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US4853205A
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Supercritical fluid metal halide separation process
Assignee: United States Department of the Interior
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Filing: 1987-03-12
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Granted: 1989-08-01
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Expires: 2007-03-12
Abstract
Abstract Process of using supercritical fluid to selectively separate, purify and recover metal halides.
Inventors
- 👤 William K. Tolley
- 👤 Alton B. Whitehead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:59
CPC Classifications
C; C01; C01B; C01B9/00; C01F; C01F7/00; C01F7/48; C01F7/56; C01G; C01G23/00; C01G23/02; C01G23/022; C01G31/00; C01G31/04; C01G49/00; C01G49/10; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/54; Y10; Y10S; Y10S423/00; Y10S423/09; Y10S423/11
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
119 words
A process for separating, purifying and recovering metal halide from a mixture, using supercritical fluids comprising: placing a mixture containing metal halides in an autoclave; passing a supercritical fluid selected from the group consisting of carbon dioxide, ethane, propane, fluorocarbons, pentane, chlorofluorocarbons, and mixtures thereof at temperatures from about 15° to about 400° C. and at pressures from about 700 to about 25,000 psig through the mixture; removing said supercritical fluid and a more soluble metal halide dissolved in said supercritical fluid; altering process variables selected from the class of temperature and pressure to effect precipitation of the more soluble metal halide dissolved in said supercritical fluid; and recovering the less soluble metal halide residue remaining in the autoclave.
Claim 2
Dependent Claim
119 words
A process for separating, purifying and recovering metal halide from a mixture, using supercritical fluids comprising: placing a mixture containing metal halides in an autoclave; passing a supercritical fluid selected from the group consisting of carbon dioxide, ethane, propane, fluorocarbons, pentane, chlorofluorocarbons, and mixtures thereof at temperatures from about 15° to about 400° C. and at pressures from about 700 to about 25,000 psig through the mixture; removing said supercritical fluid and a more soluble metal halide dissolved in said supercritical fluid; altering process variables selected from the class of temperature and pressure to effect precipitation of the more soluble metal halide dissolved in said supercritical fluid; and recovering the less soluble metal halide residue remaining in the autoclave.
Claim 3
Dependent Claim
33 words
The process of claim 1, wherein the mixture contains TiCl 4 and AlCl 3 , the supercritical fluid is CO 2 , the temperature is 53° C., and the pressure is 1,550 psig.
Claim 4
Dependent Claim
36 words
The process of claim 1, wherein the mixture contains TiCl 4 , AlCl 3 and FeCl 3 , the supercritical fluid is CO 2 , the temperature is 55° C., and the pressure is 1,600 psig.
Claim 5
Dependent Claim
33 words
The process of claim 1, wherein the mixture contains AlCl 3 and FeCl 3 , the supercritical fluid is CO 2 , the temperature is 55° C. and the pressure is 2,300 psig.
Claim 6
Dependent Claim
32 words
The process of claim 1, wherein the mixture contains aluminum chloride and gallium chloride, the supercritical fluid is CO 2 , the temperature is 53° C., and the pressure is 1,550 psig.
Claim 7
Dependent Claim
33 words
The process of claim 1, wherein the mixture contains VOCl 3 and TiCl 4 , the supercritical fluid is CO 2 , the temperature is 53° C., and the pressure is 1,550 psig.
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) | 1992-07-31 | 1993-01-30 | 1993-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-31 | 1997-01-30 | 1997-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-31 | 2001-01-30 | 2001-08-01 | $7700.00 | Window Closed / Lapsed |