US4062884A
Expired / Lapsed
US
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Process for the preparation of dialkylcarbonates
Assignee: ENICHEM SYNTHESIS SpA AN ITALIAN Co
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Filing: 1976-04-08
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Granted: 1977-12-13
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Expires: 1996-04-08
Abstract
Abstract A process for the preparation of dialkylcarbonates by reacting an alcohol with a cyclic carbonate, wherein the reaction is carried out in the presence of an organic base, preferably a tertiary aliphatic amine, at a temperature of between 50° and 150° C and at a pressure of between 0.1 and 10 kg./sq.cm., the conversion of dialkylcarbonate being selective and avoiding the need of removing inorganic by-products.
Inventors
- 👤 Ugo Romano
- 👤 Ugo Melis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:24
CPC Classifications
C; C07; C07C; C07C68/00; C07C68/06; C07C68/065
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
68 words
A process for the preparation of a dialkylcarbonate, which consists in reacting an alcohol with a cyclic carbonate having the formula: ##STR2## in which R and R' represent hydrogen, alkyl or alkoxy, in the in the presence of a catalyst consisting of a tertiary aliphatic amine in the temperature range of from 50° to 150° C and in the pressure of from 0.1 to 10 kg/cm 2 .
Claim 2
Dependent Claim
68 words
A process for the preparation of a dialkylcarbonate, which consists in reacting an alcohol with a cyclic carbonate having the formula: ##STR2## in which R and R' represent hydrogen, alkyl or alkoxy, in the in the presence of a catalyst consisting of a tertiary aliphatic amine in the temperature range of from 50° to 150° C and in the pressure of from 0.1 to 10 kg/cm 2 .
Claim 3
Dependent Claim
42 words
A process for the preparation of a dialkylcarbonate as claimed in claim 1, characterized in that the reaction is carried out in the presence of an amount of catalyst in the range between 0.1 and 20% by weight referred to the feed.
Claim 4
Dependent Claim
14 words
A process as defined in claim 1 wherein the tertiary aliphatic amine is triethylamine.
Claim 5
Dependent Claim
14 words
A process as defined in claim 1 wherein the tertiary aliphatic amine is dimethylbenzylamine.
Claim 6
Dependent Claim
14 words
A process as defined in claim 1 wherein the tertiary aliphatic amine in triethanolamine.
Claim 7
Dependent Claim
14 words
A process as defined in claim 1 wherein the tertiary aliphatic amine is tributylamine.
References Cited (Backward Citations)
US3248414A
Cited
US3642858A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-12 | 1981-06-13 | 1981-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-12 | 1985-06-13 | 1985-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-12 | 1989-06-13 | 1989-12-13 | $7700.00 | Window Closed / Lapsed |