US2720549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of phenol
Assignee: —
•
Filing: —
•
Granted: 1955-10-11
•
Expires: 1972-10-11
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:20
CPC Classifications
C; C07; C07C; C07C39/00; C07C39/02; C07C39/04; C07C37/00; C07C37/68; C07C37/70; C07C37/74
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A PROCESS FOR THE RECOVERY OF PURE PHENOL FROM A MIXTURE CONTAINING PHENOL AND OBTAINED THROUGH ACIDIC CATALYTIC DECOMPOSITION OF ISOPROPYLBENZENE HYDROPEROXIDE WHICH COMPRISES FRACTIONALLY DISTILLING SAID MIXTURE TO REMOVE THE MAJOR PART OF THE PHENOL, THE DISTILLATION OF THE PHENOL BEING INTERRUPTED WHEN THE RATIO OF PHENOL TO PHENYLDIMETHYL CARBINOL IN THE STILL IS A VALUE VARYING FROM 5:1 IN ATMOSHPERIC PRESSURE DISTILLATION DOWN TO 0.7:1 IN DISTILLATION UNDER A PRESSURE OF 10 MM. OF MERCURY, THEREBY LEAVING SUFFICIENT PHENOL IN THE DISTILLATION RESIDUE TO PREVENT APPRECIABLE DEHYDRATION OF THE PHENYLDIMETHYL CARBINOL ALSO PRESENT THEREIN.
Claim 2
Dependent Claim
96 words
A PROCESS FOR THE RECOVERY OF PURE PHENOL FROM A MIXTURE CONTAINING PHENOL AND OBTAINED THROUGH ACIDIC CATALYTIC DECOMPOSITION OF ISOPROPYLBENZENE HYDROPEROXIDE WHICH COMPRISES FRACTIONALLY DISTILLING SAID MIXTURE TO REMOVE THE MAJOR PART OF THE PHENOL, THE DISTILLATION OF THE PHENOL BEING INTERRUPTED WHEN THE RATIO OF PHENOL TO PHENYLDIMETHYL CARBINOL IN THE STILL IS A VALUE VARYING FROM 5:1 IN ATMOSHPERIC PRESSURE DISTILLATION DOWN TO 0.7:1 IN DISTILLATION UNDER A PRESSURE OF 10 MM. OF MERCURY, THEREBY LEAVING SUFFICIENT PHENOL IN THE DISTILLATION RESIDUE TO PREVENT APPRECIABLE DEHYDRATION OF THE PHENYLDIMETHYL CARBINOL ALSO PRESENT THEREIN.
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) | 1958-10-10 | 1959-04-11 | 1959-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-10 | 1963-04-11 | 1963-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-10 | 1967-04-11 | 1967-10-11 | $7700.00 | Window Closed / Lapsed |