Electrochemical reaction device

An electrochemical reaction device, comprising:

• first reactors, each first reactor including
• a first tank having a first room and a second room,
• a first reduction electrode disposed in the first room, and
• a first oxidation electrode disposed in the second room;
• second reactors, each second reactor including
• a second tank having a third room and a fourth room,
• a second reduction electrode disposed in the third room, and
• a second oxidation electrode disposed in the fourth room;
• first pipes connecting the first tanks in series, one of the first pipes connecting the first room of one of the first tanks and the second room of another one of the first tanks;
• second pipes connecting the first tanks in series, one of the second pipes connecting the second room of the one of the first tanks and the first room of the other one of the first tanks;
• third pipes connecting the second tanks in series, one of the third pipes connecting the third room of one of the second tanks and the second room of another one of the second tanks;
• fourth pipes connecting the second tanks in series, one of the fourth pipes connecting the fourth room of the one of the second tanks and the third room of the other one of the second tanks;
• fifth pipes connecting the series-connected first tanks and the series-connected second tanks in parallel, one of the fifth pipes connecting the first room of the first one of the series-connected first tanks and the first room the first one of the series-connected second tanks, another one of the fifth pipes connecting the first room of the last one of the series-connected first tanks and the first room the last one of the series-connected first tanks;
• and
• sixth pipes connecting the series-connected first tanks and the series-connected second tanks in parallel, one of the sixth pipes connecting the second room of the first one of the series-connected first tanks and the second room the first one of the series-connected second tanks, another one of the sixth pipes connecting the second-room of the last one of the series-connected first tanks and the second room the last one of the series-connected second tanks.