Process for the hydrogenation of maleic acid to 1,4-butanediol
US5473086A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 17, 1995 |
| Grant date | Dec 5, 1995 |
| Priority date | — |
| Expiry date | Jan 17, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C29/177
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Maleic acid, maleic anhydride or other hydrogenatable precursor are catalytically hydrogenated to 1,4-butanediol and tetrahydrofuran. It has been discovered that high yields of 1,4-butanediol are achieved when the hydrogenation catalyst comprises palladium, silver and rhenium on a carbon support and is prepared by the steps of (i) impregnating a carbon support with a source of palladium, silver and rhenium, wherein the source of palladium, silver and rhenium is at least one solution, (ii) after each impregnation step, drying the impregnated carbon support to remove solvent, (iii) heating the impregnated carbon support at a temperature of about 120.degree. C. to about 350.degree. C. under reducing conditions. The palladium in the catalyst is present in the form of crystallites having a particle size of less than 10 nm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.