Patent US4484002A successfully refreshed from Google Patents.
US4484002A
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Process for producing methyl acetate from methanol and carbon monoxide using a novel catalyst system
Assignee: Huntsman Corp
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Filing: 1982-01-13
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Granted: 1984-11-20
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Expires: 2002-01-13
Abstract
Abstract Methyl acetate is prepared in good yield by reacting methanol with carbon monoxide in the presence of a homogeneous catalyst composition comprising a ruthenium-containing compound, a cobalt-containing compound and a quaternary onium salt or base, and heating the resulting mixture at an elevated temperature and pressure for sufficient time to produce the desired methyl acetate, and then recovering the same from the reaction mixture.
Inventors
- 👤 Jiang-Jen Lin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:16
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/36
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
80 words
A process for preparing methyl acetate from methanol and carbon monoxide which comprises contacting a mixture of methanol and carbon monoxide with a catalytic amount of an iodide-free catalyst system which comprises an iodide-free ruthenium-containing compound, an iodide-free cobalt-containing compound and an iodide-free quaternary onium salt or base, heating the resulting mixture at a temperature above 100° C. and a superatmospheric pressure for sufficient time to produce the desired methyl acetate, and then recovering the same from the reaction mixture.
Claim 2
Dependent Claim
80 words
A process for preparing methyl acetate from methanol and carbon monoxide which comprises contacting a mixture of methanol and carbon monoxide with a catalytic amount of an iodide-free catalyst system which comprises an iodide-free ruthenium-containing compound, an iodide-free cobalt-containing compound and an iodide-free quaternary onium salt or base, heating the resulting mixture at a temperature above 100° C. and a superatmospheric pressure for sufficient time to produce the desired methyl acetate, and then recovering the same from the reaction mixture.
Claim 3
Dependent Claim
23 words
A process as in claim 1 wherein the said reaction mixture is heated at a temperature of from 150° C. to 350° C.
Claim 4
Dependent Claim
21 words
A process as in claim 1 wherein the process is conducted at a pressure between about 1000 psi and 7500 psi.
Claim 5
Dependent Claim
29 words
A process as in claim 1 wherein the ruthenium-containing compound is a member of the group consisting of oxides of ruthenium, ruthenium acetylacetonate, and ruthenium carbonyl and hydrocarbonyl compounds.
Claim 6
Dependent Claim
36 words
A process as in claim 1 wherein the ruthenium-containing compound is a member of the group consisting of anhydrous ruthenium(IV) dioxide, ruthenium (IV) dioxide hydrate, ruthenium(VIII) tetraoxide, ruthenium acetate, ruthenium propionate, ruthenium(III) acetylacetonate, and triruthenium dodecacarbonyl.
Claim 7
Dependent Claim
57 words
A process as in claim 1 wherein the cobalt-containing compound is a member of the group consisting of cobalt carbonyls and derivatives thereof obtained by reacting the carbonyls with a group V donor ligand, cobalt carbonyl hydrides, cobalt carbonyl halides, cobalt nitrosyl carbonyls, cycloalkadienyl cobalt carbonyls, cobalt halides, cobalt oxides, and cobalt salts of organic carboxylic acids.
Claim 8
Dependent Claim
18 words
A process as in claim 1 wherein the quaternary onium salt or base is a quaternary phosphonium salt.
Claim 9
Dependent Claim
18 words
A process as in claim 1 wherein the quaternary onium salt or base is a quaternary ammonium salt.
Claim 10
Dependent Claim
18 words
A process as in claim 1 wherein the quaternary onium salt or base is a tetrahydrocarbyl phosphonium salt.
Claim 11
Dependent Claim
17 words
A process as in claim 1 wherein the quaternary onium salt or base is a tetralkylphosphonium salt.
Claim 12
Dependent Claim
22 words
A process as in claim 10 wherein the tetralkylphosphonium salt is selected from the group consisting of tetralkylphosphonium bromides, chlorides, and chromates.
Claim 13
Dependent Claim
16 words
A process as in claim 1 wherein an oxygen-containing solvent is included in the reaction mixture.
Claim 14
Dependent Claim
12 words
A process as in claim 12 wherein the solvent is a dioxane.
Claim 15
Dependent Claim
38 words
A process as in claim 1 wherein the catalyst components are utilized in the following molar ratios: ruthenium-containing compound 0.1 to 4 moles; cobalt-containing compound 0.025 to 1.0 moles; quaternary onium salt or base 0.4 to 60 moles.
Claim 16
Dependent Claim
14 words
A process as in claim 1 wherein the ruthenium-containing compound is ruthenium dioxide hydrate.
Claim 17
Dependent Claim
13 words
A process as in claim 1 wherein the cobalt-containing compound is dicobalt octacarbonyl.
Claim 18
Dependent Claim
16 words
A process as in claim 1 wherein the quaternary onium salt or base is tetrabutylphosphonium bromide.
Claim 19
Dependent Claim
55 words
A process for preparing methyl acetate which comprises reacting methanol with carbon monoxide in the presence of an iodide-free catalyst system which comprises ruthenium oxide, a cobalt carbonyl and an iodide-free quaternary phosphonium salt at a temperature above 150° C. and superatmospheric pressure until the desired methyl acetate is formed and then recovering the same.
Claim 20
Dependent Claim
55 words
A process for preparing methyl acetate which comprises reacting methanol with carbon monoxide in the presence of an iodide-free catalyst system which comprises ruthenium oxide, a cobalt carbonyl and an iodide-free quaternary phosphonium salt at a temperature above 150° C. and superatmospheric pressure until the desired methyl acetate is formed and then recovering the same.
References Cited (Backward Citations)
US3769324A
Cited
US3856856A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-20 | 1988-05-21 | 1988-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-20 | 1992-05-21 | 1992-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-20 | 1996-05-21 | 1996-11-20 | $7700.00 | Window Closed / Lapsed |