US2730190A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of oil-containing water
Assignee: Union Oil Company of California
•
Filing: 1952-02-08
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Granted: 1956-01-10
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Expires: 1972-02-08
Abstract
No abstract record available.
Inventors
- 👤 James S Brown
- 👤 Paul W Fischer
- 👤 Leslie C Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:48
CPC Classifications
B; B01; B01D; B01D17/00; B01D17/02; B01D17/0205; C; C10; C10G; C10G33/00; C10G33/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
230 words
A METHOD FOR THE PURIFICATION OF OIL-CONTAMINATED WATER WHICH COMPRISES PASSING AN OIL-CONTAMINATED RAW WATER FEED STREAM SUCCESSIVELY THROUGH A PLURALITY OF INDIVIDUAL FLOTATION ZONES IN A MULTICELL FLOTATION ZONE SO AS TO PROVIDE THEREIN A WATER RESIDENCE TIME OF BETWEEN ABOUT ONE AND ABOUT 60 MINUTES, REMOVING AS A CLEAN WATER RECYCLE A PORTION OF THE CLEAN WATER FLOWING FROM THE LAST OF SAID INDIVIDUAL FLOTATION ZONES, CONTROLLING SAID CLEAN WATER RECYCLE AT A RATE OF BETWEEN ABOUT 5% AND ABOUT 35% OF THE FLOW RATE OF SAID RAW WATER FEED, COMBINING SAID CLEAN WATER RECYCLE WITH A FLOTATION GAS UNDER PRESSURE AT A RATE OF BETWEEN ABOUT 0.05 AND ABOUT 5.0 S.C.F. PER BARREL OF SAID RAW WATER FEED STREAM WHEREBY AT LEAST A PORTION OF SAID GAS IS DISSOLVED THEREIN, INJECTING AND DEPRESSURING A PORTION OF THE GAS-LADENED WATER INTO EACH OF SAID INDIVIDUAL FLOTATION ZONES WHEREBY FLOTATION GAS BUBBLES ARE FORMED BY DISSOLUTION OF THE DISSOLVED PORTION OF GAS IN THE DEPRESSURING STEP AND PASS WITH THE UNDISSOLVED PORTION OF GAS COUNTERCURRENT TO THE FLOW OF WATER THROUGH EACH INDIVIDUAL FLOTATION ZONE REDUCING THE OIL CONTAMINATION THEREOF, REMOVING A STREAM OF OIL ACCUMULATING IN SAID MULTICELL FLOTATION ZONE AS A PRODUCT OF THE PROCESS, AND REMOVING THE REMAINING PORTION OF SAID CLEAN WATER FROM THE LAST OF SAID IDIVIDUAL FLOTATION ZONES AS A CLEAN WATER PRODUCT.
Claim 2
Independent Claim
230 words
A METHOD FOR THE PURIFICATION OF OIL-CONTAMINATED WATER WHICH COMPRISES PASSING AN OIL-CONTAMINATED RAW WATER FEED STREAM SUCCESSIVELY THROUGH A PLURALITY OF INDIVIDUAL FLOTATION ZONES IN A MULTICELL FLOTATION ZONE SO AS TO PROVIDE THEREIN A WATER RESIDENCE TIME OF BETWEEN ABOUT ONE AND ABOUT 60 MINUTES, REMOVING AS A CLEAN WATER RECYCLE A PORTION OF THE CLEAN WATER FLOWING FROM THE LAST OF SAID INDIVIDUAL FLOTATION ZONES, CONTROLLING SAID CLEAN WATER RECYCLE AT A RATE OF BETWEEN ABOUT 5% AND ABOUT 35% OF THE FLOW RATE OF SAID RAW WATER FEED, COMBINING SAID CLEAN WATER RECYCLE WITH A FLOTATION GAS UNDER PRESSURE AT A RATE OF BETWEEN ABOUT 0.05 AND ABOUT 5.0 S.C.F. PER BARREL OF SAID RAW WATER FEED STREAM WHEREBY AT LEAST A PORTION OF SAID GAS IS DISSOLVED THEREIN, INJECTING AND DEPRESSURING A PORTION OF THE GAS-LADENED WATER INTO EACH OF SAID INDIVIDUAL FLOTATION ZONES WHEREBY FLOTATION GAS BUBBLES ARE FORMED BY DISSOLUTION OF THE DISSOLVED PORTION OF GAS IN THE DEPRESSURING STEP AND PASS WITH THE UNDISSOLVED PORTION OF GAS COUNTERCURRENT TO THE FLOW OF WATER THROUGH EACH INDIVIDUAL FLOTATION ZONE REDUCING THE OIL CONTAMINATION THEREOF, REMOVING A STREAM OF OIL ACCUMULATING IN SAID MULTICELL FLOTATION ZONE AS A PRODUCT OF THE PROCESS, AND REMOVING THE REMAINING PORTION OF SAID CLEAN WATER FROM THE LAST OF SAID IDIVIDUAL FLOTATION ZONES AS A CLEAN WATER PRODUCT.
References Cited (Backward Citations)
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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) | 1959-01-09 | 1959-07-11 | 1960-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-09 | 1963-07-11 | 1964-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-09 | 1967-07-11 | 1968-01-10 | $7700.00 | Window Closed / Lapsed |