反应详情

This example demonstrates the use of isobutyl acetate as an entrainer. The HAD column is designed to obtain the desired purity acetic acid product at the column bottom, while obtaining isobutyl acetate/water azeotrope as overheads. The overhead stream when condensed and decanted forms two liquid phases—organic and aqueous. The organic phase comprises mostly isobutyl acetate and the aqueous phase comprises mostly water (an acid free aqueous stream (AFAS)). The entire organic phase is refluxed back to the drying column to provide enough isobutyl acetate to act as an entrainer. It is then mixed with the feed stream and co-fed to the HAD column. The aqueous phase is drawn out from the system for further treatment or discharge. A portion of the aqueous phase may be refluxed back to the column if the organic reflux falls short of fulfilling the column specifications.