US 12,227,860 B2
Method for purifying gas formed by electrolysis, and electrolytic apparatus
Akiyoshi Manabe, Kanagawa (JP)
Assigned to DE NORA PERMELEC LTD, Fujisawa (JP)
Appl. No. 17/439,290
Filed by DE NORA PERMELEC LTD, Fujisawa (JP)
PCT Filed Mar. 27, 2020, PCT No. PCT/JP2020/014034
§ 371(c)(1), (2) Date Sep. 14, 2021,
PCT Pub. No. WO2020/196835, PCT Pub. Date Oct. 1, 2020.
Claims priority of application No. 2019-060832 (JP), filed on Mar. 27, 2019.
Prior Publication US 2022/0154356 A1, May 19, 2022
Int. Cl. C25B 15/08 (2006.01); B01D 19/00 (2006.01); C25B 1/04 (2021.01); C25B 1/26 (2006.01); C25B 9/19 (2021.01)
CPC C25B 15/083 (2021.01) [B01D 19/0031 (2013.01); C25B 1/04 (2013.01); C25B 1/26 (2013.01); C25B 9/19 (2021.01); C25B 15/087 (2021.01)] 4 Claims
OG exemplary drawing
 
1. A purification method of electrolytic gas generated in an electrolysis cell having a cathode and an anode into which an electrolyte solution is supplied while circulating the electrolyzed electrolyte solution via a circulation tank disposed outside the electrolysis cell, comprising:
disposing a bag-shaped membrane pack in an interior of the circulation tank with a clearance left between the bag-shaped membrane pack and an inner wall of the circulation tank, wherein the bag-shaped membrane pack is made of a porous membrane material of a construction and is configured to cause first gas bubbles of the electrolytic gas generated from the anode, which coexist with the electrolyte solution and have a first diameter larger than a second diameter of second gas bubbles of the electrolytic gas generated from the cathode, to remain without permeation, and
wherein the bag-shaped membrane pack is of a shape having an opening at a top end thereof and closed at an entire side wall and entire bottom wall thereof and has a permeation area at an entire side wall and an entire bottom wall;
supplying the electrolyte solution coexisting with the first gas bubbles and the second gas bubbles of the electrolytic gas from the opening of the bag-shaped membrane pack into an interior of the bag-shaped membrane pack;
allowing the electrolyte solution, which has been supplied into the interior of the bag-shaped membrane pack, and the second gas bubbles, to permeate from the bag-shaped membrane pack into the circulation tank through the entire side wall and the entire bottom wall under a differential pressure caused by an own weight of the electrolyte solution, thereby causing the electrolytic gas and the first gas bubbles to remain in the interior of the bag-shaped membrane pack; and
repeating the electrolysis while continuously circulating the electrolyte solution coexisting with a fewer total gas bubbles of the first gas bubbles and the second gas bubbles from the circulation tank to the electrolysis cell than the total gas bubbles in a previous electrolysis, whereby the electrolytic gas generated from the electrolysis cell is purified.