Abstract: The present invention provides a process for the continuous production of chlorine dioxide by the reaction of hydrochloric acid with an alkali metal chlorate solution, which is obtained by means of an electrolysis plant from a chlorate solution containing alkali metal chloride circulating in the process, together with cathodically-formed hydrogen, in a cascade reactor with the introduction of air, wherein the reaction of the alkali metal chlorate solution with the hydrochloric acid is carried out under reduced pressure and chlorine gas separated off from the reaction product is reacted with the cathodically-formed hydrogen with the introduction of external chlorine gas to give the required amount of hydrochloric acid.

Abstract: An electrolysis cell having a housing with an inlet and an outlet for a through-flowing electrolyte and at least three monopolar electrodes, each comprising plates fastened on a common carrier in parallel array. The plates of one polarity extend into the gaps formed between the plates of the other polarity and at least one electrode to on polarity is disposed between two electrodes of the other polarity.

Abstract: Sodium chloride in aqueous solution is converted to hypochlorite and chlorate by electrolysis in groups of cells whose electrodes are connected to a DC source in series circuit while the electrolyte is pumped through the cells in parallel flow between a distribution manifold and a collecting manifold connected to the cells by glass pipes. The manifold system consists of flangedly connected titanium pipes protected against electrolytic corrosion by electrical insulation between the sections and a small protective electrode having a platinum alloy surface and conductively connected to the anode pipe end adjacent the insulation.