The process of carbonilacao methyl acetate in liquid phase

摘要

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+I- in which A+ is a nitrogen group quaternary onium cation, or an alkali metal cation, and, (d) if appropriate, a carboxylate of the formula A'n+(OCOR)n-, in which n is 1 or 2 and A'n+ is defined as was A+, or is an alkaline earth metal cation, with A'n+ and A+ 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 XT) being such that the atomic ratio XT/(A++n.A'n+) is less than or equal to 1.