Chlorine Engineers Corp., Ltd.

Toyo Soda Manufacturing Co., Ltd.

Teruo Ichisaka

Tadao Ikegami

Shinji Katayama

Kenzo Yamaguchi

Takao Satoh

Nobuhiro Kawasaki

Yoshitugu Shinomiya

Isao Kumagai

Masaki Murakami

Shigeaki Fuseya

The invention provides a process for reactivating an active cathode attached to an electrolyzer, wherein a porous cathode that is attached to the electrolyzer by means of a flexible member and has a decreased electrode catalyst activity is provided thereon with a fresh active cathode equivalent to, or smaller in wire diameter or pore diameter than, the porous cathode by bending a mounting piece formed around said fresh active cathode without removal of a deteriorated electrode catalyst substance.

Reactivation of active cathode

Process or producing caustic alkalis or alkali hydroxides by electrolysis, employing a double electrode-type electrolysis tank in which a cation exchange membrane is provided to divide the inside of the tank into cathode and anode compartments, supplying to the anode compartment an alkali chloride, supplying water or a dilute solution of an alkali hydroxide into the cathode compartment, and taking away the alkali hydroxide and the hydrogen gas produced by electrolysis, in a mixed state of gas and liquid from the cathode compartment. The electrolysis tank comprises a number of finger-anodes extending from one of the walls of the tank and a number of finger-like hollow cathodes extending from the other wall of the tank, into which the finger-anodes project to form a gap therebetween, and a cation exchange membrane extending through the gap to divide the inside of the tank into cathode and anode compartments.

Process for producing caustic alkalis

An electrolytic cell having a plurality of porous and tubular cathodes, a plurality of porous anodes and a plurality of bag-shaped molds being formed by a cation exchange membrane in at least the portions facing and between the vertical faces of the anode and cathodes. The anode accommodating bag-shaped molds have apertures at the bottom through which anode connected electroconductive bars extend, said bars being inserted through and secured at corresponding cell bottom plate apertures by flanges. A partition plate, on the top of the cell main body, has a plurality of openings which correspond to the open tops of the bag-shaped molds. The open top edges of the bag-shaped molds are secured to the partition plate openings by a plurality of lid members.

Electrolytic cell for ion exchange membrane method

An electrolytic cell for the ion exchange membrane method, which comprises:

In an apparatus for electrolyzing an aqueous solution, which includes a plurality of electrolytic cells disposed at a plurality of vertically spaced levels and divided by partitions from one another, each of said cells having at least one anode and at least one cathode, said cells including an uppermost cell having an inlet for said solution, and a lowermost cell having an outlet for said solution, the improvement wherein:

Apparatus for electrolyzing an aqueous solution

A filter-press type ion exchange membrane-method electrolysis cell comprising

Filter press type ion exchange membrane-method electrolysis cell

Method of making a bipolar electrode

Bipolar electrode

A bipolar electrode comprising A. an anode member comprising a substrate made of an anticorrosive metal or metal alloy and an electrically conductive coating formed on the surface thereof; B. a cathode member comprising a metal or a metal alloy; C. a partition wall for separating the anode member from the cathode member, the partition wall comprising an anode-side sheet made of the same type of anticorrosive metal or metal alloy used as the substrate of the anode member and a cathode-side sheet made of the same type of metal or metal alloy used as the cathode member; and D. a composite member for electrically and structurally connecting the anode member and the cathode member to each other.

Growing community of inventors

Tamano, Japan

Teruo Ichisaka