Patent US3971832A successfully refreshed from Google Patents.
US3971832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing ortho-methylphenols
Assignee: Mitsubishi Chemical Corp
•
Filing: 1974-04-10
•
Granted: 1976-07-27
•
Expires: 1994-04-10
Abstract
Abstract In a process for methylation of phenols having at least one ortho-positioned hydrogen with methanol in the vapor phase, the methylation is catalytically carried out in the presence of a manganese oxide catalyst to produce ortho-methylphenols.
Inventors
- 👤 Yoshihisa Watanabe
- 👤 Makoto Takeda
- 👤 Makoto Imanari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:33
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/16; B01J23/32; B01J23/34; C; C07; C07C; C07C37/00; C07C37/11; C07C37/16
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
76 words
A process for the ortho-methylation of phenols selected from the group consisting of phenol, o-cresol, m-cresol, 2,3-xylenol, and 2,5-xylenol with methanol in the vapor phase, to produce o-methylphenols which comprises contacting the vaporized phenol with methyl alcohol at a temperature in the range 250°C to 500°C in the presence of an orthomethylating catalyst, the catalytic active of which essentially consists of a pre-baked trimanganese tetroxide previously baked at a temperature in the range 950°C to 1500°C.
Claim 2
Dependent Claim
76 words
A process for the ortho-methylation of phenols selected from the group consisting of phenol, o-cresol, m-cresol, 2,3-xylenol, and 2,5-xylenol with methanol in the vapor phase, to produce o-methylphenols which comprises contacting the vaporized phenol with methyl alcohol at a temperature in the range 250°C to 500°C in the presence of an orthomethylating catalyst, the catalytic active of which essentially consists of a pre-baked trimanganese tetroxide previously baked at a temperature in the range 950°C to 1500°C.
Claim 3
Dependent Claim
39 words
A process according to claim 1 in which said phenol is selected from the group consisting of phenol, O-cresol, m-cresol, p-cresol, 2, 3-xylenol, 2, 4-xylenol, 2, 5-xylenol, 2, 3, 4-trimethylphenol, 2, 3, 5-trimethylphenol, 3, 4, 5-trimethylphenol, and bisphenol A.
Claim 4
Dependent Claim
27 words
A process according to claim 1 in which the quantity of said methanol is from 1 to 30 moles per ortho-position of the phenol to be methylated.
Claim 5
Dependent Claim
57 words
A process according to claim 1 for producing 2, 6-xylenol which comprises reacting a phenol selected from the group consisting of phenol and O-cresol with from 1 to 30 moles of methanol per mole of ortho-phenol in contact with a catalyst composed essentially of trimanganese tetroxide in vapor phase at a temperature of from 250° to 500°C.
References Cited (Backward Citations)
US2448942A
Cited
GB717588A
Cited
GB1131940A
Cited
US3857899A
Cited
US3716589A
Cited
DE2127083A1
Cited
US3855318A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-27 | 1980-01-26 | 1980-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-27 | 1984-01-26 | 1984-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-27 | 1988-01-26 | 1988-07-27 | $7700.00 | Window Closed / Lapsed |