US4996374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrogenation of acetophenone
Assignee: Lyondell Chemical Technology LP
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Filing: 1989-12-15
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Granted: 1991-02-26
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Expires: 2009-12-15
Abstract
Abstract A process for the hydrogenation of ACP to MBA over a supported palladium catalyst wherein a solvent comprised of ethylbenzene and/or MBA is employed and a small amount of water effective to suppress catalyst deactivation is incorporated in the feed. A further improvement comprises maintaining hydrogen pressure on the catalyst during and between hydrogenation runs.
Inventors
- 👤 Shaw-Chan Lin
- 👤 Robert N. Cochran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:28
CPC Classifications
C; C07; C07C; C07C33/00; C07C33/18; C07C33/20; C07C29/00; C07C29/132; C07C29/136; C07C29/143; C07C29/145
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
75 words
The process for the hydrogenation of acetophenone to alpha-methyl benzyl alcohol which comprises contacting a mixture of acetophenone and a solvent comprised of ethylbenzene and/or alpha-methyl benzyl alcohol with hydrogen and a catalyst comprised of palladium supported or carbon or alumina at hydrogenation conditions of 20° to 50° C. and at least 5 psig hydrogen pressure, said mixture also containing 1 to 5 weight percent of water effective to reduce the rate of catalyst deactivation.
Claim 2
Dependent Claim
75 words
The process for the hydrogenation of acetophenone to alpha-methyl benzyl alcohol which comprises contacting a mixture of acetophenone and a solvent comprised of ethylbenzene and/or alpha-methyl benzyl alcohol with hydrogen and a catalyst comprised of palladium supported or carbon or alumina at hydrogenation conditions of 20° to 50° C. and at least 5 psig hydrogen pressure, said mixture also containing 1 to 5 weight percent of water effective to reduce the rate of catalyst deactivation.
Claim 3
Dependent Claim
21 words
The method of claim 1 wherein a substantial hydrogen pressure is continuously maintained in the catalyst during and between hydrogenation runs.
Claim 4
Dependent Claim
14 words
The method of claim 1 wherein the catalyst is a palladium on carbon catalyst.
Claim 5
Dependent Claim
10 words
The method of claim 1 wherein the solvent is ethylbenzene.
Claim 6
Dependent Claim
12 words
The method of claim 1 wherein the solvent is alpha-methyl benzyl alcohol.
Claim 7
Dependent Claim
17 words
The method of claim 1 wherein the solvent is a mixture of ethylbenzene and alpha-methyl benzyl alcohol.
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) | 1994-02-25 | 1994-08-27 | 1995-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-25 | 1998-08-27 | 1999-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-25 | 2002-08-27 | 2003-02-26 | $7700.00 | Window Closed / Lapsed |