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

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 in the presence of an iodine-containing catalyst. The quantity of total iodine contaminating the carbonylation products is reduced to less than 20 ppb iodine by treating the products at 20 - 200 °C with peracetic acid diacetyl per-, oxide or a compound yielding these two agents under the reaction conditions, and separating them distillatively.