Patent US4360477A successfully refreshed from Google Patents.
US4360477A
Expired / Lapsed
US
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Carbonylation of alkanols
Assignee: General Electric Co
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Filing: 1981-11-09
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Granted: 1982-11-23
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Expires: 2001-11-09
Abstract
Abstract Alkanols can be carbonylated with carbon monoxide and oxygen at elevated temperatures in the presence of certain copper salts to form dialkyl carbonates. The invention also covers the carbonylation by recycling of the azeotropic mixture of methanol and the corresponding dimethyl carbonate.
Inventors
- 👤 John E. Hallgren
- 👤 Gary M. Lucas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:53
CPC Classifications
C; C07; C07C; C07C68/00; C07C68/01
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
70 words
A process for the production of dialkyl carbonate from alkanols in accordance with the following reaction: ##STR1## where R is selected from the class consisting of methyl, ethyl, propyl, isopropyl, and butyls, comprising reacting the alkanol, carbon monoxide, and oxygen at a temperature above 170° C. and at elevated pressures in the presence of from 0.02 to 1.5%, by weight, cupric halide catalyst, based on the weight of the alkanol.
Claim 2
Dependent Claim
70 words
A process for the production of dialkyl carbonate from alkanols in accordance with the following reaction: ##STR1## where R is selected from the class consisting of methyl, ethyl, propyl, isopropyl, and butyls, comprising reacting the alkanol, carbon monoxide, and oxygen at a temperature above 170° C. and at elevated pressures in the presence of from 0.02 to 1.5%, by weight, cupric halide catalyst, based on the weight of the alkanol.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein the copper catalyst is selected from the class consisting of cupric chloride and cupric bromide.
Claim 4
Dependent Claim
15 words
The process of claim 1 wherein the reaction temperature is from 180° to 300° C.
Claim 5
Dependent Claim
9 words
The process of claim 1 wherein R is methyl.
Claim 6
Dependent Claim
18 words
The process of claim 1 wherein the copper catalyst is recovered from the reaction mixture and is recycled.
Claim 7
Dependent Claim
39 words
A process for preparing dimethyl carbonate, comprising reacting, at a temperature about 170° C. and at elevated pressures in the presence of a cupric halide catalyst, an azeotropic mixture of dimethyl carbonate and methanol with carbon monoxide and oxygen.
Claim 8
Dependent Claim
39 words
A process for preparing dimethyl carbonate, comprising reacting, at a temperature about 170° C. and at elevated pressures in the presence of a cupric halide catalyst, an azeotropic mixture of dimethyl carbonate and methanol with carbon monoxide and oxygen.
Claim 9
Dependent Claim
21 words
The process of claim 6 wherein the cupric catalyst is selected from the class consisting of cupric chloride and cupric bromide.
Claim 10
Dependent Claim
15 words
The process of claim 7 wherein the reaction temperature is from 180° to 300° C.
Claim 11
Dependent Claim
19 words
The process of claim 7 wherein the cupric halide catalyst is recovered from the reaction mixture and is recycled.
References Cited (Backward Citations)
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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) | 1985-11-22 | 1986-05-24 | 1986-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-22 | 1990-05-24 | 1990-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-22 | 1994-05-24 | 1994-11-23 | $7700.00 | Window Closed / Lapsed |