Patent US3886261A successfully refreshed from Google Patents.
US3886261A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alumina as a cold-end additive
Assignee: Veolia WTS USA Inc
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Filing: 1973-11-01
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Granted: 1975-05-27
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Expires: 1993-11-01
Abstract
Abstract The present invention is directed to a method of controlling the condensation of sulfur trioxide in flue gases to thereby inhibit the corrosion of metallic parts because of the sulfuric acid inherently formed. Basically, the requirements on the addition of particulate alumina (Al2O3) to the flue gas at a place where it is experiencing turbulence, and where its temperature is below 1000* F, and preferably within the range of 450* F. to 650* F.
Inventors
- 👤 Bruce L Libutti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:42
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/508; C; C23; C23F; C23F15/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
91 words
A METHOD OF REDUCING THE AMOUNT OF SULFUR TRIOXIDE CONDENSATION ON, AND THEREFORE THE AMOUNT OF SULFURIC ACID CORROSON OF, METAL PARTS IN CONTACT WITH FLUE GASES DERIVED FROM THE COMBUSTION F SULFUR CONTAINING FUELS WHICH COMPRISES ADDING TO THE FLUE GASES AT THE COLD-END OF THE COMBUSTION SYSTEM WHERE THE GASES ARE BELOW 1000*F A PARTICULAR ALUMINA HAVING A PARTICLE SIZE OF 260 MICRONS OR LESS, SAID ALUMINA BEING ADDED TO THE GAS IN AN AMOUNT FROM ABOUT 0.01 TO 0.5 MOLES OF ALUMINA PER MOLE OF SULFUR TRIOXIDE GENERATED.
Claim 2
Independent Claim
91 words
A METHOD OF REDUCING THE AMOUNT OF SULFUR TRIOXIDE CONDENSATION ON, AND THEREFORE THE AMOUNT OF SULFURIC ACID CORROSON OF, METAL PARTS IN CONTACT WITH FLUE GASES DERIVED FROM THE COMBUSTION F SULFUR CONTAINING FUELS WHICH COMPRISES ADDING TO THE FLUE GASES AT THE COLD-END OF THE COMBUSTION SYSTEM WHERE THE GASES ARE BELOW 1000*F A PARTICULAR ALUMINA HAVING A PARTICLE SIZE OF 260 MICRONS OR LESS, SAID ALUMINA BEING ADDED TO THE GAS IN AN AMOUNT FROM ABOUT 0.01 TO 0.5 MOLES OF ALUMINA PER MOLE OF SULFUR TRIOXIDE GENERATED.
Claim 3
Dependent Claim
27 words
A method according to claim 1 wherein the alumina is added to the flue gas at a place where the flue gas is in a turbulent state.
Claim 4
Dependent Claim
28 words
A method according to claim 1 wherein the temperature of the flue gas at the time of addition of the alumina is from about 650* to 450* F.
Claim 5
Dependent Claim
23 words
A method according to claim 3 wherein the alumina is added to the flue gas while said gas is in a turbulent state.
References Cited (Backward Citations)
US2992884A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |