US4035169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the purification of aluminum chloride
Assignee: Toth Aluminum Corp
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Filing: 1975-11-12
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Granted: 1977-07-12
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Expires: 1995-11-12
Abstract
Abstract A process is disclosed for collecting and purifying aluminum chloride from gases like those produced from the chlorination of bauxite, clay and other aluminous ores. The method comprises first dissolving the aluminum chloride at about atmospheric pressure in a molten salt solvent in which most of the other principal metal chloride vapors, like SiCl 4 and TiCl 4 , are substantially insoluble; then vaporizing and separating the AlCl 3 to produce a purified liquid product. This process eliminates the previous use of costly and/or hazardous compressors and scraped-wall condensers and provides for economical recovery of purified liquid aluminum chloride.
Inventors
- 👤 Roger Frank Sebenik
- 👤 Alfred Lippman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:56
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/48; C01F7/56; C01F7/62
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
140 words
In a method for recovering aluminum chloride from a mixed chloride gas containing aluminum chloride and at least one chloride selected from the group consisting essentially of FeCl 3 , TiCl 4 and SiCl 4 which comprises contacting said mixed chloride gas at atmosphereic pressure with a liquid solvent in which aluminum chloride is soluble to dissolve the aluminum chloride, and recovering the aluminum chloride from the solvent by distilling the aluminum chloride from the solvent at a pressure sufficient to condense the aluminum chloride as a liquid, the improvement comprising: employing as the solvent an inorganic salt mixture selected from the group consisting of NaCl--AlCl 3 --FeCl 3 , NaCl--AlCl 3 --FeCl 2 , NaCl--AlCl 3 --FeCl 3 --FeCl 2 , AlCl 3 --FeCl 3 , AlCl 3 --FeCl 2 , and AlCl 3 --FeCl 3 --FeCl 2 .
Claim 2
Dependent Claim
140 words
In a method for recovering aluminum chloride from a mixed chloride gas containing aluminum chloride and at least one chloride selected from the group consisting essentially of FeCl 3 , TiCl 4 and SiCl 4 which comprises contacting said mixed chloride gas at atmosphereic pressure with a liquid solvent in which aluminum chloride is soluble to dissolve the aluminum chloride, and recovering the aluminum chloride from the solvent by distilling the aluminum chloride from the solvent at a pressure sufficient to condense the aluminum chloride as a liquid, the improvement comprising: employing as the solvent an inorganic salt mixture selected from the group consisting of NaCl--AlCl 3 --FeCl 3 , NaCl--AlCl 3 --FeCl 2 , NaCl--AlCl 3 --FeCl 3 --FeCl 2 , AlCl 3 --FeCl 3 , AlCl 3 --FeCl 2 , and AlCl 3 --FeCl 3 --FeCl 2 .
Claim 3
Dependent Claim
32 words
The method of claim 1 wherein the solvent has a melting point not greater than about 200° C., a boiling point greater than 250° C. and is mutually soluble with aluminum chloride.
Claim 4
Dependent Claim
32 words
The method of claim 1 wherein the mixed chloride gas containing aluminum chloride orginates from the carbo-chlorination of a raw material selected from the group consisting of clay, bauxite, or ferrunginous bauxite.
Claim 5
Dependent Claim
35 words
The method of claim 1 wherein any aluminum chloride gas that is not initially separated from the mixed chloride gas by contacting with the liquid solvent is subsequently recovered in the manner of claim 1.
Claim 6
Dependent Claim
25 words
The method of claim 1 wherein FeCl 3 dissolved from the mixed chloride gas is essentially reduced to FeCl 2 for separation from the solvent.
Claim 7
Dependent Claim
17 words
The method of claim 5 wherein the FeCl 2 is essentially separated from the solvent by crystallization.
Claim 8
Dependent Claim
21 words
The method of claim 1 wherein the solvent comprises a ternary mixture of NaCl, AlCl 3 , and FeCl 3 .
Claim 9
Dependent Claim
21 words
The method of claim 1 wherein the solvent comprises a ternary mixture of NaCl, AlCl 3 , and FeCl 2 .
Claim 10
Dependent Claim
24 words
The method of claim 1 wherein the solvent comprises a quaternary mixture of NaCl, AlCl 3 , FeCl 3 , and FeCl 2 .
Claim 11
Dependent Claim
19 words
The method of claim 1 wherein the solvent comprises a binary mixture of AlCl 3 and FeCl 3 .
Claim 12
Dependent Claim
19 words
The method of claim 1 wherein the solvent comprises a binary mixture of AlCl 3 and FeCl 2 .
Claim 13
Dependent Claim
23 words
The method of claim 1 wherein the solvent comprises a ternary mixture of AlCl 3 , FeCl 3 , and FeCl 2 .
References Cited (Backward Citations)
US3938969A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-11 | 1981-01-10 | 1981-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-11 | 1985-01-10 | 1985-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-11 | 1989-01-10 | 1989-07-12 | $7700.00 | Window Closed / Lapsed |