US4559183A
Expired / Lapsed
US
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Preparation of carboxylic acid anhydrides
Assignee: Halcon SD Group Inc
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Filing: 1984-08-27
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Granted: 1985-12-17
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Expires: 2004-08-27
Abstract
Abstract A carboxylic acid anhydride such as acetic anhydride, is prepared from a carboxylate ester or a hydrocarbyl ether in processes comprising the use of a halide, carbon monoxide and a Group VIII noble metal.
Inventors
- 👤 Colin Hewlett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:20
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/54; C07C51/56
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
97 words
A process for the preparation of an anhydride of an alkanoic monocarboxylic acid which comprises reacting a feed consisting essentially of an alkanoic carboxylate ester or an alkyl hydrocarbyl ether or a mixture of said ester and said ether with carbon monoxide and a halide which is an iodide under substantially anhydrous conditions in the presence of a rhodium catalyst and in the presence of an added promoter for said catalyst at a temperature of 20° to 500° C. and under a carbon monoxide partial pressure of 0.1 to 15,000 psig, said promoter being a lithium compound.
Claim 2
Dependent Claim
97 words
A process for the preparation of an anhydride of an alkanoic monocarboxylic acid which comprises reacting a feed consisting essentially of an alkanoic carboxylate ester or an alkyl hydrocarbyl ether or a mixture of said ester and said ether with carbon monoxide and a halide which is an iodide under substantially anhydrous conditions in the presence of a rhodium catalyst and in the presence of an added promoter for said catalyst at a temperature of 20° to 500° C. and under a carbon monoxide partial pressure of 0.1 to 15,000 psig, said promoter being a lithium compound.
Claim 3
Dependent Claim
93 words
A process for the preparation of an anhydride of an alkanoic monocarboxylic acid which comprises reacting a feed consisting essentially of an alkanoic carboxylate ester or an alkyl hydrocarbyl ether or a mixture of said ester and said ether with carbon monoxide and a halide which is an iodide under substantially anhydrous conditions in the presence of a rhodium catalyst and an added promoter for said catalyst at a temperature of 20° to 500° C. and under a carbon monoxide partial pressure of 0.1 to 15,000 psig, said promoter being a lithium salt.
Claim 4
Dependent Claim
93 words
A process for the preparation of an anhydride of an alkanoic monocarboxylic acid which comprises reacting a feed consisting essentially of an alkanoic carboxylate ester or an alkyl hydrocarbyl ether or a mixture of said ester and said ether with carbon monoxide and a halide which is an iodide under substantially anhydrous conditions in the presence of a rhodium catalyst and an added promoter for said catalyst at a temperature of 20° to 500° C. and under a carbon monoxide partial pressure of 0.1 to 15,000 psig, said promoter being a lithium salt.
Claim 5
Dependent Claim
18 words
A process as defined in claim 2, wherein said promoter is a lithium halide or a lithium carboxylate.
Claim 6
Dependent Claim
16 words
A process as defined in claim 3, wherein said promoter is lithium iodide or lithium acetate.
Claim 7
Dependent Claim
85 words
A process for the preparation of acetic anhydride acid which comprises reacting a feed consisting essentially of methyl acetate or dimethyl ether or a mixture of said ester and said ether with carbon monoxide and a halide which is methyl iodide under substantially anhydrous conditions in the presence of a rhodium catalyst and an added promoter for said catalyst at a temperature of 20° to 500° C. and under a carbon monoxide partial pressure of 0.1 to 15,000 psig, said promoter being a lithium compound.
Claim 8
Dependent Claim
85 words
A process for the preparation of acetic anhydride acid which comprises reacting a feed consisting essentially of methyl acetate or dimethyl ether or a mixture of said ester and said ether with carbon monoxide and a halide which is methyl iodide under substantially anhydrous conditions in the presence of a rhodium catalyst and an added promoter for said catalyst at a temperature of 20° to 500° C. and under a carbon monoxide partial pressure of 0.1 to 15,000 psig, said promoter being a lithium compound.
Claim 9
Dependent Claim
14 words
A process as defined in claim 5, wherein said promoter is a lithium salt.
Claim 10
Dependent Claim
18 words
A process as defined in claim 6, wherein said promoter is a lithium halide or a lithium carboxylate.
Claim 11
Dependent Claim
16 words
A process as defined in claim 7, wherein said promoter is lithium iodide or lithium acetate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-12-16 | 1989-06-17 | 1989-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-16 | 1993-06-17 | 1993-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-16 | 1997-06-17 | 1997-12-17 | $7700.00 | Window Closed / Lapsed |