REMOVAL OF PERMANGANATE REDUCING COMPOUNDS FROM METHANOL CARBONYLATION PROCESS STREAM

摘要

An improvement of the methanol carbonylation process for manufacturing acetic
acid is disclosed. Specifically disclosed is a method for reducing the
formation of alkyl iodides and C3-8 carboxylic acids by removing permanganate
reducing compounds ("PRC''s") from the light phase of the condensed light ends
overhead stream, including (a) distilling the light phase to yield a PRC
enriched overhead stream; and (b) extracting the third overhead stream with
water in at least two consecutive stages and separating therefrom one or more
aqueous streams containing PRC''s.