 1, wherein a DC voltage is applied to the activated carbon.
Claim 5
Dependent Claim
13 words
The process of claim 3, wherein the DC voltage is about 200 V.
Claim 6
Dependent Claim
59 words
The process of claim 1 for recovering water-soluble organic solvents from exhaust air, wherein to desorb the solvents, the activated carbon is first heated to increase its temperature, after which an inert gas, selected from the group consisting of nitorgen, argon, carbon dioxide, and deoxygenized flue gas, is passed through the activated carbon to desorb the adsorbed solvent impurities.
Claim 7
Dependent Claim
26 words
The process of claim 5, wherein the activated carbon is heated by applying an AC current with a magnitude of at least 5 A to it.
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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) | 1991-04-12 | 1991-10-12 | 1992-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-12 | 1995-10-12 | 1996-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-12 | 1999-10-12 | 2000-04-12 | $7700.00 | Window Closed / Lapsed |