Process for the separation of iodine and its compounds from carbonylation products obtained by the carbonylation of dimethyl ether, methyl acetate or methanol

摘要

1. Process for separating iodine and its compounds 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 catalysts containing iodine, wherein in order to reduce the quantity of total iodine contaminating the carbonylation products to less than 20 ppb, the carbonylation products are treated at 20-200 degrees C with peracetic acid, diacetyl peroxide or compounds yielding them under the reaction conditions, and separated distillatively.