US4308407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical process
Assignee: Albemarle Corp
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Filing: 1980-08-18
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Granted: 1981-12-29
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Expires: 2000-08-18
Abstract
Abstract Phenols with a methyl group substituted on the phenolic benzene ring, such as 2,6-di-tert-butyl-p-cresol, can be produced by reacting a halomethyl group substituted on a phenol such as 2,6-di-tert-butyl-4-chloromethylphenol, with hydrogen in the presence of a hydrogenation catalyst, such as palladium.
Inventors
- 👤 Bernard R. Meltsner
- 👤 Joseph D. Odenweller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:47
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/001; C07C37/002
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
49 words
A process for converting a halomethyl phenol to a cresol, said process comprising contacting said halomethyl phenol with hydrogen in the presence of a hydrogenation catalyst at a pressure of from atmospheric to about 3000 psig and at a temperature of from about 25° C. to about 300° C.
Claim 2
Dependent Claim
49 words
A process for converting a halomethyl phenol to a cresol, said process comprising contacting said halomethyl phenol with hydrogen in the presence of a hydrogenation catalyst at a pressure of from atmospheric to about 3000 psig and at a temperature of from about 25° C. to about 300° C.
Claim 3
Dependent Claim
13 words
A process of claim 1 wherein said halomethyl phenol is a chloromethyl phenol.
Claim 4
Dependent Claim
25 words
A process of claim 2 wherein said hydrogenation catalyst is selected from the group consisting of Group VIII metals, chromium and molybdenum and compounds thereof.
Claim 5
Dependent Claim
11 words
A process of claim 3 wherein said hydrogenation catalyst is palladium.
Claim 6
Dependent Claim
92 words
A process of claim 1 for making a dihydrocarbyl cresol by contacting a dihydrocarbyl chloromethyl phenol having the structure: ##STR2## wherein R' and R" are selected from the group consisting of alkyl containing 1 to 20 carbon atoms, cycloalkyl containing 5 to 8 carbon atoms, aralkyl containing 7 to 20 carbon atoms and aryl containing 6 to 20 carbon atoms, with hydrogen in the presence of a hydrogenation catalyst at a pressure of from atmospheric to about 3000 psig and at a temperature of from about 25° C. to about 300° C.
Claim 7
Dependent Claim
25 words
A process of claim 5 wherein said hydrogenation catalyst is selected from the group consisting of Group VIII metals, chromium and molybdenum and compounds thereof.
Claim 8
Dependent Claim
11 words
A process of claim 6 wherein said hydrogenation catalyst is palladium.
Claim 9
Dependent Claim
14 words
A process of claim 5 wherein said dihydrocarbyl chloromethyl phenol is a 2,6-di-alkyl-4-chloromethyl phenol.
Claim 10
Dependent Claim
25 words
A process of claim 8 wherein said hydrogenation catalyst is selected from the group consisting of Group VIII metals, chromium and molybdenum and compounds thereof.
Claim 11
Dependent Claim
11 words
A process of claim 9 wherein said hydrogenation catalyst is palladium.
Claim 12
Dependent Claim
12 words
A process of claim 8 wherein said 2,6-di-alkyl-4-chloromethyl phenol is 2,6-di-tert-butyl-4-chloromethyl phenol.
Claim 13
Dependent Claim
25 words
A process of claim 11 wherein said hydrogenation catalyst is selected from the group consisting of Group VIII metals, chromium and molybdenum and compounds thereof.
Claim 14
Dependent Claim
11 words
A process of claim 12 wherein said hydrogenation catalyst is palladium.
References Cited (Backward Citations)
US3030428A
Cited
US2576161A
Cited
US2725402A
Cited
US2803669A
Cited
US3006969A
Cited
US2841624A
Cited
US4072724A
Cited
US4117244A
Cited
US4228308A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-28 | 1985-06-29 | 1985-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-28 | 1989-06-29 | 1989-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-28 | 1993-06-29 | 1993-12-29 | $7700.00 | Window Closed / Lapsed |