Carbonylation of methyl acetate
US4511517A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 16, 1982 |
| Grant date | Apr 16, 1985 |
| Priority date | — |
| Expiry date | Jul 16, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/56
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Methyl acetate is carbonylated, advantageously to acetic anhydride, in a homogeneous liquid phase, advantageously in a virtually anhydrous reaction medium, in the presence of (a) a cobalt source, (b) a source of iron in the zero oxidation state, (c) an ionic iodide of the formula A.sup.+ I.sup.- in which A.sup.+ is a nitrogen group quaternary onium cation, or an alkali metal cation, and, (d) if appropriate, a carboxylate of the formula A'.sup.n+ (OCOR).sub.n.sup.-, in which n is 1 or 2 and A'.sup.n+ is defined as was A.sup.+, or is an alkaline earth metal cation, with A'.sup.n+ and A.sup.+ either being the same or different, and R is an alkyl, aralkyl or aryl radical having a maximum of 8 carbon atoms, with the total amount of halogen compounds present in the carbonylation reaction medium (expressed in gram atoms of halogen and designated by X.sub.T) being such that the atomic ratio X.sub.T /(A.sup.+ +n.A'.sup.n+) is less than or equal to 1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.