Electrolytic device

Patent metadata

Field	Value
Publication number	US-2024271296-A1
Application number	US-202218568424-A
Country	US
Kind code	A1
Filing date	Jun 28, 2022
Priority date	Jun 30, 2021
Publication date	Aug 15, 2024
Grant date	—

Abstract

An electrolytic device includes: an electrolytic tank; an ion exchange membrane configured to partition the electrolytic tank into a cathode chamber and an anode chamber; a catholyte supply unit configured to supply an electrolytic solution serving as a catholyte to the cathode chamber; a catholyte discharge unit configured to discharge the catholyte from the cathode chamber; an anolyte supply unit configured to supply an electrolytic solution serving as an anolyte to the anode chamber; an anolyte discharge unit configured to discharge the anolyte from the anode chamber; a cathode; an anode; a cathode side power feeder provided in the cathode chamber and configured to supply electric power to the cathode; and an anode side power feeder provided in the anode chamber and configured to supply electric power to the anode. A pH of the catholyte is lower than a pH of the anolyte.

First claim

1 . An electrolytic device comprising:
an electrolytic tank; an ion exchange membrane configured to partition the electrolytic tank into a cathode chamber and an anode chamber; a catholyte supply unit configured to supply an electrolytic solution serving as a catholyte to the cathode chamber; a catholyte discharge unit configured to discharge the catholyte from the cathode chamber; an anolyte supply unit configured to supply an electrolytic solution serving as an anolyte to the anode chamber; an anolyte discharge unit configured to discharge the anolyte from the anode chamber; a cathode provided on a surface of the ion exchange membrane on the cathode chamber side; an anode provided on a surface of the ion exchange membrane on the anode chamber side; a cathode side power feeder provided in the cathode chamber and configured to supply electric power to the cathode; and an anode side power feeder provided in the anode chamber and configured to supply electric power to the anode, wherein a pH of the catholyte is lower than a pH of the anolyte.

2 . The electrolytic device according to claim 1 , wherein
the catholyte is an aqueous solution containing a substance A, and the anolyte is an aqueous solution containing the substance A and a substance B, provided that the substance A is at least one substance selected from the group including ultrapure water, pure water, ion-exchanged water, distilled water, industrial water, and filtered water, and that the substance B is at least one substance selected from the group including alkali metal hydroxides (LiOH, NaOH, KOH, RbOH, and CsOH), tetraalkylammonium hydroxides (N(CH 3 ) 4 OH and N(C 2 H 5 ) 4 OH), carbonates (KHCO 3 and K 2 CO 3 ), and alkaline earth metal hydroxides (Ca(OH) 2 and Mg(OH) 2 ).

3 . The electrolytic device according to claim 2 , wherein
the catholyte is an aqueous solution containing the substance A and the substance B, and the anolyte is an aqueous solution containing the substance A and the substance B, and a concentration of the substance B contained in the catholyte is lower than a concentration of the substance B contained in the anolyte.

4 . The electrolytic device according to claim 2 , wherein
the anolyte is an aqueous solution containing the substance A and the substance B, and the catholyte is an aqueous solution containing a pH buffer having a pH buffering capacity.

5 . The electrolytic device according to claim 4 , wherein
the pH buffer comprises: from 1×10 −6 mol/L to 10 mol/L of at least one or more substances selected from KHCO e , K 2 CO 3 , phosphoric acid, boric acid, tris H 2 NC(CH 2 OH) 3 (tris(hydroxymethyl)aminomethane), HEPES [2-[4-(2-hydroxyethyl)-1-piperazinyl]ethane sulfonic acid, and citric acid.

6 . The electrolytic device according to claim 1 , wherein the ion exchange membrane is an anion exchange membrane having monovalent anion selectivity.

7 . The electrolytic device according to claim 1 , wherein
the ion exchange membrane is a bipolar membrane in which an anion exchange membrane having monovalent anion selectivity and a cation exchange membrane having monovalent cation selectivity are bonded to each other, and the anion exchange membrane is disposed on the cathode chamber side and the cation exchange membrane is disposed on the anode chamber side.

8 . The electrolytic device according to claim 1 , wherein
the ion exchange membrane is a bipolar membrane in which an anion exchange membrane having monovalent anion selectivity and a cation exchange membrane having monovalent cation selectivity are bonded to each other, and the anion exchange membrane is disposed on the anode chamber side and the cation exchange membrane is disposed on the cathode chamber side.

9 . The electrolytic device according to claim 7 , wherein
the anion exchange membrane is an anion exchange membrane having hydroxide ion conductivity, and the cation exchange membrane is a proton exchange membrane having proton conductivity.

Assignees

• Mitsubishi Heavy Ind Ltd

Inventors

• Tagami Naoto
• Tajima Hidehiko
• Furukawa Shoichi
• Mukai Daisuke
• Kako Hiroshi
• Sukenobu Takahiro

Classifications

• C25B15/08

  Supplying or removing reactants or electrolytes; Regeneration of electrolytes · CPC title

• C25B1/04

  by electrolysis of water · CPC title

• C25B9/65

  Means for supplying current; Electrode connections; Electric inter-cell connections · CPC title

• C25B15/087

  Recycling of electrolyte to electrochemical cell · CPC title

• C25B13/08

  based on organic materials · CPC title