US3979464A
Expired / Lapsed
US
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Methylation of 2,6-xylenol to produce 2,3,6-trimethylphenol
Assignee: ConocoPhillips Co
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Filing: 1975-08-25
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Granted: 1976-09-07
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Expires: 1995-08-25
Abstract
Abstract 2,6-xylenol is methylated to yield 2,3,6-trimethylphenol in high selectivity in a liquid phase reaction controlled in temperature, pressure, and reactor residence time.
Inventors
- 👤 Bruce E. Leach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:02
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/11; C07C37/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
79 words
In a process for the liquid phase methylation of 2,6-xylenol to form 2,3,6-trimethylphenol in contact with alumina catalysts, the improvement comprising: a. contacting 2,6-xylenol with methanol in liquid phase, b. at a temperature of from about 300°C to about 390°C, c. at a pressure at from about 350 psig to about 500 psig, d. at a liquid hourly space velocity of from about 1 to about 15 while in contact with an alumina catalyst derived from aluminum alkoxide hydrolysis.
Claim 2
Dependent Claim
79 words
In a process for the liquid phase methylation of 2,6-xylenol to form 2,3,6-trimethylphenol in contact with alumina catalysts, the improvement comprising: a. contacting 2,6-xylenol with methanol in liquid phase, b. at a temperature of from about 300°C to about 390°C, c. at a pressure at from about 350 psig to about 500 psig, d. at a liquid hourly space velocity of from about 1 to about 15 while in contact with an alumina catalyst derived from aluminum alkoxide hydrolysis.
Claim 3
Dependent Claim
18 words
A process as described in Claim 1 wherein the reaction is carried out in a continuous flow reactor.
Claim 4
Dependent Claim
17 words
A process described in claim 2 wherein the residence time is from 1 to about 60 seconds.
Claim 5
Dependent Claim
16 words
A process as described in claim 1 wherein the temperature is from about 330°to about 375°C.
Claim 6
Dependent Claim
20 words
A process as described in claim 1 wherein the liquid hourly space velocity is from about 2 to about 6.
Claim 7
Dependent Claim
26 words
A process as described in claim 1 wherein water is maintained substantially in the vapor phase and cresylic acid is maintained substantially in the liquid phase.
Claim 8
Dependent Claim
18 words
A process as described in claim 1 wherein the unreacted 2,6-xylenol is recovered and reused as a feedstock.
Claim 9
Dependent Claim
19 words
A process as described in Claim 1 wherein the methanol/2,6-xylenol mole ratio is from about 0.1 to about 1.0.
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) | 1979-09-07 | 1980-03-08 | 1980-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-07 | 1984-03-08 | 1984-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-07 | 1988-03-08 | 1988-09-07 | $7700.00 | Window Closed / Lapsed |