US4110183A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for denitration of exhaust gas
Assignee: Kobe Steel Ltd
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Filing: 1977-07-29
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Granted: 1978-08-29
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Expires: 1997-07-29
Abstract
Abstract A process for removing nitrogen oxides from exhaust gases which comprises; Introducing an oxidizing gas into the exhaust gas to oxidize the nitrogen monoxide contained therein to nitrogen dioxide and thereby form a first oxidized exhaust gas; Irradiating said first oxidized gas with actinic light to oxidize said nitrogen dioxide to nitric acid and thereby form a second oxidized exhaust gas; and Removing said nitric acid from said second oxidized exhaust gas.
Inventors
- 👤 Isao Furuta
- 👤 Yoshimi Takiguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:58
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/20; C01B21/38; C01B21/46; B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/54; B01D53/56
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
72 words
A process for removing nitrogen oxides from exhaust gases which comprises: introducing an oxidizing gas into the exhaust gas to oxidize the nitrogen monoxide contained therein to nitrogen dioxide and thereby form a first oxidized exhaust gas; irradiating said first oxidized gas with actinic light to oxidize said nitrogen dioxide to nitric acid and thereby form a second oxidized exhaust gas; and removing said nitric acid from said second oxidized exhaust gas.
Claim 2
Dependent Claim
72 words
A process for removing nitrogen oxides from exhaust gases which comprises: introducing an oxidizing gas into the exhaust gas to oxidize the nitrogen monoxide contained therein to nitrogen dioxide and thereby form a first oxidized exhaust gas; irradiating said first oxidized gas with actinic light to oxidize said nitrogen dioxide to nitric acid and thereby form a second oxidized exhaust gas; and removing said nitric acid from said second oxidized exhaust gas.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein additional oxidizing gas is introduced into said first oxidized exhaust gas.
Claim 4
Dependent Claim
12 words
The process of claim 2 wherein said oxidizing gas is chlorine dioxide.
Claim 5
Dependent Claim
57 words
The process of claim 3 wherein at least 0.5 moles of said chlorine dioxide are introduced into the exhaust gas per mole of nitrogen monoxide to form said first oxidized exhaust gas and then at least 0.2 moles of said chlorine dioxide are added to said first oxidized exhaust gas per mole of nitrogen dioxide contained therein.
Claim 6
Dependent Claim
11 words
The process of claim 2 wherein said oxidizing gas is ozone.
Claim 7
Dependent Claim
53 words
The process of claim 5 wherein at least 1.0 moles of said ozone are introduced into the exhaust gas per mole of nitrogen monoxide to form said first oxidized exhaust gas and then at least 0.5 moles of said ozone are added to said first gas per mole of nitrogen dioxide contained therein.
Claim 8
Dependent Claim
34 words
The process of claim 1 wherein said oxidizing gas is chlorine dioxide and at least 0.7 moles of said chlorine dioxide are introduced into said exhaust gas per mole of nitrogen monoxide contained therein.
Claim 9
Dependent Claim
32 words
The process of claim 1 wherein said oxidizing gas is ozone and at least 1.5 moles of said ozone are introduced into said exhaust gas per mole of nitrogen monoxide contained therein.
Claim 10
Dependent Claim
19 words
The process of claim 1, wherein said actinic light has a wave length of between 2000 and 4000 A.
References Cited (Backward Citations)
CA679939A
Cited
JPS4851190A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-08-28 | 1982-02-27 | 1982-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-28 | 1986-02-27 | 1986-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-28 | 1990-02-27 | 1990-08-29 | $7700.00 | Window Closed / Lapsed |