US4258017A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vanadium removal from furnace gases
Assignee: Honeywell UOP LLC
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Filing: 1979-07-26
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Granted: 1981-03-24
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Expires: 1999-07-26
Abstract
Abstract A method of reducing the corrosiveness of furnace gases by removing vanadium compounds from the furnace gases is disclosed. The gases are contacted with high surface area silica-alumina composites before the gases are passed into the convection heating zone of the furnace. The vanadium compounds are collected on the silica-alumina composites.
Inventors
- 👤 Dennis B. Gelfand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:56
CPC Classifications
F; F23; F23J; F23J15/00; F23J15/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
191 words
A method of reducing the vanadium concentration of flue gas derived from the combustion of a liquid residual oil containing vanadium compounds wherein said flue gas is passed through a radiant heating zone and convection heating zone of a furnace, which method comprises the steps of: (a) removing said flue gas stream derived from said combustion of said liquid residual oil containing vanadium compounds from said radiant heating zone of said furnace; (b) passing said flue gas stream removed from said radiant heating zone of said furnace through a passage duct wherein said flue gas stream is passed through a contacting zone comprising a multiplicity of high surface area contacting bodies extending across the cross-sectional area of said passage duct, wherein said contacting bodies comprise a refractory alumina-silica composite maintained at conditions effective to promote the transfer of said vanadium compounds in said flue gas stream to said contacting bodies; (c) removing said flue gas stream from said passage duct possessing a diminished quantity of said vanadium compounds; and (d) passing said flue gas stream containing a diminished quantity of said vanadium compounds into said convection heating zone of said furnace.
Claim 2
Independent Claim
191 words
A method of reducing the vanadium concentration of flue gas derived from the combustion of a liquid residual oil containing vanadium compounds wherein said flue gas is passed through a radiant heating zone and convection heating zone of a furnace, which method comprises the steps of: (a) removing said flue gas stream derived from said combustion of said liquid residual oil containing vanadium compounds from said radiant heating zone of said furnace; (b) passing said flue gas stream removed from said radiant heating zone of said furnace through a passage duct wherein said flue gas stream is passed through a contacting zone comprising a multiplicity of high surface area contacting bodies extending across the cross-sectional area of said passage duct, wherein said contacting bodies comprise a refractory alumina-silica composite maintained at conditions effective to promote the transfer of said vanadium compounds in said flue gas stream to said contacting bodies; (c) removing said flue gas stream from said passage duct possessing a diminished quantity of said vanadium compounds; and (d) passing said flue gas stream containing a diminished quantity of said vanadium compounds into said convection heating zone of said furnace.
Claim 3
Dependent Claim
21 words
The method of claim 1 further characterized in that the high surface area contacting bodies comprise a bed of alumina-silica spheres.
Claim 4
Dependent Claim
29 words
The method of claim 2 further characterized in that fresh alumina-silica spheres are periodically added to the bed and in that used spheres are periodically removed from the bed.
Claim 5
Dependent Claim
49 words
The method of claim 1 further characterized in that the high surface area contacting bodies comprise a plurality of aluminasilica planar panels located at different elevations and arranged in a manner which requires the combustion gas stream to travel vertically in a sigmoid flow path through the contacting zone.
Claim 6
Dependent Claim
17 words
The method of claim 4 further characterized in that the panels are horizontal along their major axis.
Claim 7
Dependent Claim
24 words
The method of claim 1 further characterized in that the high surface area contacting bodies comprise from about 35 to about 50 wt.% alumina.
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) | 1984-03-23 | 1984-09-22 | 1985-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-23 | 1988-09-22 | 1989-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-23 | 1992-09-22 | 1993-03-24 | $7700.00 | Window Closed / Lapsed |