US4132005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluidization of permanently magnetic particle beds
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1977-08-02
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Granted: 1979-01-02
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Expires: 1997-08-02
Abstract
Abstract A process for the stabilization of a fluidized bed against bubble formation which process comprises a vessel, a plurality of permanently magnetized particles dispersed throughout the bed, and means for fluidizing said particles. The particles are designated as permanently magnetized by virtue of their possessing a coercivity of at least 50 oersteds. The permanently magnetized particles exert magnetic attractive forces upon one another, thereby imparting stability to the fluidized bed. In these beds, fluid throughput rates which are up to 10 or more times the flow rate of said fluid at incipient fluidization of the unmagnetized particles can be achieved with little or no bubbling and at bed pressure drops equal to bed weight.
Inventors
- 👤 Costas A. Coulaloglou
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:19
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; B01J8/42; Y; Y10; Y10S; Y10S423/00; Y10S423/09; Y10S423/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
60 words
A fluidized bed process operated in the absence of an externally applied magnetic field which comprises passing a fluidizing gas upwardly through a substantially non-bubbling bed of fluidizable permanently magnetized particles at a velocity of at least twice the minimum fluidizing gas velocity required to fluidize the bed, said permanently magnetized particles having a coercivity of at least 50 oersteds.
Claim 2
Dependent Claim
60 words
A fluidized bed process operated in the absence of an externally applied magnetic field which comprises passing a fluidizing gas upwardly through a substantially non-bubbling bed of fluidizable permanently magnetized particles at a velocity of at least twice the minimum fluidizing gas velocity required to fluidize the bed, said permanently magnetized particles having a coercivity of at least 50 oersteds.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein said fluidizable permanently magnetized particles have a coercivity of at least 150 oersteds.
Claim 4
Dependent Claim
19 words
The process of claim 1 wherein said fluidizable permanently magnetized particles have a coercivity of at least 250 oersteds.
Claim 5
Dependent Claim
39 words
The process of claim 1 wherein said fluidizable permanently magnetized particles are selected from the group comprising ferrites, reduced iron ore, Carnuba wax/ ferrite composites, Alnico magnets, Al-Si ferrite composites, rare earth/Co alloys, single domain Fe and Fe-Co particles.
Claim 6
Dependent Claim
20 words
The process of claim 1 wherein said fluidizable permanently magnetized particles have a particle diameter of .05 to 1.0 mm.
Claim 7
Dependent Claim
20 words
The process of claim 1 wherein said fluidizable permanently magnetized particles have a Curie temperature of at least 300° C.
Claim 8
Dependent Claim
40 words
The process of claim 1 wherein said fluidizing gas is passed upwardly through a substantially non-bubbling bed of fluidizable permanently magnetized particles at a velocity of at least 5 times the minimum fluidizing gas velocity required to fluidize said bed.
Claim 9
Dependent Claim
40 words
The process of claim 1 wherein said fluidizing gas is passed upwardly through a substantially non-bubbling bed of fluidizable permanently magnetized particles at a velocity of at least 10 times the minimum fluidizing gas velocity required to fluidize said bed.
References Cited (Backward Citations)
US3440731A
Cited
US3439899A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-01 | 1982-07-03 | 1983-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-01 | 1986-07-03 | 1987-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-01 | 1990-07-03 | 1991-01-02 | $7700.00 | Window Closed / Lapsed |