Patent US4822577A successfully refreshed from Google Patents.
US4822577A
Expired / Lapsed
US
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Method for the reduction of sulfur trioxide in an effluent
Assignee: Fuel Tech Inc
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Filing: 1988-07-14
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Granted: 1989-04-18
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Expires: 2008-07-14
Abstract
Abstract A method is presented for the selective gas-phase reduction of sulfur trioxide in the effluent from the combustion of a carbonaceous fuel, the method comprising introducing a treatment agent comprising hydrogen peroxide or an oxygenated hydrocarbon having at least two carbon atoms into the effluent at an effluent temperature of no greater than about 1450° F.
Inventors
- 👤 William R. Epperly
- 👤 James C. Sullivan
- 👤 Barry N. Sprague
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:21
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/60; B01D53/48; B01D53/50; B01D53/507; Y; Y02; Y02A; Y02A50/00; Y02A50/20
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
55 words
A method for the selective reduction of sulfur trioxide in the effluent from the combustion of a carbonaceous fuel, the method comprising introducing a treatment agent comprising hydrogen peroxide or an oxygenated hydrocarbon having at least two carbon atoms into the effluent at an effluent temperature of between about 1000° F. and about 1450° F.
Claim 2
Independent Claim
55 words
A method for the selective reduction of sulfur trioxide in the effluent from the combustion of a carbonaceous fuel, the method comprising introducing a treatment agent comprising hydrogen peroxide or an oxygenated hydrocarbon having at least two carbon atoms into the effluent at an effluent temperature of between about 1000° F. and about 1450° F.
Claim 3
Dependent Claim
30 words
The method of claim 1 wherein said oxygenated hydrocarbon is selected from the group consisting of alcohols, sugars, lignin derivatives, carboxylic acids, peroxides, aldehydes, ethers, esters, ketones, and mixtures thereof.
Claim 4
Dependent Claim
30 words
The method of claim 2 wherein said oxygenated hydrocarbon is selected from the group consisting of ethylene glycol, molasses, glycerin, tetrahydrofuran, acetone, ammonium acetate, citric acid, sucrose, and mixtures thereof.
Claim 5
Dependent Claim
18 words
The method of claim 1 wherein the effluent temperature is between about 1100° F. and about 1350° F.
Claim 6
Dependent Claim
25 words
The method of claim 1 wherein the weight ratio of said oxygenated hydrocarbon to sulfur trioxide in the effluent is about 3:1 to about 8:1.
Claim 7
Dependent Claim
13 words
The method of claim 1 wherein said treatment agent comprises an aqueous dispersion.
Claim 8
Dependent Claim
25 words
The method of claim 6 wherein said oxygenated hydrocarbon is present in said dispersion in an amount of about 1% to about 25% by weight.
Claim 9
Dependent Claim
17 words
The method of claim 1 wherein the pollutant being reduced comprises both nitrogen oxides and sulfur trioxide.
Claim 10
Independent Claim
62 words
A method for the reduction of nitrogen oxides while concommitantly reducing the concentration of sulfur trioxide in the effluent from the combustion of a carbonaceous fuel, the method comprising introducing into the effluent a treatment agent comprising hydrogen peroxide or an oxygenated hydrocarbon having at least two carbon atoms at an effluent temperature of between about 1000° F. and about 1450° F.
Claim 11
Independent Claim
62 words
A method for the reduction of nitrogen oxides while concommitantly reducing the concentration of sulfur trioxide in the effluent from the combustion of a carbonaceous fuel, the method comprising introducing into the effluent a treatment agent comprising hydrogen peroxide or an oxygenated hydrocarbon having at least two carbon atoms at an effluent temperature of between about 1000° F. and about 1450° F.
Claim 12
Dependent Claim
30 words
The method of claim 9 wherein said oxygenated hydrocarbon is selected from the group consisting of alcohols, sugars, lignin derivatives, carboxylic acids, peroxides, aldehydes, ethers, esters, ketones, and mixtures thereof.
Claim 13
Dependent Claim
30 words
The method of claim 10 wherein said oxygenated hydrocarbon is selected from the group consisting of ethylene glycol, molasses, glycerin, tetrahydrofuran, ammonium acetate, citric acid, acetone, sucrose, and mixtures thereof.
Claim 14
Dependent Claim
18 words
The method of claim 9 wherein the effluent temperature is between about 1100° F. and about 1300° F.
Claim 15
Dependent Claim
25 words
The method of claim 9 wherein the weight ratio of said oxygenated hydrocarbon to sulfur trioxide in the effluent is about 3:1 to about 8:1.
Claim 16
Dependent Claim
13 words
The method of claim 9 wherein said treatment agent comprises an aqueous dispersion.
Claim 17
Dependent Claim
25 words
The method of claim 14 wherein said oxygenated hydrocarbon is present in said dispersion in an amount of about 1% to about 25% by weight.
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1992-04-17 | 1992-10-17 | 1993-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-17 | 1996-10-17 | 1997-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-17 | 2000-10-17 | 2001-04-18 | $7700.00 | Window Closed / Lapsed |