Patent ID: 7582792
Filing Date: 2009-09-01
Classification: C07C

Abstract:
1. Carbonylation process for the production of a carbonylation product selected from carboxylic acids, carboxylic acid esters, carboxylic acid anhydrides, and a mixture of any two or more thereof which comprises combining in a reaction zone a carbonylation feedstock compound selected from alkanols, dialkyl ethers, carboxylic acid esters, and a mixture of any two or more thereof: a Group VIII metal carbonylation catalyst comprising rhodium, iridium, or a compound thereof; an onium salt compound comprising a 1,3-dialkylimidazolium iodide or an N-alkylpyridinium iodide; and carbon monoxide under carbonylation conditions of pressure and temperature, wherein neither hydrogen iodide nor an alkyl iodide exogenous or extraneous to the carbonylation process is added or supplied to the reaction zone.