Patent US6371809B1 successfully refreshed from Google Patents.
US4238461A
Expired / Lapsed
US
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Removal of odors from gas streams
Assignee: Quad Environmental Technologies Corp
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Filing: 1979-09-28
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Granted: 1980-12-09
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Expires: 1999-09-28
Abstract
Abstract Odoriferous constituents are removed from relatively dry and/or warm gas streams by contacting the gas with a very finely divided aqueous spray containing a reagent reactive toward the odoriferous constituents of the gas. Droplet size of the aqueous spray is controlled as a function of temperature and relative humidity of the gas stream so as to prevent complete evaporation of liquid droplets and to achieve a maximum droplet size after evaporation of about ten microns.
Inventors
- 👤 Egbert deVries
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:27
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; Y; Y10; Y10S; Y10S261/00; Y10S261/34
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
177 words
A method for removing odoriferous constituents from a relatively dry waste gas stream which comprises: passing the waste gas into an upper level of a treatment zone; introducing into the gas stream at a point at or near its entry into the treatment zone a finely divided spray comprising an aqueous solution of a chemical reagent reactive toward said odoriferous constituents; adjusting the droplet size and volume of said spray according to the temperature and relative humidity of said gas stream to produce upon equilibrium of the gas and spray residual liquid droplets having a maximum diameter of about 10 microns and having a residual liquid volume ranging from about 0.01 to about 1.0 gallons per thousand cubic feet of gas; allowing the droplets to fall unimpeded through the treatment zone for at least about 3 seconds; removing a treated gas stream from a lower level of the treatment zone, and separately removing settled out spray liquid, now containing the reaction products of said chemical reagent and odoriferous gas constituents, from the bottom of the treatment zone.
Claim 2
Independent Claim
177 words
A method for removing odoriferous constituents from a relatively dry waste gas stream which comprises: passing the waste gas into an upper level of a treatment zone; introducing into the gas stream at a point at or near its entry into the treatment zone a finely divided spray comprising an aqueous solution of a chemical reagent reactive toward said odoriferous constituents; adjusting the droplet size and volume of said spray according to the temperature and relative humidity of said gas stream to produce upon equilibrium of the gas and spray residual liquid droplets having a maximum diameter of about 10 microns and having a residual liquid volume ranging from about 0.01 to about 1.0 gallons per thousand cubic feet of gas; allowing the droplets to fall unimpeded through the treatment zone for at least about 3 seconds; removing a treated gas stream from a lower level of the treatment zone, and separately removing settled out spray liquid, now containing the reaction products of said chemical reagent and odoriferous gas constituents, from the bottom of the treatment zone.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein the reactive chemical reagent is selected from the group consisting of oxidizing agents, acids and bases.
Claim 4
Dependent Claim
13 words
The method of claim 2 wherein the chemical reagent is an oxidizing agent.
Claim 5
Dependent Claim
12 words
The method of claim 3 wherein the oxidizing agent is sodium hypochlorite.
Claim 6
Dependent Claim
23 words
The method of claim 1 wherein the residual liquid volume ranges from about 0.01 to 0.1 gallon per thousand cubic feet of gas.
Claim 7
Dependent Claim
13 words
The method of claim 5 wherein the reactive chemical reagent is sodium hypochlorite.
Claim 8
Dependent Claim
23 words
The method of claim 6 wherein the concentration of said sodium hypochlorite in the liquid spray ranges from about 100 to 500 ppm.
Claim 9
Dependent Claim
21 words
The method of claim 5 wherein the fall time of droplets in the treating zone is in excess of 10 seconds.
References Cited (Backward Citations)
GB1333635A
Cited
US4125589A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-09 | 1984-06-09 | 1984-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-09 | 1988-06-09 | 1988-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-09 | 1992-06-09 | 1992-12-09 | $7700.00 | Window Closed / Lapsed |