US4244935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming metal chlorides
Assignee: Alcoa Corp
•
Filing: 1978-04-20
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Granted: 1981-01-13
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Expires: 1998-04-20
Abstract
Abstract A method of forming the chloride of a metal-oxygen-containing substance, including the steps of coating particles of such substance with green carbon, i.e. carbon which contains substances more volatile than carbon, heating the coated particles to drive off the volatile matter and produce openings such as pores and fissures, and then reacting the particles from the step of heating with a source of chlorine.
Inventors
- 👤 M. Benjamin Dell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:45
CPC Classifications
C; C01; C01B; C01B9/00; C01B9/02; C01B33/00; C01B33/08; C01B33/107; C01B33/1071; C01B33/10715; C01F; C01F7/00; C01F7/48; C01F7/56; C01F7/58; C01F7/60
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
77 words
A method of chlorinating particles of a substance containing metal and oxygen, comprising: coking a liquid or gaseous coking charge stock on such particles for coating them with carbon which contains volatile matter under conditions permitting retention of volatile matter, heating the coated particles for driving off the volatile matter and for creating openings in the coating, and exposing the particles with the thus-opened coating to a source of chlorine for producing the chloride of said metal.
Claim 2
Independent Claim
77 words
A method of chlorinating particles of a substance containing metal and oxygen, comprising: coking a liquid or gaseous coking charge stock on such particles for coating them with carbon which contains volatile matter under conditions permitting retention of volatile matter, heating the coated particles for driving off the volatile matter and for creating openings in the coating, and exposing the particles with the thus-opened coating to a source of chlorine for producing the chloride of said metal.
Claim 3
Dependent Claim
12 words
A method as claimed in claim 1 wherein said metal is aluminum.
Claim 4
Dependent Claim
13 words
A method as claimed in claim 2 wherein the aluminum-oxygen substance is alumina.
Claim 5
Dependent Claim
18 words
A method as claimed in claim 3 wherein the alpha-alumina content in the substance is greater than 5%.
Claim 6
Dependent Claim
21 words
A method as claimed in claim 1 wherein the coking step is carried out in the temperature range of 450°-725° C.
Claim 7
Dependent Claim
21 words
A method as claimed in claim 1 wherein the coking step is carried out in the temperature range of 450°-650° C.
Claim 8
Dependent Claim
27 words
A method as claimed in claim 1 wherein the coking step is carried out in a fluidized bed by the spraying of said stock onto the particles.
Claim 9
Dependent Claim
17 words
A method as claimed in claim 1 wherein the heating step is carried out between 700°-1100° C.
Claim 10
Dependent Claim
17 words
A method as claimed in claim 1 wherein the heating step is carried out between 700°-850° C.
Claim 11
Dependent Claim
20 words
A method as claimed in claim 1 wherein the exposing step is carried out at temperatures greater than 400° C.
Claim 12
Dependent Claim
15 words
The method of claim 1 wherein the openings in the coating comprise cracks or fissures.
References Cited (Backward Citations)
US1749854A
Cited
US1878013A
Cited
US1865008A
Cited
US3102047A
Cited
GB1204353A
Cited
US3811916A
Cited
US3842163A
Cited
US4139416A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-13 | 1984-07-14 | 1985-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-13 | 1988-07-14 | 1989-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-13 | 1992-07-14 | 1993-01-13 | $7700.00 | Window Closed / Lapsed |