PROCESS FOR THE PURIFICATION OF CARBOXYLIC ACIDS AND/OR THEIR ANHYDRIDES

摘要

7718(2) PROCESS FOR THE PURIFICATION OF CARBOXYLIC ACIDS AND/OR THEIR ANHYDRIDES A process for purifying an iodide-contaminated carboxylic acid and/or anhydride fraction obtained by liquid phase carbonylation using a carbonylation catalyst, an iodine-containing promoter and optional iodine-containing copromoter comprises vapourising the fraction after it has been freed of catalyst, feedstock and promoter components to produce a vapour acid and/or anhydride fraction having reduced iodide contamination.