Patent ID: 9302975
Filing Date: 2016-04-05
CPC Classification: B01D,B01J,C07C

Claim Text:
1. A process for producing acetic acid, comprising: separating a reaction medium in a flash vessel into a liquid recycle stream and a vapor product stream comprising from 45 to 75 wt. % acetic acid, from 24 to less than 36 wt. % methyl iodide, up to 9 wt. % methyl acetate, up to 15 wt. % water, from 0.005 to 1 wt. % acetaldehyde, and up to 1 wt. % hydrogen iodide; and distilling at least a portion of the vapor product stream in a first column to obtain an acetic acid product stream comprising acetic acid and up to 300 wppm hydrogen iodide and an overhead stream comprising methyl iodide, water and methyl acetate.