US2679535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of phenol
Assignee: California Research LLC
•
Filing: 1952-08-19
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Granted: 1954-05-25
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Expires: 1972-08-19
Abstract
No abstract record available.
Inventors
- 👤 Jr Harrison M Lavender
- 👤 John R B Ellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:22
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/68; C07C37/70; C07C37/72
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
A PROCESS FOR RECOVERING PHENOL FROM CUMENE HYDROPEROXIDE DECOMPOSITION MIXTURES WHICH COMPRISES FRACTIONALLY DISTILLING THE DECOMPOSITION MIXTURE TO SEPARATE AN ACETONERICH OVERHEAD FRACTION AND A PHENOL-RICH BOTTOMS FRACTION, MIXING THE BOTTOMS FRACTION WITH 50% TO 500% BY WEIGHT OF WATER BASED ON THE PHENOL CONTENT OF THE FRACTION IN A MIXING ZONE, SETTLING THE RESULTANT AQUEOUS MIXTURE AT A TEMPERATURE ABOVE 65* C. TO SEPARATE AN UPPER OILY PHASE AND A LOWER AQUEOUS PHENOL PHASE, WITHDRAWING THE AQUEOUS PHENOL PHASE AND COOLING IT SUFFICIENTLY TO CAUSE SEPARATION OF TWO LIQUID PHASES BUT NOT BELOW ABOUT 1* C. AND WITHDRAWING THE LOWER PHENOL-RICH PHASE.
Claim 2
Dependent Claim
103 words
A PROCESS FOR RECOVERING PHENOL FROM CUMENE HYDROPEROXIDE DECOMPOSITION MIXTURES WHICH COMPRISES FRACTIONALLY DISTILLING THE DECOMPOSITION MIXTURE TO SEPARATE AN ACETONERICH OVERHEAD FRACTION AND A PHENOL-RICH BOTTOMS FRACTION, MIXING THE BOTTOMS FRACTION WITH 50% TO 500% BY WEIGHT OF WATER BASED ON THE PHENOL CONTENT OF THE FRACTION IN A MIXING ZONE, SETTLING THE RESULTANT AQUEOUS MIXTURE AT A TEMPERATURE ABOVE 65* C. TO SEPARATE AN UPPER OILY PHASE AND A LOWER AQUEOUS PHENOL PHASE, WITHDRAWING THE AQUEOUS PHENOL PHASE AND COOLING IT SUFFICIENTLY TO CAUSE SEPARATION OF TWO LIQUID PHASES BUT NOT BELOW ABOUT 1* C. AND WITHDRAWING THE LOWER PHENOL-RICH PHASE.
References Cited (Backward Citations)
GB649286A
Cited
US2597497A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-24 | 1957-11-23 | 1958-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-24 | 1961-11-23 | 1962-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-24 | 1965-11-23 | 1966-05-25 | $7700.00 | Window Closed / Lapsed |