US 12,435,436 B2
Electrolysis arrangement for alkaline electrolysis and method therefor
Nga Thi Quynh Do, Frankfurt am Main (DE); Tibor Svitnic, Samorin (SK); Gary Combes, Frankfurt am Main (DE); and Marie Khuny Khy, Champigny-sur-Marne (FR)
Assigned to L'Air Liquide, Societe Anonyme Pour l'Etude et l'Exploitation des Procedes Georges Claude, Paris (FR)
Filed by L'Air Liquide, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude, Paris (FR)
Filed on Apr. 8, 2022, as Appl. No. 17/716,556.
Claims priority of application No. 21020192 (EP), filed on Apr. 9, 2021.
Prior Publication US 2022/0333260 A1, Oct. 20, 2022
Int. Cl. C25B 15/08 (2006.01); C25B 1/04 (2021.01); C25B 9/21 (2021.01); C25B 9/77 (2021.01); C25B 15/02 (2021.01)
CPC C25B 15/087 (2021.01) [C25B 1/04 (2013.01); C25B 9/21 (2021.01); C25B 9/77 (2021.01); C25B 15/02 (2013.01); C25B 15/083 (2021.01)] 14 Claims
OG exemplary drawing
 
1. An electrolysis arrangement comprising;
an electrolysis stack for the electrochemical production of hydrogen and oxygen from an alkaline electrolysis medium, wherein the electrolysis stack comprises an anode chamber and a cathode chamber;
an anode separator for the separation of oxygen from the electrolysis medium,
a cathode separator for the separation of hydrogen from the electrolysis medium,
a first pipe system to circulate the electrolysis medium between the anode chamber of the electrolysis stack and the anode separator;
a second pipe system to circulate the electrolysis medium between the cathode chamber of the electrolysis stack and the cathode separator;
a third pipe system interconnecting the first pipe system and the second pipe system and comprising a mixing device, wherein
the first pipe system, the second pipe system and the third pipe system are configured so that a first fraction of an electrolysis medium withdrawn from the anode separator and a second fraction of an electrolysis medium withdrawn from the cathode separator is mixed by the mixing device, thereby resulting in a fraction of a mixed electrolysis medium which is fed to the electrolysis stack, wherein
the electrolysis arrangement is further configured so that an amount of the fraction of the mixed electrolysis medium is decreased when a current density of a direct current supplied to the electrolysis stack is decreased, and
an amount of the fraction of the mixed electrolysis medium is increased when a current density of a direct current supplied to the electrolysis stack is increased.