Patent US4618634A successfully refreshed from Google Patents.
US4064145A
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US
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Production of tetrahydrofuran
Assignee: Celanese Corp
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Filing: 1976-10-27
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Granted: 1977-12-20
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Expires: 1996-10-27
Abstract
Abstract This invention provides a process for producing 4-hydroxybutanal in a yield of at least 87 percent by hydroformylation of allyl alcohol in a solvent at a temperature of about 20° C-120° C and a pressure of about 15-150 psi in the presence of a rhodium metal-phosphine complex hydroformylation catalyst. Also provided are additional processing procedures for recovering the 4-hydroxybutanal product and converting it into 1,4-butanediol and tetrahydrofuran.
Inventors
- 👤 Paul D. Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:10
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/02; C07D307/04; C07D307/06; C07D307/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
A process for producing tetrahydrofuran which comprises contacting hydrogen and carbon monoxide under hydroformylation conditions with allyl alcohol in a solvent at a temperature between about 20° C and 120° C and a pressure between about 15 and 150 psi in the presence of a hydroformylation catalyst comprising a complex of rhodium metal, carbon monoxide and triaryl phosphine ligand; recovering the 4-hydroxybutanal from the reaction mixture by aqueous extraction; and subjecting the resultant aqueous extract phase to hydrogenation under acidic conditions to convert 4-hydroxybutanal to tetrahydrofuran.
Claim 2
Dependent Claim
86 words
A process for producing tetrahydrofuran which comprises contacting hydrogen and carbon monoxide under hydroformylation conditions with allyl alcohol in a solvent at a temperature between about 20° C and 120° C and a pressure between about 15 and 150 psi in the presence of a hydroformylation catalyst comprising a complex of rhodium metal, carbon monoxide and triaryl phosphine ligand; recovering the 4-hydroxybutanal from the reaction mixture by aqueous extraction; and subjecting the resultant aqueous extract phase to hydrogenation under acidic conditions to convert 4-hydroxybutanal to tetrahydrofuran.
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) | 1980-12-19 | 1981-06-20 | 1981-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-19 | 1985-06-20 | 1985-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-19 | 1989-06-20 | 1989-12-20 | $7700.00 | Window Closed / Lapsed |