Title:
METHOD FOR PRODUCING LITHIUM HYDROXIDE AQUEOUS SOLUTION
Document Type and Number:
WIPO Patent Application WO/2024/043228
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing a method for producing a lithium hydroxide aqueous solution, the method comprising a membrane electrolysis step in which a lithium salt aqueous solution is electrically decomposed with high efficiency. This method for producing a lithium hydroxide aqueous solution comprises a membrane electrolysis step in which a lithium salt aqueous solution is electrically decomposed by using a composite membrane provided with: a membrane configured from a resin in which a sulfonate group is bonded as an ion-exchange group; and a layer configured from a resin in which a carboxylic acid group is bonded. The composite membrane preferably has a polymerization unit represented by -(CF2-CF2)- and a polymerization unit represented by -(CF2-CF(-O-(CF2CF(CF3)O)-(CF2)2-CO2Li)).
Inventors:
SAKUMA YUKIO (JP)
SAKAI HIROTAKA (JP)
SAKAI HIROTAKA (JP)
Application Number:
PCT/JP2023/030115
Publication Date:
February 29, 2024
Filing Date:
August 22, 2023
Export Citation:
Assignee:
ASAKA RIKEN CO LTD (JP)
International Classes:
C25B1/46; C01D15/02; C22B3/06; C22B3/20; C22B26/12
Domestic Patent References:
| WO2016132491A1 | 2016-08-25 | |||
| WO2014203886A1 | 2014-12-24 | |||
| WO2015064644A1 | 2015-05-07 | |||
| WO2021149281A1 | 2021-07-29 | |||
| WO2021190402A1 | 2021-09-30 | |||
| WO2021166479A1 | 2021-08-26 |
Foreign References:
| JPH04350190A | 1992-12-04 | |||
| JP2015531826A | 2015-11-05 | |||
| JPS63310988A | 1988-12-19 | |||
| JP2009269810A | 2009-11-19 | |||
| JP2017075398A | 2017-04-20 |
Other References:
WAKAMATU HISASHI, KATAYOSE MITSURU, SHIROKI HIROYUKI: "Development of Perfluorinated Ion-exchange Membrane and Chlor-Alkali Electrolysis", JOURNAL OF THE JAPAN SEA HYDROLOGY SOCIETY, vol. 47, no. 4, 1 January 1993 (1993-01-01), pages 259 - 264, XP093142398
Attorney, Agent or Firm:
DELOITTE TOHMATSU IP FIRM (JP)
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