US4048196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of butanediol and/or tetrahydrofuran from maleic and/or succinic anhydride via γ- butyrolactone
Assignee: BASF SE
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Filing: 1975-11-14
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Granted: 1977-09-13
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Expires: 1995-11-14
Abstract
Abstract A process for the manufacture of 1,4-butanediol and/or tetrahydrofuran, wherein maleic acid or succinic acid is used as the starting material, butyrolactone is produced in defined stages and is hydrogenated to butanediol or tetrahydrofuran, and the by-products formed are in each case recycled to the process.
Inventors
- 👤 Franz Josef Broecker
- 👤 Matthias Schwarzmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:34
CPC Classifications
C; C07; C07D; C07D315/00; B; B01; B01J; B01J23/00; B01J23/70; B01J23/72; C07C; C07C29/00; C07C29/132; C07C29/136; C07C29/147; C07C29/149; C07C55/00; C07C55/02; C07C55/10; C07D307/00; C07D307/02; C07D307/04; C07D307/06; C07D307/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
98 words
A process for the manufacture of 1,4-butanediol and/or tetrahydrofuran by catalytic hydrogenation of maleic anhydride and/or succinic anhydride (in the former case via succinic anhydride), with formation of γ-butyrolactone as an intermediate, wherein the improvement consists in a. hydrogenating maleic anhydride or succinic anhydride in the presence of γ-butyrolactone over a catalyst containing nickel, to give γ-butyrolactone, b. removing the water formed during the hydrogenation by separating γ-butyrolactone and water from succinic anhydride by distillation, recycling succinic anhydride and separating γ-butyrolactone and water by distillation, and c. converting γ-butyrolactone into butanediol and/or tetrahydrofuran over a catalyst containing copper.
Claim 2
Dependent Claim
98 words
A process for the manufacture of 1,4-butanediol and/or tetrahydrofuran by catalytic hydrogenation of maleic anhydride and/or succinic anhydride (in the former case via succinic anhydride), with formation of γ-butyrolactone as an intermediate, wherein the improvement consists in a. hydrogenating maleic anhydride or succinic anhydride in the presence of γ-butyrolactone over a catalyst containing nickel, to give γ-butyrolactone, b. removing the water formed during the hydrogenation by separating γ-butyrolactone and water from succinic anhydride by distillation, recycling succinic anhydride and separating γ-butyrolactone and water by distillation, and c. converting γ-butyrolactone into butanediol and/or tetrahydrofuran over a catalyst containing copper.
Claim 3
Dependent Claim
48 words
A process as claimed in claim 1, wherein the hydrogenation of maleic anhydride via succinic anhydride to γ-butyrolactone is carried out by converting maleic anhydride to succinic anhydride at relatively low pressure and low temperature and converting succinic anhydride to γ-butyrolactone at relatively high pressure and high temperature.
Claim 4
Dependent Claim
29 words
A process as claimed in claim 1, wherein the copper catalyst used is a hydrogenation catalyst containing copper and zinc hydroxide or zinc oxide, and 1,4-butanediol is obtained preferentially.
Claim 5
Dependent Claim
19 words
A process as claimed in claim 1, wherein the copper catalyst used contains aluminum and tetrahydrofuran is obtained preferentially.
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) | 1980-09-12 | 1981-03-14 | 1981-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-12 | 1985-03-14 | 1985-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-12 | 1989-03-14 | 1989-09-13 | $7700.00 | Window Closed / Lapsed |