Patent US2808431A successfully refreshed from Google Patents.
US2808431A
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Purification of crude naphthenic acid mixtures
Assignee: Pure Oil Co
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Filing: 1955-10-26
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Granted: 1957-10-01
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Expires: 1975-10-26
Abstract
No abstract record available.
Inventors
- 👤 William L Fierce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:25
CPC Classifications
C; C10; C10G; C10G19/00; C07; C07C; C07C51/00; C07C51/42; C07C51/48; C10G17/00; C10G17/02; C10G17/04; C10G19/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
THE PROCESS FOR THE PURIFICATION OF CRUDE NAPHTHENIC ACIDS WHICH COMPRISES TREATING SAID CRUDE NAPHTHENIC ACIDS WITH A SOLVENT CONSISTING OF 10% TO 74% BY VOLUME OF A HYDROCARBON SELECTED FROM THE GROUP OF N-HEXANE, N-HEPTANE, N-OCTANE, PETROLEUM NAPHTHA AND THEIR MIXTURES, 89.5% TO 10% BY VOLUME OF AN ALCOHOL SELECTED FROM THE GROUP OF METHANOL, ETHANOL, 2-PROPANOL AND THEIR MIXTURES, 0.5% TO 5.0% BY VOLUME OF AMMONIACAL BASE AND 0.0% TO 11.0% BNY VOLUME OF WATER, ALLOWING THE RESULTANT MIXTURE OF SOLVENT AND NAPHTHENIC ACIDS TO SEPARATE INTO AN UPPER HYDROCARBON SOLVENT PHASE AND A LOWER ALCOHOL PHASE AND SEPARATING THE ACLOHOL AND AMMONIA FROM SAID ALCOHOL PHASE TO RECOVER THE PURIFIED ACIDS HAVING AN ACID NUMBER OF AT LEAST ABOUT 148.
Claim 2
Dependent Claim
123 words
THE PROCESS FOR THE PURIFICATION OF CRUDE NAPHTHENIC ACIDS WHICH COMPRISES TREATING SAID CRUDE NAPHTHENIC ACIDS WITH A SOLVENT CONSISTING OF 10% TO 74% BY VOLUME OF A HYDROCARBON SELECTED FROM THE GROUP OF N-HEXANE, N-HEPTANE, N-OCTANE, PETROLEUM NAPHTHA AND THEIR MIXTURES, 89.5% TO 10% BY VOLUME OF AN ALCOHOL SELECTED FROM THE GROUP OF METHANOL, ETHANOL, 2-PROPANOL AND THEIR MIXTURES, 0.5% TO 5.0% BY VOLUME OF AMMONIACAL BASE AND 0.0% TO 11.0% BNY VOLUME OF WATER, ALLOWING THE RESULTANT MIXTURE OF SOLVENT AND NAPHTHENIC ACIDS TO SEPARATE INTO AN UPPER HYDROCARBON SOLVENT PHASE AND A LOWER ALCOHOL PHASE AND SEPARATING THE ACLOHOL AND AMMONIA FROM SAID ALCOHOL PHASE TO RECOVER THE PURIFIED ACIDS HAVING AN ACID NUMBER OF AT LEAST ABOUT 148.
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) | 1960-09-30 | 1961-04-01 | 1961-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-30 | 1965-04-01 | 1965-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-30 | 1969-04-01 | 1969-10-01 | $7700.00 | Window Closed / Lapsed |