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US4060561A
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Method for the preparation of trimethylhydroquinone
Assignee: ConocoPhillips Co
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Filing: 1976-09-20
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Granted: 1977-11-29
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Expires: 1996-09-20
Abstract
Abstract Trimethylhydroquinone is prepared by reacting 4-methoxyphenol with methanol over MgO or MgO promoted with oxides of aluminum, uranium, titanium, cerium, manganese, zinc, and iron at temperatures of from about 350° C to about 550° C and pressures up to about 1,000 pounds per square inch gauge.
Inventors
- 👤 Charles M. Starks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:07
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/11; C07C37/16
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
46 words
A method for the production of trimethyhydroquinone comprising reacting 4-methoxyphenol with methanol over catalysts selected from the group consisting of magnesium oxide and aluminum oxide at temperatures of from about 350° C to about 550° C at pressures of from about atmospheric to about 1,000 psig.
Claim 2
Independent Claim
46 words
A method for the production of trimethyhydroquinone comprising reacting 4-methoxyphenol with methanol over catalysts selected from the group consisting of magnesium oxide and aluminum oxide at temperatures of from about 350° C to about 550° C at pressures of from about atmospheric to about 1,000 psig.
Claim 3
Dependent Claim
24 words
A method as described in claim 1 above wherein addition the catalysts are promoted with oxides of uranium, titanium, cerium, manganese, zinc and iron.
Claim 4
Dependent Claim
19 words
A method as described in claim 2 above wherein the 4-methoxyphenol contains up to about 25 weight percent hydroquinone.
Claim 5
Dependent Claim
22 words
A method as described in claim 2 wherein the mole ratio of 4-methoxyphenol to methanol ranges from about 0.05 to about 4.
Claim 6
Dependent Claim
18 words
A method as described in claim 4 wherein the reaction is carried out in a continuous flow reactor.
Claim 7
Dependent Claim
17 words
A method as described in claim 5 wherein the LHSV is from about 0.1 to about 50.
Claim 8
Dependent Claim
22 words
A method as described in claim 2 wherein the by-products of the reaction are separated and recycled for inclusion with 4-methoxyphenol feed.
Claim 9
Dependent Claim
26 words
A method as described in claim 2 wherein up to about 15 weight percent water is present in the feed, based upon the total feed weight.
Claim 10
Dependent Claim
33 words
A method as described in claim 2 wherein the trimethylhydroquinone produced in 2,3,6-trimethylhydroquinone, the catalyst is magnesium oxide, the reaction pressure is from about 200 to about 500 pounds per square inch gauge.
Claim 11
Dependent Claim
26 words
A method as described in claim 9 wherein the reaction is carried out continuously at a liquid hourly space velocity from about .2 to about 10.
Claim 12
Dependent Claim
27 words
A method as described in claim 10 wherein in addition the feed stream contains up to about 15 weight percent water based upon the total feed weight.
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) | 1980-11-28 | 1981-05-30 | 1981-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-28 | 1985-05-30 | 1985-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-28 | 1989-05-30 | 1989-11-29 | $7700.00 | Window Closed / Lapsed |