公开(公告)号：WO2022073853A1

公开(公告)日：2022-04-14

申请号：PCT/EP2021/077012

申请日：2021-09-30

Applicant: INEOS ACETYLS UK LIMITED

Inventor： BRACE, James William

IPC: B01D3/32 ,  B01D3/14

Abstract: The present disclosure relates generally to processes and systems for distillation of acetic acid products. In one aspect, the disclosure provides a process for separating a feed stream comprising acetic acid and propionic acid in a distillation column. The process includes introducing a feed stream into the column through a feed inlet; withdrawing a first product stream comprising acetic acid and propionic acid from a first draw outlet disposed at a level above the level of the feed inlet; and withdrawing a second product stream comprising acetic acid and propionic acid from a second draw outlet disposed at a level between the level of the feed inlet and the level of the first draw outlet. The volume ratio of the first product stream to the second product stream is in the range of 1:9 to 19:1; and the amount of propionic acid present in the second product stream is at least 50 ppmw greater than the amount of propionic acid present in the first product stream.

公开(公告)号：WO2022073855A1

公开(公告)日：2022-04-14

申请号：PCT/EP2021/077018

申请日：2021-09-30

Applicant: INEOS ACETYLS UK LIMITED

Inventor： BRACE, James William

IPC: B01D3/42

Abstract: The present disclosure relates generally to processes and apparatuses for separating an effluent in an acetic acid production unit. Accordingly, one aspect of the disclosure provides a process including introducing a feed stream comprising acetic acid and water into a distillation column through a feed inlet, separating the feed stream to form a water- rich first fraction and an acetic acid-rich second fraction, measuring an internal temperature and an internal pressure of the column at positions between a first outlet and a second outlet of the column, determining a corrected temperature of the column based on the measured internal pressure and internal temperature of the column, adjusting a heating rate of a heat source in thermal communication with a bottom section of the column if the corrected temperature differs from a target value, and then withdrawing at least a portion of the separated acetic acid-rich second fraction, the fraction comprising 500-1,500 ppm water by weight (ppmw).