Toshiba Corporation

Shibaura Mechatronics Corporation

Chlorine Engineers Corp., Ltd.

De Nora Permelec Ltd

Hiroki Domon

Masaaki Kato

Naoya Hayamizu

Nobuo Kobayashi

Masahiro Ohara

Yoshiaki Kurokawa

Makiko Tange

Yusuke Ogawa

Akiyoshi Manabe

Takamichi Kishi

To provide a method and an apparatus for producing a sodium hypochlorite solution on-site at a high efficiency and at the initial cost and suppressing operating cost without any problems about impurities derived from raw material water and raw salt. A method of producing a sodium hypochlorite solution on-site in the vicinity of a physical plant where a sodium hypochlorite solution is used. In production of a sodium hypochlorite solution by feeding secondary salt water, in an electrolyzer comparted into an anode chamber and a cathode chamber with an ion-exchange membrane, to the anode chamber and allowing components in the anode chamber and the cathode chamber after electrolysis to react in a reaction tank, there are included respective steps of treating raw material water A with a cation-exchange resin B to generate purified water, dissolving raw salt D in the purified water to generate primary salt water E, performing an examination for confirming the presence or absence of a precipitate or suspended solid in the primary salt water, and directly performing chelating in the case of no precipitate or suspended solid contained in the primary salt water, or performing chelating after addition of an acid component for dissolution of the precipitate or suspended solid in the case of the precipitate or suspended solid contained therein, to generate secondary salt water

Method and device for manufacturing sodium hypochlorite solution

To provide an electrolytic apparatus and an electrolytic method which can remove a risk of reaching an explosion limit of hydrogen by gradual accumulation of a very small amount of gas in a circulation line of an electrolytic solution in an electrolytic process generating hydrogen. The electrolytic apparatusis characterized by including an anode gas feeding lineconnecting a gas phase regionto an anode side gas-liquid separation means in order to dilute the concentration of the hydrogen gas by feeding anode gas into the gas phase regionin which hydrogen gas can exist as a gas phase. By feeding at least a part of the anode gas to the gas phase regionwith the anode gas feeding line, the hydrogen gas in the gas phase regionis diluted with the anode gas so that the concentration of the hydrogen gas is surely less than a lower limit value of explosion limit.

Electrolysis apparatus and electrolysis method

Sulfuric acid electrolysis process wherein;

Sulfuric acid electrolysis process

The cleaning method by electrolytic sulfuric acid and the manufacturing method of semiconductor device comprising:

Cleaning method by electrolytic sulfuric acid and manufacturing method of semiconductor device

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Tamano, Japan

Hiroki Domon