US4331645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alumina from alkali metal-aluminum chloride complexes
Assignee: Reynolds Metals Co
•
Filing: 1981-04-20
•
Granted: 1982-05-25
•
Expires: 2001-04-20
Abstract
Abstract A method for the production of reduction cell grade alumina from alkali metal/aluminum chloride complexes comprising the steps of: A. reacting the alkali metal/aluminum chloride complexes with oxygen in a three phase fluidized bed comprising: (I) as a solid phase, particles or pebbles of alumina of at least about 1/16'' in average diameter; (II) as a gaseous phase oxygen fed at a rate to provide a fluidizing gas velocity above about 8'/sec.; and (III) as a liquid phase coating the particles of alumina an alkali metal/aluminum chloride complexes; and B. separating the product solids from the gases exiting the fluidized bed.
Inventors
- 👤 Wendell E. Dunn, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:06
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; Y; Y10; Y10S; Y10S423/00; Y10S423/09; Y10S423/16
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
101 words
A method for the production of reduction cell grade alumina from alkali metal/aluminum chloride complexes comprising the steps of: A. reacting the alkali metal/aluminum chloride complexes with oxygen in a three phase fluidized bed comprising: (I) as a solid phase, particles or pebbles of alumina of at least about 1/16" in average diameter; (II) as a gaseous phase oxygen fed at a rate to provide a fluidizing gas velocity above about 8'/sec.; and (III) as a liquid phase coating the particles of alumina an alkali metal/aluminum chloride complex; and B. separating the product solids from the gases exiting the fluidized bed.
Claim 2
Independent Claim
101 words
A method for the production of reduction cell grade alumina from alkali metal/aluminum chloride complexes comprising the steps of: A. reacting the alkali metal/aluminum chloride complexes with oxygen in a three phase fluidized bed comprising: (I) as a solid phase, particles or pebbles of alumina of at least about 1/16" in average diameter; (II) as a gaseous phase oxygen fed at a rate to provide a fluidizing gas velocity above about 8'/sec.; and (III) as a liquid phase coating the particles of alumina an alkali metal/aluminum chloride complex; and B. separating the product solids from the gases exiting the fluidized bed.
Claim 3
Dependent Claim
18 words
The method of claim 1 wherein the reaction is carried out at a temperature above about 500° C.
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) | 1985-05-24 | 1985-11-23 | 1986-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-24 | 1989-11-23 | 1990-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-24 | 1993-11-23 | 1994-05-25 | $7700.00 | Window Closed / Lapsed |