Patent ID: 9056825
Filing Date: 2015-06-16
Classification: B01D,C07C

Abstract:
1. A process for removing permanganate reducing compounds (PRC's) from a crude acetic acid composition, the process comprising the steps of: separating the crude acetic acid composition in a light ends column into an overhead vapor stream comprising halogen promoter, water, acetic acid, methyl acetate, methanol, dimethyl ether, and at least one PRC, and an acetic acid product stream; condensing and biphasically separating the overhead vapor stream into a heavy phase and a light phase; extracting the light phase to obtain an aqueous stream comprising methyl acetate and at least one PRC, and a raffinate comprising halogen promoter, and methyl acetate; and separating the aqueous stream in a distillation column into an overhead PRC stream and a bottoms stream, wherein the overhead PRC stream is enriched with PRC with respect to the bottoms stream.