US4237324A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of monoglycols from alkylene carbonates
Assignee: Dow Chemical Co
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Filing: 1979-01-22
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Granted: 1980-12-02
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Expires: 1999-01-22
Abstract
Abstract Alkylene glycols are produced from alkylene carbonates by hydrolysis in the presence of water at temperatures of from about 80° to about 200° C. Catalysts, such as alumina, are employed at temperatures from 80° to about 150° C. and only slightly greater than the stoichiometric amount of water is employed to allow the most efficient use of the process.
Inventors
- 👤 Dale A. Raines
- 👤 Oliver C. Ainsworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:57
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/09; C07C29/095
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
46 words
A process for the production of a monoglycol by hydrolyzing an alkylene carbonate which comprises reacting at least about stoichiometric amounts of water and an alkylene carbonate at a temperature of from about 80° C. to about 200° C., in the presence of alumina as catalyst.
Claim 2
Dependent Claim
46 words
A process for the production of a monoglycol by hydrolyzing an alkylene carbonate which comprises reacting at least about stoichiometric amounts of water and an alkylene carbonate at a temperature of from about 80° C. to about 200° C., in the presence of alumina as catalyst.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein the reaction time is at least about 30 minutes.
Claim 4
Dependent Claim
14 words
The process of claim 1 wherein at least about 10 psig pressure is employed.
Claim 5
Dependent Claim
10 words
The process of claim 1 wherein the process is continuous.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-02 | 1984-06-02 | 1984-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-02 | 1988-06-02 | 1988-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-02 | 1992-06-02 | 1992-12-02 | $7700.00 | Window Closed / Lapsed |