US3932518A
Expired / Lapsed
US
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Methylation of cyclohexanone with simultaneous dehydrogenation
Assignee: Hoechst AG
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Filing: 1973-11-21
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Granted: 1976-01-13
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Expires: 1993-11-21
Abstract
Abstract Catalytic process for alkylating ketones carrying at least one methyl or methylene group in α-position to the carbonyl group by reacting them with primary alcohols in the presence of copper and/or silver catalysts.
Inventors
- 👤 Hans-Jurgen Arpe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:19
CPC Classifications
C; C07; C07C; C07C49/00; C07C49/385; C07C49/403; C07C37/00; C07C37/11; C07C37/20; C07C45/00; C07C45/61; C07C45/67; C07C45/68; C07C45/70; C07C45/71; C07C2601/00; C07C2601/12; C07C2601/14
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
105 words
A process for methylating cyclohexanone in α-position to the carbonyl group with simultaneous dehydrogenation in the gaseous phase in the presence of a catalyst consisting essentially of metallic copper supported on a carrier which comprises reacting cyclohexanone with methanol at a temperature from above 250° to 500°C with a residence time of less than 60 seconds and wherein the copper content of the catalyst is from 0.5 to 25 % by weight and the catalyst contains, as a promoter, oxides, hydroxides or alcoholates of potassium, didymium or mixtures of same in an amount from 0.01 to 10 % by weight, based on the copper catalyst.
Claim 2
Dependent Claim
105 words
A process for methylating cyclohexanone in α-position to the carbonyl group with simultaneous dehydrogenation in the gaseous phase in the presence of a catalyst consisting essentially of metallic copper supported on a carrier which comprises reacting cyclohexanone with methanol at a temperature from above 250° to 500°C with a residence time of less than 60 seconds and wherein the copper content of the catalyst is from 0.5 to 25 % by weight and the catalyst contains, as a promoter, oxides, hydroxides or alcoholates of potassium, didymium or mixtures of same in an amount from 0.01 to 10 % by weight, based on the copper catalyst.
Claim 3
Dependent Claim
23 words
The process as defined in claim 1, wherein the carrier is aluminum oxide, aluminum silicate, magnesium silicate, silica gel, carbon, zeolites and pumice.
References Cited (Backward Citations)
US2697730A
Cited
US2725400A
Cited
US2064254A
Cited
US2549520A
Cited
US3047630A
Cited
US3114772A
Cited
US3668255A
Cited
US3781307A
Cited
US3673255A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-12 | 1979-07-14 | 1980-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-12 | 1983-07-14 | 1984-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-12 | 1987-07-14 | 1988-01-13 | $7700.00 | Window Closed / Lapsed |