Electrochemical reaction device

A method of using an electrochemical reactor, comprising:

• preparing an electrochemical reactor, the electrochemical reactor having
• a tank including a first room and a second room,
• a first electrode disposed in the first room and configured to reduce a first substance,
• a second electrode disposed in the second room and configured to oxidize a second substance,
• a first pipe connected to the first room, and
• a second pipe connected to the first room and disposed above the first pipe;
• supplying a first liquid into the first room and the first pipe and a second liquid into the first room and the second pipe to form a first electrolytic solution, and supplying a second electrolytic solution into the second room, the first liquid containing water and forming a first liquid phase in the first electrolytic solution, the second liquid containing an organic solvent and forming a second liquid phase in the first electrolytic solution, the second electrolytic solution containing the second substance, and at least one liquid selected from the group consisting of the first and second liquids further containing the first substance;
• applying a voltage between the first and second electrodes to reduce the first substance and thus form a reduction product and to oxidize the second substance and thus form a oxidization product;
• and
• recovering the reduction product with the second liquid through the second pipe, and recovering the oxidization product.