US3234291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthesis of phenols
Assignee: Pullman Inc
•
Filing: 1962-07-06
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Granted: 1966-02-08
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Expires: 1982-07-06
Abstract
No abstract record available.
Inventors
- 👤 Arthur W Kelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:25
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/01; C07C37/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
158 words
IN A PROCESS FOR PRODUCING A PHENOL WHEREIN A MONOHALOBENZENE IS HYDROLYZED WITH STEAM IN THE VAPOR PHASE TO PRODUCE A VAPOROUS EFFLUENT CONTAINING THE PHENOL, A HYDROGEN HALIDE AND WATER, THE IMPROVEMENT WHICH COMPRISES: PASSING THE VAPOROUS HYDROLYSIS EFFLUENT TO AN ABSORPTION ZONE; REFLUXING THE ABSORPTION ZONE WITH MONOHALOBENZENE; MAINTAINING THE TEMPERATURE IN THE ABSORPTION ZONE ABOVE THE DEW POINT OF THE WATER-HYDROGEN HALIDE MIXTURE AND BELOW THE CONDENSATION TEMPERATURE OF THE PHENOL; CONDENSING SUBSTANTIALLY ALL OF THE PHENOL AND A PORTION OF THE MONOHALOBENZENE IN THE ABSORPTION ZONE; PASSING THE VAPOROUR MIXTURE OF HYDROGEN HALIDEWATER AND MONOHALOBENZENE TO A RECOVERY ZONE MAINTAINED ABOVE THE DEW POINT OF THE WATER-HYDROGEN HALIDE MIXTURE AND BELOW THE CONDENSATION TEMPERATURE OF THE MONOHALOBENZENE; REFLUXING THE RECOVERY ZONE WITH A BENZENE HAVING THE SAME NUMBER OF CARBON ATOMS AS THE MONOHALOBENZENE; CONDENSING A MAJOR PORTION OF THE MONOHALOBENZENE IN THE RECOVERY ZONE AND USING SAID CONDENATE TO REFLUX SAID ABSORPTION ZONE.
Claim 2
Dependent Claim
158 words
IN A PROCESS FOR PRODUCING A PHENOL WHEREIN A MONOHALOBENZENE IS HYDROLYZED WITH STEAM IN THE VAPOR PHASE TO PRODUCE A VAPOROUS EFFLUENT CONTAINING THE PHENOL, A HYDROGEN HALIDE AND WATER, THE IMPROVEMENT WHICH COMPRISES: PASSING THE VAPOROUS HYDROLYSIS EFFLUENT TO AN ABSORPTION ZONE; REFLUXING THE ABSORPTION ZONE WITH MONOHALOBENZENE; MAINTAINING THE TEMPERATURE IN THE ABSORPTION ZONE ABOVE THE DEW POINT OF THE WATER-HYDROGEN HALIDE MIXTURE AND BELOW THE CONDENSATION TEMPERATURE OF THE PHENOL; CONDENSING SUBSTANTIALLY ALL OF THE PHENOL AND A PORTION OF THE MONOHALOBENZENE IN THE ABSORPTION ZONE; PASSING THE VAPOROUR MIXTURE OF HYDROGEN HALIDEWATER AND MONOHALOBENZENE TO A RECOVERY ZONE MAINTAINED ABOVE THE DEW POINT OF THE WATER-HYDROGEN HALIDE MIXTURE AND BELOW THE CONDENSATION TEMPERATURE OF THE MONOHALOBENZENE; REFLUXING THE RECOVERY ZONE WITH A BENZENE HAVING THE SAME NUMBER OF CARBON ATOMS AS THE MONOHALOBENZENE; CONDENSING A MAJOR PORTION OF THE MONOHALOBENZENE IN THE RECOVERY ZONE AND USING SAID CONDENATE TO REFLUX SAID ABSORPTION ZONE.
References Cited (Backward Citations)
DE718454C
Cited
US2988573A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-07 | 1969-08-09 | 1970-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-07 | 1973-08-09 | 1974-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-07 | 1977-08-09 | 1978-02-08 | $7700.00 | Window Closed / Lapsed |