US3783528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reactor staging
Assignee: Badger Co Inc
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Filing: 1971-01-05
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Granted: 1974-01-08
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Expires: 1991-01-05
Abstract
Abstract Catalyst staging of a fluidized catalyst bed in a reactor is achieved by providing horizontal ridges or flanges which interrupt downward flow of catalyst as a dense layer along vertical interior surfaces of the reactor.
Inventors
- 👤 H Sheely
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:07
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; B01J8/26; B01J8/28; B01J8/005; B01J8/0055; B01J8/006; B01J8/1836; C; C07; C07C; C07C17/00; C07C17/093; C07C17/15; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00106; B01J2208/00115; B01J2208/00132; B01J2208/00141; B01J2208/00327; B01J2208/00336; B01J2208/00353; B01J2208/00796; B01J2208/00823; B01J2208/00831; B01J2208/0084
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
216 words
Apparatus comprising in combination a vertical elongate vessel adapted to contain a body of subdivided solids, means for introducing a stream of gas into the bottom of said vessel at a velocity sufficient to maintain said body of solids in a dense turbulent fluidized state, means for withdrawing a stream of gas from the upper portion of said vessel, and means for dividing said fluidized body into at least two stages with limited downflow of solids from a higher stage to a lower stage, said means comprising a plurality of substantially continuous ridges on an inner vertical surface of said vessel surrounding said body, said ridges being spaced along said vertical surface with the spacing of said ridges being in the range of 6 to 12 inches for a vessel internal diameter of up to 3 feet and in the range of 1 to 3 feet for a vessel internal diameter in excess of 3 feet, each of said ridges comprising a single substantially horizontally extending ring having one edge flush with said surface and another edge that projects from said surface a distance in the range of one-half to 2 inches sufficient for said ring to interrupt downflow of subdivided solids along said surface without materially increasing the resistance to gas flow through said vessel.
Claim 2
Dependent Claim
216 words
Apparatus comprising in combination a vertical elongate vessel adapted to contain a body of subdivided solids, means for introducing a stream of gas into the bottom of said vessel at a velocity sufficient to maintain said body of solids in a dense turbulent fluidized state, means for withdrawing a stream of gas from the upper portion of said vessel, and means for dividing said fluidized body into at least two stages with limited downflow of solids from a higher stage to a lower stage, said means comprising a plurality of substantially continuous ridges on an inner vertical surface of said vessel surrounding said body, said ridges being spaced along said vertical surface with the spacing of said ridges being in the range of 6 to 12 inches for a vessel internal diameter of up to 3 feet and in the range of 1 to 3 feet for a vessel internal diameter in excess of 3 feet, each of said ridges comprising a single substantially horizontally extending ring having one edge flush with said surface and another edge that projects from said surface a distance in the range of one-half to 2 inches sufficient for said ring to interrupt downflow of subdivided solids along said surface without materially increasing the resistance to gas flow through said vessel.
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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |