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Patent US4231866A successfully refreshed from Google Patents.
US4231866A
Expired / Lapsed
US
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Recovery of organic and aqueous phases from solvent extraction emulsions
Assignee: United States Department of the Interior
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Filing: 1978-08-24
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Granted: 1980-11-04
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Expires: 1998-08-24
Abstract
Abstract Organic and aqueous phases are separated from solvent extraction emulsions by treatment of the emulsions with diatomaceous earth at elevated temperature, whereby the emulsion-forming matter is sorbed by the diatomaceous earth.
Inventors
- 👤 Kenneth W. Moser
- 👤 Richard E. Siemens
- 👤 Stanley C. Rhoads
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:06
CPC Classifications
B; B01; B01D; B01D17/00; B01D17/02; B01D17/0202; B01D17/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
81 words
A process for recovery of organic solvent and aqueous phases from solvent extraction emulsions consisting essentially of the steps of (1) admixing the emulsion with diatomaceous earth and heating the mixture to a temperature of about 45° to 60° C. for a time sufficient for the diatomaceous earth to sorb foreign matter from the emulsion, (2) separating the diatomaceous earth, with sorbed foreign matter, from the organic solvent and aqueous phases and (3) separately recovering the organic solvent and aqueous phases.
Claim 2
Dependent Claim
81 words
A process for recovery of organic solvent and aqueous phases from solvent extraction emulsions consisting essentially of the steps of (1) admixing the emulsion with diatomaceous earth and heating the mixture to a temperature of about 45° to 60° C. for a time sufficient for the diatomaceous earth to sorb foreign matter from the emulsion, (2) separating the diatomaceous earth, with sorbed foreign matter, from the organic solvent and aqueous phases and (3) separately recovering the organic solvent and aqueous phases.
Claim 3
Dependent Claim
28 words
The process of claim 1 in which the diatomaceous earth is employed in an amount of about 1 to 6 percent, based on the weight of the emulsion.
Claim 4
Dependent Claim
20 words
The process of claim 1 in which the temperature employed in treatment with the diatomaceous earth is about 55° C.
Claim 5
Dependent Claim
21 words
The process of claim 1 in which the time of treatment with the diatomaceous earth is about 5 to 20 minutes.
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) | 1983-11-04 | 1984-05-05 | 1984-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-04 | 1988-05-05 | 1988-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-04 | 1992-05-05 | 1992-11-04 | $7700.00 | Window Closed / Lapsed |