Patent US4011244A successfully refreshed from Google Patents.
US4011244A
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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: 1977-03-08
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Expires: 1995-10-20
Abstract
Abstract A process for preparing tetrahydrofuran which comprises heating a carboxylic acid monoester of 1,4-butanediol in the vapor phase in the presence of a dehydroacyloxylation catalyst.
Inventors
- 👤 William Edward Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:28
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/02; C07D307/04; C07D307/06; C07D307/08
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
54 words
A process for preparing tetrahydrofuran which comprises heating a carboxylic acid monoester of 1,4-butanediol in the vapor phase in the presence of a dehydroacyloxylation catalyst selected from the group consisting of alumina, silica, silica-alumina, and silica-magnesia under substantially anhydrous conditions at a temperature in the range of from 200° C to about 325° C.
Claim 2
Dependent Claim
54 words
A process for preparing tetrahydrofuran which comprises heating a carboxylic acid monoester of 1,4-butanediol in the vapor phase in the presence of a dehydroacyloxylation catalyst selected from the group consisting of alumina, silica, silica-alumina, and silica-magnesia under substantially anhydrous conditions at a temperature in the range of from 200° C to about 325° C.
Claim 3
Dependent Claim
15 words
The process of claim 1 in which the carboxylic acid monoester of 1,4-butanediol is 4-acetoxybutanol.
References Cited (Backward Citations)
GB1170222A
Cited
DE2062950A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-07 | 1980-09-06 | 1981-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-07 | 1984-09-06 | 1985-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-07 | 1988-09-06 | 1989-03-08 | $7700.00 | Window Closed / Lapsed |