| abstract |
(57) [Summary] (Modified) Composition: A mixture of methyl ester, alcohol and water, preferably as an aqueous acetic acid solution, with carbon monoxide and hydrogen, under selective partial pressure, preferably nickel or nickel / molybdenum compounds. In the presence of a catalyst composed of, a reaction is carried out at a predetermined temperature with a promoter composed of a phosphorus compound and an iodine compound as ligands. [Effect] Nickel or nickel / molybdenum catalyst Dissolves during the fractionation stage at high operating temperatures and low carbon monoxide partial pressure. Therefore, in this way, the separation step High yields of the desired crude acetic acid product are obtained without excessive consumption of steam and cooling water. Unreacted alcohol, ester and water can be recycled and reused as reactants after separation by fractional distillation. |