US4207185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for purifying liquids
Assignee: Chevron USA Inc
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Filing: 1978-10-25
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Granted: 1980-06-10
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Expires: 1998-10-25
Abstract
Abstract A method for separating a first liquid from a mixture with a second liquid or particulate solid by a series of froth flotation and froth separation stages is improved by recycling a portion of the mixture recovered upstream of the last flotation stage to an initial or an intermediate stage further upstream from the point where the recycled liquid is obtained.
Inventors
- 👤 Robert J. Hinds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:37
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/02; B01; B01D; B01D17/00; B01D17/02; B01D17/0205; B03D1/14; B03D1/1443; B03D1/1475
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
170 words
In a method for separating a first liquid from a mixture of said first liquid and a particulate solid or a second liquid insoluble in said first liquid, by treating said mixture in a series of flotation steps including at least a first step and a last step, each said step including (1) forming froth including said solid or said second liquid by mixing gas with said mixture and (2) separating froth from said mixture, and said last step further including contacting a first recycle portion of said mixture remaining after froth is separated therefrom in said last step with said mixture prior to separating froth therefrom in said last step, the improvement comprising: admixing said mixture, before separating froth from said mixture in said first step, with a second recycle portion of said mixture remaining after froth is separated from said mixture in said first step and before gas is mixed with said mixture in said last step, said second recycle portion being segregated from said first recycle portion.
Claim 2
Dependent Claim
170 words
In a method for separating a first liquid from a mixture of said first liquid and a particulate solid or a second liquid insoluble in said first liquid, by treating said mixture in a series of flotation steps including at least a first step and a last step, each said step including (1) forming froth including said solid or said second liquid by mixing gas with said mixture and (2) separating froth from said mixture, and said last step further including contacting a first recycle portion of said mixture remaining after froth is separated therefrom in said last step with said mixture prior to separating froth therefrom in said last step, the improvement comprising: admixing said mixture, before separating froth from said mixture in said first step, with a second recycle portion of said mixture remaining after froth is separated from said mixture in said first step and before gas is mixed with said mixture in said last step, said second recycle portion being segregated from said first recycle portion.
Claim 3
Dependent Claim
60 words
An improved method according to claim 1 wherein said series of flotation steps includes at least one intermediate step, said recycle second portion is separated from said mixture after froth is separated from said mixture in said intermediate step, and said recycle second portion is admixed with said mixture before froth is separated from said mixture in said intermediate step.
Claim 4
Dependent Claim
13 words
An improved method according to claim 1 wherein said first liquid comprises water.
Claim 5
Dependent Claim
21 words
An improved method according to claim 1 wherein froth is formed in said flotation steps by mixing air with said mixture.
Claim 6
Dependent Claim
14 words
An improved method according to claim 1 wherein said mixture includes a particulate solid.
Claim 7
Dependent Claim
28 words
An improved method according to claim 1 wherein said mixture includes a second liquid, and said second liquid is a hydrocarbonaceous liquid substantially insoluble in said first liquid.
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) | 1983-06-10 | 1983-12-10 | 1984-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-10 | 1987-12-10 | 1988-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-10 | 1991-12-10 | 1992-06-10 | $7700.00 | Window Closed / Lapsed |