Akzo Nobel N.v.

Rwo Gmbh

Fredrik Herlitz

Takayuki Shimamune

Bo Håkansson

Eduardo Fontes

Viktoria Lindstrand

Lars Nyman

Jonas Echardt

Helga Hakansson

Bo Hakansson

The invention relates to a process for producing alkali metal chlorate in an electrolytic cell that is divided by a cation selective separator into an anode compartment in which an anode is arranged and a cathode compartment in which a gas diffusion electrode is arranged. The process comprises introducing an electrolyte solution containing alkali metal chloride into the anode compartment and an oxygen-containing gas into the cathode compartment. The invention also relates to an electrolytic cell for the production of alkali metal chlorate comprising a cation selective separator dividing the cell into an anode compartment in which an anode is arranged and a cathode compartment in which a gas diffusion electrode is arranged. An inlet for electrolyte solution and an outlet for electrolysed solution are provided in the anode compartment and an inlet for introducing oxygen-containing gas is provided in the gas chamber. The invention also relates to a plant comprising the electrolytic cell and the use thereof for the production of alkali metal chlorate and/or chlorine dioxide.

Process for producing alkali metal chlorate

The present invention relates to a process of treating contaminated water containing microorganisms comprising feeding a contaminated water stream at a volumetric flow of about 1 to about 1000 m/h through an electrolyser zone, said water stream having a conductivity from about 0.0001 to about 100 S/m, electrolysing said water stream in said electrolyser zone defined by at least one electrode pair enabling treatment of microorganisms, said at least one electrode pair comprising an anode and a cathode without separator means, said water stream being guided substantially perpendicularly through said at least one anode and cathode while imposing a voltage across said anode and cathode and supplying a direct current to said anode and cathode, withdrawing from the electrolyser zone a treated water stream. The invention also relates to an electrolytic cell in which said process can be performed, and to the use of the electrolytic cell.

Electrolytic cell

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Sundsvall, Sweden

Fredrik Herlitz