公开(公告)号：US20230133006A1

公开(公告)日：2023-05-04

申请号：US17915728

申请日：2021-03-29

Applicant: DAICEL CORPORATION

Inventor： Kazuhito TAKEDA ,  Naoyuki FUKUI ,  Miduki DEBA

IPC: C07C51/44 ,  C07C51/42 ,  B01D3/14 ,  B01D71/02 ,  C02F1/44 ,  C02F1/04

Abstract: Provided is a method for producing purified acetic acid from a mixed solution containing acetic acid, an organic solvent, and water in an energy-efficient manner. The method, which is for producing purified acetic acid from a mixed solution containing acetic acid, an organic solvent, and water, includes: a distillation step in which the mixed solution is distilled and separated into a purified liquid rich in acetic acid and a separated liquid rich in an organic solvent; and a membrane separation step in which the water is separated from the purified liquid by a separation membrane. The purified liquid has a water concentration of 4 wt.% or less.