Process for separating iodine and its compounds from the products obtained on subjecting dimethylether, methyl acetate or methanol to a carbonylation reaction

Abstract From the Canadian patent

Iodine and its compounds are separated from the carbonylation products acetic acid, acetic anhydride or ethylidene diacetate obtained on subjecting dimethylether, methyl acetate or methanol to a carbonylation reaction; the total iodine contaminating the carbonylation products is reduced to less than 20 ppb iodine; to this end, the carbonylation products are treated at 50- 200°C with a hydrogen/carbon monoxide-mixture in the presence of at least on noble metal belonging to group VIII of the Periodic System of the elements as a catalyst, and separated from the catalyst.