US4039647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of aluminum chloride
Assignee: Alcoa Corp
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Filing: 1975-12-24
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Granted: 1977-08-02
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Expires: 1995-12-24
Abstract
Abstract An improved method is disclosed for producing aluminum chloride by contacting aluminum oxide, a reducing agent, and chlorine in a molten bath of aluminum chloride and metal halide to form aluminum chloride which is recovered from the bath by sublimation. The improvement comprises increasing the rate of formation of aluminum chloride by adding a source of metal selected from the group consisting of iron, chromium, copper, europium and cerium to the molten bath.
Inventors
- 👤 David A. Wohleber
- 👤 C. Norman Cochran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:50
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/48; C01F7/56; C01F7/58; C01F7/60; C22; C22B; C22B21/00; C22B21/0038; C22B21/0046; Y; Y10; Y10S; Y10S423/00; Y10S423/09; Y10S423/12
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
86 words
In an improved method of producing AlCl 3 by contacting alumina and a reducing agent with a source of chlorine in a molten bath comprisng AlCl 3 and metal halide to form AlCl 3 and by recovering the AlCl 3 by vaporization from the bath, the improvement which comprises, adding a source of metal selected from the group consisting of iron, chromium, copper, europium and cerium to the molten bath to increase the rate of formation of said aluminum chloride by catalytic action of said metal.
Claim 2
Dependent Claim
86 words
In an improved method of producing AlCl 3 by contacting alumina and a reducing agent with a source of chlorine in a molten bath comprisng AlCl 3 and metal halide to form AlCl 3 and by recovering the AlCl 3 by vaporization from the bath, the improvement which comprises, adding a source of metal selected from the group consisting of iron, chromium, copper, europium and cerium to the molten bath to increase the rate of formation of said aluminum chloride by catalytic action of said metal.
Claim 3
Dependent Claim
12 words
The method according to claim 1 wherein the reducing agent is carbon.
Claim 4
Dependent Claim
13 words
The method according to claim 1 wherein the reducing agent is carbon monoxide.
Claim 5
Dependent Claim
26 words
The method according to claim 1 wherein the metal halide of the bath is selected from the group consisting of alkali and alkaline earth metal halide.
Claim 6
Dependent Claim
15 words
The method according to claim 1 wherein the source of metal is a metal halide.
Claim 7
Dependent Claim
14 words
The method according to claim 5 wherein the metal halide is a metal chloride.
Claim 8
Dependent Claim
27 words
The method according to claim 6 wherein the metal chloride is selected from the group consisting of FeCl 3 , CrCl.sub. 3, CuCl and CuCl 2 .
Claim 9
Dependent Claim
22 words
The metal according to claim 6 wherein the metal chloride is selected from the group consisting of CuCl and CuCl 2 .
Claim 10
Dependent Claim
22 words
The method according to claim 6 wherein the bath is operated at a temperature in the range of 780° to 815° C.
Claim 11
Dependent Claim
103 words
In an improved method of producing AlCl 3 by contacting alumina and a carbonaceous reducing agent with chlorine in a molten bath comprising AlCl 3 and NaCl to form AlCl 3 and by recovering the AlCl 3 by vaporization from the bath, the improvement which comprises, adding to the bath a metal chloride selected from the group consisting of FeCl 3 , CrCl 3 , CuCl and CuCl 2 to increase the rate of formation of said aluminum chloride by catalytic action of the metal of said chloride, said bath being kept at a temperature in the range of 780° to 815° C.
Claim 12
Dependent Claim
103 words
In an improved method of producing AlCl 3 by contacting alumina and a carbonaceous reducing agent with chlorine in a molten bath comprising AlCl 3 and NaCl to form AlCl 3 and by recovering the AlCl 3 by vaporization from the bath, the improvement which comprises, adding to the bath a metal chloride selected from the group consisting of FeCl 3 , CrCl 3 , CuCl and CuCl 2 to increase the rate of formation of said aluminum chloride by catalytic action of the metal of said chloride, said bath being kept at a temperature in the range of 780° to 815° C.
Claim 13
Dependent Claim
15 words
The method according to claim 1 wherein the source of metal is a metal oxide.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |