US4803059A
Expired / Lapsed
US
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Process for the reduction of nitrogen oxides in an effluent using a hydroxy amino hydrocarbon
Assignee: Fuel Tech Inc
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Filing: 1987-04-15
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Granted: 1989-02-07
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Expires: 2007-04-15
Abstract
Abstract A process for the reduction of the concentration of nitrogen oxides is in effluent from the combustion of a carbonaceous fuel is presented. The process comprises injecting a treatment agent comprising a hydroxy amino hydrocarbon into an effluent at an effluent temperature of greater than about 1300 DEG F. under conditions effective to reduce the concentration of nitrogen oxides in the effluent.
Inventors
- 👤 James C. Sullivan
- 👤 William R. Epperly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:05
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/54; B01D53/56
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
59 words
A process for the reduction of the concentration of nitrogen oxides in an effluent from the combustion of a carbonaceous fuel, the process comprising injecting a treatment agent comprising a hydroxy amino hydrocarbon into an effluent at an effluent temperature of greater than about 1300° F. under conditions effective to reduce the concentration of nitrogen oxides in the effluent.
Claim 2
Dependent Claim
59 words
A process for the reduction of the concentration of nitrogen oxides in an effluent from the combustion of a carbonaceous fuel, the process comprising injecting a treatment agent comprising a hydroxy amino hydrocarbon into an effluent at an effluent temperature of greater than about 1300° F. under conditions effective to reduce the concentration of nitrogen oxides in the effluent.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein the effluent temperature is greater than about 1450° F.
Claim 4
Dependent Claim
25 words
The process of claim 1 wherein said hydroxy amino hydrocarbon is selected from the group consisting of alkanolamines, amino acids, protein-containing compositions and mixtures thereof.
Claim 5
Dependent Claim
12 words
The process of claim 3 wherein said hydroxy amino hydrocarbon comprises glycine.
Claim 6
Dependent Claim
36 words
The process of claim 1 wherein said treatment agent is injected into said effluent at a molar ratio of nitrogen in said treatment agent to the baseline nitrogen oxides level of about 1:5 to about 10:1.
Claim 7
Dependent Claim
28 words
The process of claim 5 wherein the molar ratio of the nitrogen in said treatment agent to the baseline nitrogen oxides level is about 1:3 to about 5:1.
Claim 8
Dependent Claim
36 words
The process of claim 6 wherein said treatment agent is injected into the effluent at a molar ratio of nitrogen in said treatment agent to the baseline nitrogen oxides level of about 1:2 to about 3:1.
Claim 9
Dependent Claim
13 words
The process of claim 1 wherein said treatment agent comprises an aqueous mixture.
Claim 10
Dependent Claim
12 words
The process of claim 1 wherein said treatment agent further comprises urea.
Claim 11
Dependent Claim
60 words
A process for reducing the concentration of nitrogen oxides in an effluent from the combustion of a carbonaceous fuel, the process comprising injecting a treatment agent which comprises urea and a hydroxy amino hydrocarbon into an effluent at an effluent temperature of greater than about 1300° F. under conditions effective to reduce the concentration of nitrogen oxides in the effluent.
Claim 12
Dependent Claim
60 words
A process for reducing the concentration of nitrogen oxides in an effluent from the combustion of a carbonaceous fuel, the process comprising injecting a treatment agent which comprises urea and a hydroxy amino hydrocarbon into an effluent at an effluent temperature of greater than about 1300° F. under conditions effective to reduce the concentration of nitrogen oxides in the effluent.
Claim 13
Dependent Claim
15 words
The process of claim 10 wherein the effluent temperature is greater than about 1450° F.
Claim 14
Dependent Claim
25 words
The process of claim 11 wherein said hydroxy amino hydrocarbon is selected from the group consisting of alkanolamines, amino acids, protein-containing compositions and mixtures thereof.
Claim 15
Dependent Claim
12 words
The process of claim 12 wherein said hydroxy amino hydrocarbon comprises glycine.
Claim 16
Dependent Claim
13 words
The process of claim 11 wherein said treatment agent comprises an aqueous mixture.
Claim 17
Dependent Claim
36 words
The process of claim 11 wherein said treatment agent is injected into the effluent at a molar ratio of nitrogen in said treatment agent to the baseline nitrogen oxides level of about 1:5 to about 10:1.
Claim 18
Dependent Claim
27 words
The process of claim 15 wherein the molar ratio of nitrogen in said treatment agent to the baseline nitrogen oxides level is about 1:3 to about 5:1.
Claim 19
Dependent Claim
27 words
The process of claim 16 wherein the molar ratio of nitrogen in said treatment agent to the baseline nitrogen oxides level is about 1:2 to about 3:1.
Claim 20
Dependent Claim
106 words
A process for the reduction of the concentration of nitrogen oxides in an effluent from the combustion of a carbonaceous fuel, the process comprising: a. providing a treatment agent comprising urea and a hydroxy amino hydrocarbon at a weight ratio of hydroxy amino hydrocarbon to urea of about 1:10 to about 4:1; b. injecting said treatment agent into an effluent at an effluent temperature of greater than about 1450° F. and at a molar ratio of nitrogen in said treatment agent to the baseline nitrogen oxides level of about 1:5 to about 10:1; under conditions effective to reduce the concentration of nitrogen oxides in the effluent.
Claim 21
Dependent Claim
106 words
A process for the reduction of the concentration of nitrogen oxides in an effluent from the combustion of a carbonaceous fuel, the process comprising: a. providing a treatment agent comprising urea and a hydroxy amino hydrocarbon at a weight ratio of hydroxy amino hydrocarbon to urea of about 1:10 to about 4:1; b. injecting said treatment agent into an effluent at an effluent temperature of greater than about 1450° F. and at a molar ratio of nitrogen in said treatment agent to the baseline nitrogen oxides level of about 1:5 to about 10:1; under conditions effective to reduce the concentration of nitrogen oxides in the effluent.
Claim 22
Dependent Claim
77 words
A process for the reduction of the concentration of nitrogen oxides in an effluent from the combustion of a carbonaceous fuel, the process comprising injecting a treatment agent comprising urea and a hydroxy amino hydrocarbon into an effluent at an effluent temperature of greater than about 1300° F. and a weight ratio of hydroxy amino hydrocarbon to urea of about 1:10 to about 4:1, under conditions effective to reduce the concentration of nitrogen oxides in the effluent.
Claim 23
Dependent Claim
77 words
A process for the reduction of the concentration of nitrogen oxides in an effluent from the combustion of a carbonaceous fuel, the process comprising injecting a treatment agent comprising urea and a hydroxy amino hydrocarbon into an effluent at an effluent temperature of greater than about 1300° F. and a weight ratio of hydroxy amino hydrocarbon to urea of about 1:10 to about 4:1, under conditions effective to reduce the concentration of nitrogen oxides in the effluent.
Claim 24
Dependent Claim
69 words
A process for the reduction of the concentration of nitrogen oxides in an effluent from the combustion of a carbonaceous fuel, the process comprising injecting a treatment agent comprising a hydroxy amino hydrocarbon and about 2% to about 60% by weight of urea into an effluent at an effluent temperature of greater than about 1450° F. under conditions effective to reduce the concentration of nitrogen oxides in the effluent.
Claim 25
Dependent Claim
69 words
A process for the reduction of the concentration of nitrogen oxides in an effluent from the combustion of a carbonaceous fuel, the process comprising injecting a treatment agent comprising a hydroxy amino hydrocarbon and about 2% to about 60% by weight of urea into an effluent at an effluent temperature of greater than about 1450° F. under conditions effective to reduce the concentration of nitrogen oxides in the effluent.
Claim 26
Dependent Claim
28 words
The process of claim 20 wherein said treatment agent comprises an aqueous mixture comprising a hydroxy amino hydrocarbon and about 2% to about 60% by weight of urea.
Claim 27
Dependent Claim
69 words
A process for the reduction of the concentration of nitrogen oxides in an effluent from the combustion of a carbonaceous fuel, the process comprising injecting a treatment agent comprising urea and about 0.5% to about 25% by weight of a hydroxy amino hydrocarbon into an effluent at an effluent temperature of greater than about 1450° F. under conditions effective to reduce the concentration of nitrogen oxides in the effluent.
Claim 28
Dependent Claim
69 words
A process for the reduction of the concentration of nitrogen oxides in an effluent from the combustion of a carbonaceous fuel, the process comprising injecting a treatment agent comprising urea and about 0.5% to about 25% by weight of a hydroxy amino hydrocarbon into an effluent at an effluent temperature of greater than about 1450° F. under conditions effective to reduce the concentration of nitrogen oxides in the effluent.
Claim 29
Dependent Claim
28 words
The process of claim 22 wherein said treatment agent comprises an aqueous mixture comprising urea and about 0.5% to about 25% by weight of a hydroxy amino hydrocarbon.
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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) | 1992-02-07 | 1992-08-08 | 1993-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-07 | 1996-08-08 | 1997-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-07 | 2000-08-08 | 2001-02-07 | $7700.00 | Window Closed / Lapsed |