Patent US2717879A successfully refreshed from Google Patents.
US2717879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of treating solution
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1952-12-17
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Granted: 1955-09-13
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Expires: 1972-12-17
Abstract
No abstract record available.
Inventors
- 👤 Linnie P Hodges
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:11
CPC Classifications
C; C10; C10G; C10G19/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
A METHOD FOR TREATING AN AQUEOUS SOLUTION CONTAINING ALKALI METAL NAPHTHENATES, ALKALI METAL SULFONATES, ALKALI METAL SULFATES, ALKALI METAL HYDROXIDE AND OIL TO RECOVER SAID SOLUTION AND SEPARATE NAPHTHENIC ACIDS WHICH COMPRISES DILUTING SAID SOLUTION WITH NO LESS THAN 2 VOLUMES OF WATER PER VOLUME OF SOLUTION AND THEN ACIDIFYING SAID DILUTE SOLUTION WITH A MINERAL ACID IN AN AMOUNT SUFFICIENT TO PROVIDE AN ACIDIFIED SOLUTION HAVING A PH NO GREATER THAN 3, SETTLING THE ACIDIFIED SOLUTION TO FORM AN AQUEOUS LAYER AND AN OILY LAYER, RECOVERING SAID OILY LAYER CONTAINING NAPHTHENIC ACIDS, AND CONCENTRATING AND NEUTRALIZING SAID AQUEOUS LAYER TO PROVIDE A TREATING REAGENT COMPRISING ALKALI METAL HYDROXIDE, ALKALI METAL SALT OF SULFONIC ACID, ALKALI METAL SALT OF INORGANIC ACID, AND WATER IN AMOUNTS, RESPECTIVELY, IN THE RANGE BETWEEN 0.5% AND 5% BY WEIGHT, 10% AND 30% BY WEIGHT, 5% AND 10% BY WEIGHT, AND 55% AND 84.5% BY WEIGHT.
Claim 2
Independent Claim
151 words
A METHOD FOR TREATING AN AQUEOUS SOLUTION CONTAINING ALKALI METAL NAPHTHENATES, ALKALI METAL SULFONATES, ALKALI METAL SULFATES, ALKALI METAL HYDROXIDE AND OIL TO RECOVER SAID SOLUTION AND SEPARATE NAPHTHENIC ACIDS WHICH COMPRISES DILUTING SAID SOLUTION WITH NO LESS THAN 2 VOLUMES OF WATER PER VOLUME OF SOLUTION AND THEN ACIDIFYING SAID DILUTE SOLUTION WITH A MINERAL ACID IN AN AMOUNT SUFFICIENT TO PROVIDE AN ACIDIFIED SOLUTION HAVING A PH NO GREATER THAN 3, SETTLING THE ACIDIFIED SOLUTION TO FORM AN AQUEOUS LAYER AND AN OILY LAYER, RECOVERING SAID OILY LAYER CONTAINING NAPHTHENIC ACIDS, AND CONCENTRATING AND NEUTRALIZING SAID AQUEOUS LAYER TO PROVIDE A TREATING REAGENT COMPRISING ALKALI METAL HYDROXIDE, ALKALI METAL SALT OF SULFONIC ACID, ALKALI METAL SALT OF INORGANIC ACID, AND WATER IN AMOUNTS, RESPECTIVELY, IN THE RANGE BETWEEN 0.5% AND 5% BY WEIGHT, 10% AND 30% BY WEIGHT, 5% AND 10% BY WEIGHT, AND 55% AND 84.5% BY WEIGHT.
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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) | 1958-09-12 | 1959-03-14 | 1959-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-09-12 | 1963-03-14 | 1963-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-09-12 | 1967-03-14 | 1967-09-13 | $7700.00 | Window Closed / Lapsed |