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AssigneePremelec Electrode Ltd.
InventorsMasaharu Uno, Shuhei Wakita, Masao Sekimoto, Tsuneto Furuta, Yoshinori Nishiki
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An electrolytic cell and method of electrolysis for producing hydrogen peroxide at a moderate current density while preventing metal deposition on the cathode surface. A feed water from which multivalent metal ions have been removed and in which a salt of a univalent metal, e.g., sodium sulfate, has been dissolved in a given concentration is prepared with an apparatus for removing multivalent metal ions and dissolving a salt in low concentration. The feed water is supplied to an electrolytic cell. Even when electrolysis is continued, almost no deposition of a hydroxide or carbonate occurs on the cathode because multivalent metal ions are not present in the electrolytic solution. Due to the dissolved salt, a sufficient current density is secured to prevent an excessive load from being imposed on the electrodes, etc. Thus, stable production of hydrogen peroxide is possible over a long period of time.
An electrolytic cell for hydrogen peroxide production, which comprises an electrolytic cell having an anode and a cathode therein, means for supplying to the electrolytic cell an oxygen-containing gas and a feed water containing at least one salt selected from the group consisting of chlorides, sulfates, nitrates and acetates of a univalent metal dissolved therein in a concentration of from 0.001 to 0.1 M, and means for conducting electrolysis while supplying said oxygen-containing gas and feed water to thereby produce hydrogen peroxide, said electrolytic cell comprising a diaphragm partitioning the electrolytic cell into an anode chamber including the anode and a cathode chamber including an oxygen gas diffusion cathode, said oxygen gas diffusion cathode partitioning said cathode chamber into a gas chamber and a solution chamber positioned between the gas chamber and the diaphragm, said electrolytic cell comprising means for supplying an oxygen-containing gas to said oxygen gas diffusion cathode and feed water to said solution chamber, and an outlet for recovering hydrogen peroxide solution from said solution chamber.
A process for producing hydrogen peroxide, which comprises:
Dependencies are inferred from the claim text.