Preparation of acetic anhydride
US4374070A · kind A · utility
29Cited by
3References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 21, 1980 |
| Grant date | Feb 15, 1983 |
| Priority date | — |
| Expiry date | Nov 21, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/56
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The preparation of acetic anhydride by the carbonylation of methyl acetate in the presence of rhodium, an iodine compound and lithium at elevated temperatures and pressures is improved by the inclusion of about 2 to 7 volume percent hydrogen in the gas fed to the carbonylation reactor. The presence of hydrogen suppresses tar formation and increases reaction rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.