Title:
METHOD FOR COLLECTING CARBOXYLIC ACID
Document Type and Number:
WIPO Patent Application WO/2022/239847
Kind Code:
A1
Abstract:
This method for collecting a carboxylic acid is a method for obtaining an inorganic carboxylic acid by separating a carboxylic acid from an aqueous solution containing water and the carboxylic acid, and comprises: a) a first step for bringing the aqueous solution into liquid-liquid contact with a prepared extracting agent that contains a carboxylic acid-extracting component and a diluent; b) a second step for distilling the prepared extracting agent obtained in the first step, azeotropically distilling the diluent component in the prepared extracting agent and water, separating the resultant into an extracting agent component layer composed mainly of a diluent and an aqueous layer, then discharging the aqueous layer, returning the extracting agent component layer composed mainly of a diluent to the distillation step through reflux, and discharging a carboxylic acid-containing prepared extracting agent from the bottom; and c) a third step for re-distilling the carboxylic acid-containing prepared extracting agent discharged in the second step, and returning, to the first step, a prepared extracting agent from which a carboxylic acid and water are removed and which is discharged from the bottom, wherein the diluent in the prepared extracting agent has the lowest azeotrope with water.
Inventors:
FUJITA TOMOYA (JP)
IWAFUNE MITSUHIRO (JP)
SUZUKI TAKAO (JP)
TAKEYAMA TOMOKIYO (JP)
ISHIZAWA HIDEKI (JP)
ODA AKIYOSHI (JP)
TAKAHASHI HIROAKI (JP)
OHNO JUNYA (JP)
NAKASHIMA KOUJI (JP)
NOUMI TADASHI (JP)
ISHII HIDETO (JP)
IWAFUNE MITSUHIRO (JP)
SUZUKI TAKAO (JP)
TAKEYAMA TOMOKIYO (JP)
ISHIZAWA HIDEKI (JP)
ODA AKIYOSHI (JP)
TAKAHASHI HIROAKI (JP)
OHNO JUNYA (JP)
NAKASHIMA KOUJI (JP)
NOUMI TADASHI (JP)
ISHII HIDETO (JP)
Application Number:
PCT/JP2022/020120
Publication Date:
November 17, 2022
Filing Date:
May 12, 2022
Export Citation:
Assignee:
REFINE HOLDINGS CO LTD (JP)
International Classes:
C07C51/44; C07C51/48; C07C53/02
Domestic Patent References:
| WO2020108066A1 | 2020-06-04 |
Foreign References:
| JP2003520832A | 2003-07-08 | |||
| JP2003524640A | 2003-08-19 | |||
| JPS5724324A | 1982-02-08 | |||
| JPH11228486A | 1999-08-24 | |||
| JPH09151158A | 1997-06-10 | |||
| JPH09151158A | 1997-06-10 | |||
| JP2018062512A | 2018-04-19 | |||
| JPS61176550A | 1986-08-08 | |||
| JPS61176551A | 1986-08-08 | |||
| JPH08283191A | 1996-10-29 | |||
| JPS61176552A | 1986-08-08 | |||
| JPS61176553A | 1986-08-08 | |||
| JPS55154935A | 1980-12-02 | |||
| JPS6143133A | 1986-03-01 | |||
| DE2545658A1 | 1977-04-21 |
Attorney, Agent or Firm:
HASEGAWA Yoshiki et al. (JP)
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