US2573244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of phenol from dilute aqueous solutions
Assignee: Lummus Technology LLC
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Filing: 1949-04-06
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Granted: 1951-10-30
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Expires: 1969-04-06
Abstract
No abstract record available.
Inventors
- 👤 Marcel J P Bogart
- 👤 Austin S Brunjes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:12
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/68; C07C37/70; C07C37/74
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
THE METHOD OF CONCENTRATING AN AQUEOUS PHENOL SOLUTION CONTAINING LESS THAN THE AZEOTROPE PROPORTION OF PHENOL AT ATMOSPHERIC PRESSURE WHICH COMPRISES FRACTIONALLY DISTILLING SAID DILUTE PHENOL SOLUTION IN A RECTIFICATION ZONE HEATED BY INDIRECT HEAT EXCHANGE IN THE PRESENCE OF SODIUM CHLORIDE BRINE IN ALL PARTS OF THE ZONE IS UNDER A SUPER ATMOSPHERIC PRESSURE OF AT LEAST THREE ATMOSPHERES TO PRODUCE A VAPOROUS OVERHEAD OF WATER AND PHENOL CONTAINING SUBSTANTIALLY MORE PHENOL THAN THE BINARY AZEOTROPIC PROPORTIONS OF PHENOL-WATER, CONDESNING SAID VAPORS AND SETTLING SAID CONDENSATE FOR SUFFICIENT TIME TO PRODUCE A SATURATED WATER-RICH LAYER AND A SATURATED PHENOL-RICH LAYER, RETURNING SAID SATURATED WATER-RICH LAYER TO THE TOP OF THE RECTIFICATION ZONE AND WITHDRAWING THE SATURATED PHENOL-RICH LAYER.
Claim 2
Independent Claim
119 words
THE METHOD OF CONCENTRATING AN AQUEOUS PHENOL SOLUTION CONTAINING LESS THAN THE AZEOTROPE PROPORTION OF PHENOL AT ATMOSPHERIC PRESSURE WHICH COMPRISES FRACTIONALLY DISTILLING SAID DILUTE PHENOL SOLUTION IN A RECTIFICATION ZONE HEATED BY INDIRECT HEAT EXCHANGE IN THE PRESENCE OF SODIUM CHLORIDE BRINE IN ALL PARTS OF THE ZONE IS UNDER A SUPER ATMOSPHERIC PRESSURE OF AT LEAST THREE ATMOSPHERES TO PRODUCE A VAPOROUS OVERHEAD OF WATER AND PHENOL CONTAINING SUBSTANTIALLY MORE PHENOL THAN THE BINARY AZEOTROPIC PROPORTIONS OF PHENOL-WATER, CONDESNING SAID VAPORS AND SETTLING SAID CONDENSATE FOR SUFFICIENT TIME TO PRODUCE A SATURATED WATER-RICH LAYER AND A SATURATED PHENOL-RICH LAYER, RETURNING SAID SATURATED WATER-RICH LAYER TO THE TOP OF THE RECTIFICATION ZONE AND WITHDRAWING THE SATURATED PHENOL-RICH LAYER.
References Cited (Backward Citations)
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US1911832A
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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) | 1954-10-29 | 1955-04-30 | 1955-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-29 | 1959-04-30 | 1959-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-29 | 1963-04-30 | 1963-10-30 | $7700.00 | Window Closed / Lapsed |