Title:
ACETIC-ACID COLLECTION METHOD
Document Type and Number:
WIPO Patent Application WO/2022/054784
Kind Code:
A1
Abstract:
Provided is an acetic-acid collection method that has an excellent vapor saving effect or a production efficiency improving effect. The acetic-acid collection method includes: a step (1) in which an aqueous acetic acid solution in which cellulose acetate has been dissolved is separated by a reverse osmosis membrane treatment into a membrane-permeated liquid (A) that includes acetic acid and water and a membrane-concentrated liquid (B) that includes acetic acid, water, and cellulose acetate; a step (2-A) in which the membrane-permeated liquid (A) is brought into contact with an organic solvent and is separated into an extracted liquid phase that primarily includes the acetic acid and the organic solvent and an extraction residue phase that primarily includes the water; a step (3-A) in which the extracted liquid phase is loaded into a distillation tower; a step (2-1-B) in which the membrane-concentrated liquid (B) is brought into contact with an organic solvent and is separated into an extracted liquid phase that primarily includes the acetic acid, the organic solvent and the cellulose acetate and an extraction residue phase that primarily includes the water and the cellulose acetate; a step (2-2-B) in which the extracted liquid phase is vaporized and separated into a vapor that includes the acetic acid and the organic solvent and a vaporization residue liquid that includes the cellulose acetate; a step (3-B) in which the vapor is loaded into a distillation tower; and a step (4) in which the acetic acid is collected from the distillation tower as a bottom product liquid.
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Inventors:
MATSUYAMA HIDETO (JP)
FUKUI NAOYUKI (JP)
MATSUI SHIGENORI (JP)
HAYAMIZU HIDETAKA (JP)
MIYOSHI KAZUTAKA (JP)
KOUNO MITSUHIRO (JP)
FUKUI NAOYUKI (JP)
MATSUI SHIGENORI (JP)
HAYAMIZU HIDETAKA (JP)
MIYOSHI KAZUTAKA (JP)
KOUNO MITSUHIRO (JP)
Application Number:
PCT/JP2021/032798
Publication Date:
March 17, 2022
Filing Date:
September 07, 2021
Export Citation:
Assignee:
UNIV KOBE NAT UNIV CORP (JP)
DAICEL CORP (JP)
DAICEL CORP (JP)
International Classes:
B01D61/02; C07C51/44; C07C53/08; C08B3/06
Foreign References:
| JP2016534167A | 2016-11-04 | |||
| JP2017159220A | 2017-09-14 | |||
| JP2014520080A | 2014-08-21 | |||
| JPS5610131A | 1981-02-02 | |||
| JPS61123601A | 1986-06-11 |
Attorney, Agent or Firm:
GOTO & CO. (JP)
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