US4234548A
Expired / Lapsed
US
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Control of nitrogen oxides from stationary source effluents
Assignee: Nox Research Corp
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Filing: 1978-07-12
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Granted: 1980-11-18
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Expires: 1998-07-12
Abstract
Abstract A scrubbing solution and process of use thereof, for removing nitrogen oxides from gaseous effluents from stationary sources comprising a source of sulfite anion, a basic compound, an organic surface-active agent, and water.
Inventors
- 👤 Laurence K. Burnell
- 👤 James D. Hyde
- 👤 Nicholas P. Kolak
- 👤 Richard E. Gibbs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:25
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/54; B01D53/56
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
86 words
In a process of removing nitrogen oxides from flue gases containing nitrogen oxides, the improvement which comprises contacting the flue gases with a scrubbing solution consisting essentially of: from about 0.01 molar to about 2 molar of an inorganic basic compound; from about 0.05 molar to about 2 molar of a sulfite anion source; from about 5×10 -4 % to about 5% by weight of the solution of a surface-active agent selected from the group consisting of anionic, cationic, nonionic, and ampholytic surface-active agents; and water.
Claim 2
Dependent Claim
86 words
In a process of removing nitrogen oxides from flue gases containing nitrogen oxides, the improvement which comprises contacting the flue gases with a scrubbing solution consisting essentially of: from about 0.01 molar to about 2 molar of an inorganic basic compound; from about 0.05 molar to about 2 molar of a sulfite anion source; from about 5×10 -4 % to about 5% by weight of the solution of a surface-active agent selected from the group consisting of anionic, cationic, nonionic, and ampholytic surface-active agents; and water.
Claim 3
Dependent Claim
24 words
The process of claim 1, wherein the contacting is carried out at a solution temperature of from about 10° C. to about 100° C.
Claim 4
Dependent Claim
21 words
The process of claim 2, wherein the solution is at a temperature of from about 25° C. to about 60° C.
Claim 5
Dependent Claim
43 words
The process of claim 1 wherein the inorganic basic compound is selected from the group consisting of alkali metal hydroxides, alkali metal oxides, alkali metal carbonates, alkaline earth metal hydroxides, alkaline earth metal oxides, alkaline earth metal carbonates, ammonium hydroxide and ammonium carbonate.
Claim 6
Dependent Claim
23 words
The process of claim 1 wherein the sulfite anion source is a sulfite of an alkali metal, alkaline earth metal, magnesium or ammonia.
Claim 7
Dependent Claim
30 words
The method of claim 1 wherein the surface-active agent is selected from the group consisting of dimethyl sulfone; 2,2',2"-nitrilotriethanol; bis[2-(methoxyethoxy)ethyl]ether; 1,2-bis-(2-methoxyethoxy)ethane; sodium dodecylbenzenesulfonate; octanoic acid; dodecylamine perchlorate; and polyoxyethylene alkylphenol.
Claim 8
Dependent Claim
125 words
The process according to claim 1 in which the scrubbing solution consists essentially of from about 0.01 molar to about 2 molar of an inorganic basic compound selected from the group consisting of alkali metal hydroxides, alkali metal oxides, alkali metal carbonates, alkaline earth metal hydroxides, alkaline earth metal oxides, alkaline earth metal carbonates, ammonium hydroxide and ammonium carbonate; from 0.2 molar to about 1 molar of a sulfite anion source selected from the group consisting of an alkali metal, alkaline earth metal, magnesium or ammonia; from about 5×10 -4 % to about 5% by weight of the solution of a surface-active agent selected from the group consisting of dimethyl sulfone; 2,2',2"-nitrilotriethanol; bis[2-(methoxyethoxy)ethyl]ether; 1,2-bis-(2-methoxyethoxy)ethane; sodium dodecylbenzenesulfonate; octanoic acid; dodecylamine perchlorate, and polyoxyethylene alkylphenol; and water.
Claim 9
Dependent Claim
55 words
The process according to claim 7 wherein the basic compound is selected from the group consisting of sodium hydroxide, sodium carbonate, calcium carbonate and ammonium carbonate; the sulfite anion source is sodium sulfite or potassium sulfite; and the surface-active compound is selected from the group consisting of dimethylsulfone; 2,2',2"-nitrilotriethanol; 1,2-bis-(2-methoxyethoxy)ethane; octanoic acid and polyoxyethylene alkylphenol.
Claim 10
Dependent Claim
23 words
The process of claim 8 wherein the contacting is carried out at a solution temperature of from 10° C. to about 100° C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-18 | 1984-05-19 | 1984-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-18 | 1988-05-19 | 1988-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-18 | 1992-05-19 | 1992-11-18 | $7700.00 | Window Closed / Lapsed |