Process for the preparation of a carboxylic acid from its...

Details Process for the preparation of a carboxylic acid from its... Process for the preparation of a carboxylic acid from its...

C - Chemistry, Metallurgy

07

C

260/529.5

C07C 53/08 (2006.01) C07C 51/12 (2006.01) C07C 51/353 (2006.01)

Patent

CA 1221107

ABSTRACT OF THE DISCLOSURE A carboxylic acid of formula RCO2H where R is a C1 to C10 aliphatic hydrocarbyl group is prepared by heating under substantially anhydrous conditions an ester of formic acid of formula HC02R where R is as defined above in the presence of carbon monoxide and an effective amount of a catalyst system comprising a Group VIII metal, a halide and a compound containing a quaternary Group V atom. The quaternary Group V atom can be formed in situ by adding a compound containing a trivalent nitrogen, phosphorus or arsenic atom quaternisable under the reaction conditions and a quaternizing agent. Acetic acid is prepared by heating methyl formate in the presence of a catalyst system containing a rhodium compound, an iodide and a quaternary nitrogen-containing heterocyclic base.

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