Abstract
Abstract The reaction of methyl iodide with carbon monoxide in the presence of cobalt (II) iodide as the catalyst has been investigated to know the effect of methyl iodide on the acetic acid synthesis from methanol and carbon monoxide catalyzed by the same catalyst. The reaction, CH3I+CO+H2O→CH3COOH+HI, does not take place before the methyl iodide used has been hydrolyzed completely into methanol and sodium iodide by adding enough amount of sodium acetate (CH3I+CH3COONa+H2O→CH3OH+NaI+CH3COOH). Methyl iodide also strongly inhibits the reaction of methanol with carbon monoxide catalyzed by cobalt (II) ion or dicobalt octacarbonyl, although iodide ion promotes the reaction effectively. The promotion effect of iodide ion has been discussed by considering the effect of an additive on carbonylation reactions in terms of a labilizing ligand and a non-labilizing ligand and a possible reaction scheme of methanol with carbon monoxide catalyzed by cobalt(II) iodide has been proposed.
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