Carbonylation of methyl acetate
US4500474A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 11, 1982 |
| Grant date | Feb 19, 1985 |
| Priority date | — |
| Expiry date | Jun 11, 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, in a virtually anhydrous reaction medium, in the presence of: (a) a cobalt source, (b) a ruthenium source, (c) an ionic iodide of the formula: A.sup.m+ I.sub.m.sup.- in which A.sup.m+ is a nitrogen group quaternary onium cation, an alkali metal or alkaline earth metal cation, or a lanthanide or actinide group metal cation, (c') 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.m+, with A'.sup.n+ and A.sup.m+ either being the same or different, and R is an alkyl, aralkyl or aryl radical having a maximum of 8 carbon atoms, and (d) hydrogen, 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 /(m.A.sup.m+ +n.A'.sup.n+) is less than or equal to 1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.