Process for the production of gamma butyrolactone THF in predetermined amounts
US5149836A · kind A · utility
9Cited by
10References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 25, 1991 |
| Grant date | Sep 22, 1992 |
| Priority date | — |
| Expiry date | Jul 25, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D307/08
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
This invention provides a vapor phase process for the production of gamma-butyrolactone and tetrahydrofuran in a predetermined ratio by the steps of: hydrogenating a vapor mixture of maleic anhydride and excess hydrogen over a first bed of a Cu-Zn-Al catalyst, and directly contacting the crude reactor effluent therefrom with hydrogen over a second bed of Cu-Zn-Cr catalyst during a predetermined contact time and at a defined temperature, using selected amounts of catalyst in each bed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.