Two-stage maleic anhydride hydrogenation process for 1,4-butanediol synthesis
US5196602A · kind A · utility
10Cited by
3References
13Claims
0Family size
Assignee
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Key dates
| Filing date | Dec 30, 1991 |
| Grant date | Mar 23, 1993 |
| Priority date | — |
| Expiry date | Dec 30, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C29/149
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Maleic anhydride is hydrogenated to produce 1,4-butanediol in a two-stage process. In the first stage maleic anhydride and/or maleic acid contacted with hydrogen at a temperature of about 100.degree. C. to about 350.degree. C. in the presence of a suitable hydrogenation catalyst to produce succinic anhydride and/or gamma-butyrolactone. In the second stage, the succinic anhydride and/or gamma-butyrolactone and hydrogen are contacted at a temperature of about 180.degree. C. to about 350.degree. C. in the presence of a ruthenium-containing hydrogenation catalyst to produce 1,4-butanediol.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.