Patent US4252741A successfully refreshed from Google Patents.
US4252741A
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Carbonylation with Group VIII noble metal catalysts
Assignee: Halcon Research and Development Corp
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Filing: 1978-10-06
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Granted: 1981-02-24
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Expires: 1998-10-06
Abstract
Abstract In the carbonylation of alkyl esters in the presence of a Group VIII noble metal catalyst to produce a reaction mixture comprising volatile components and the non-volatile Group VIII noble metal catalyst, and the volatile components are separated from the catalyst, catalyst activity is maintained by providing a partial pressure of hydrogen of at least 10 psi during the separation of the volatile products. A partial pressure of at least 15 psi of carbon monoxide is also preferably provided, particularly when a metal promoter for the Group VIII noble metal catalyst is present, during such separation.
Inventors
- 👤 Richard V. Porcelli
- 👤 Vijay S. Bhise
- 👤 Arnold J. Shapiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:58
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/54; C07C51/56
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
73 words
In the carbonylation of alkyl esters in the presence of a Group VIII noble metal catalyst wherein there is produced a reaction product comprising volatile components and the non-volatile Group VIII noble metal catalyst, and the volatile components are separated from said catalyst, the improvement which comprises providing a hydrogen partial pressure of at least 10 psi during the separation of the volatile products in the zone in which said separation is effected.
Claim 2
Dependent Claim
73 words
In the carbonylation of alkyl esters in the presence of a Group VIII noble metal catalyst wherein there is produced a reaction product comprising volatile components and the non-volatile Group VIII noble metal catalyst, and the volatile components are separated from said catalyst, the improvement which comprises providing a hydrogen partial pressure of at least 10 psi during the separation of the volatile products in the zone in which said separation is effected.
Claim 3
Dependent Claim
33 words
A process as defined in claim 1, wherein the Group VIII noble metal catalyst includes a metal promoter and a partial pressure of at least 15 psi of carbon monoxide is also applied.
Claim 4
Dependent Claim
25 words
A process as defined in claim 1, wherein the alkyl ester is methyl acetate and the Group VIII noble metal catalyst comprises rhodium and/or palladium.
Claim 5
Dependent Claim
21 words
A process as defined in claim 1, wherein the hydrogen partial pressure is in the range of 10 to 250 psi.
Claim 6
Dependent Claim
22 words
A process as defined in claim 2, wherein the carbon monoxide partial pressure is in the range of 15 to 250 psi.
References Cited (Backward Citations)
US4115444A
Cited
US4002677A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |