A novel electrochemical reactor having a vertical stack of perforated graphite plates as bipolar electrodes was investigated by using the electrolysis of sodium bromide. The ratio of Faradaic current to reactor current was explained by an equivalent circuit model which consisted of bypass, sandwiched solution and Faradaic resistances.
Energy consumption for bromine production was influenced by liquid flow regime such as continuous flow or trickle flow and by introducing inert gas countercurrently. Effects of flow regimes of liquid and gas on energy consumption were clarified by the changes of Faradaic current efficiency and the ratio of Faradaic current to total reactor current with the electrode potential difference between the two sides of a bipolar plate.