Patent DE825645C successfully refreshed from Google Patents.
US4010171A
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Process for preparing tetrahydrofuran
Assignee: General Electric Co
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Filing: 1975-10-20
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Granted: 1977-03-01
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Expires: 1995-10-20
Abstract
Abstract A process for preparing tetrahydrofuran which comprises heating a carboxylic acid diester of 1,4-butanediol in the vapor phase in the presence of water and a hydrolysis-dehydroacyloxylation catalyst.
Inventors
- 👤 William Edward Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:54
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/02; C07D307/04; C07D307/06; C07D307/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
52 words
A process for preparing tetrahydrofuran which comprises heating a carboxylic acid diester of 1,4-butanediol in the vapor phase in the presence of water and a hydrolysis-dehydroacyloxylation catalyst selected from the group consisting of alumina, silica, silica-alumina, and silica-magnesia at a temperature in the range of from 200° C to about 325° C.
Claim 2
Dependent Claim
52 words
A process for preparing tetrahydrofuran which comprises heating a carboxylic acid diester of 1,4-butanediol in the vapor phase in the presence of water and a hydrolysis-dehydroacyloxylation catalyst selected from the group consisting of alumina, silica, silica-alumina, and silica-magnesia at a temperature in the range of from 200° C to about 325° C.
Claim 3
Dependent Claim
18 words
The process of claim 1 in which the carboxylic acid diester of 1,4-butanediol is the diacetate of 1,4-butanediol.
Claim 4
Dependent Claim
30 words
The process of claim 1 wherein the water is present in a ratio of from one to 30 moles of water per mole of the carboxylic acid diester of 1,4-butanediol.
References Cited (Backward Citations)
GB1170222A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-29 | 1980-08-30 | 1981-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-29 | 1984-08-30 | 1985-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-29 | 1988-08-30 | 1989-03-01 | $7700.00 | Window Closed / Lapsed |