Asahi Kasei Kogyo Kabushiki Kaisha

Muneo Yoshida

Shinsaku Ogawa

Maomi Seko

Nobuo Ajiki

Yoshitomo Tamura

A chlor-alkali electrolytic cell with a cation exchange membrane is improved, with respect to eliminating local differences of electrolyte, by providing a duct to facilitate downward flow of electrolyte. The duct of this invention serves, without increase of current leakage, with results comparable to conventional forced circulation.

Electrolytic cell with ion exchange membrane

A bipolar system electrolytic cell having a partition wall made of explosion-bonded titanium plate and iron plate which is electrically connected to anode of titanium substrate at its titanium side and to cathode of iron at its iron side, space is preferably given between anode and the partition wall and also between cathode and the partition wall. An assembly having a number of such unit cells arranged in series is useful for electrolysis of sodium chloride which can be performed under a low voltage per unit cell.

Bipolar system electrolytic cell

In an electrolytic cell having cation exchange membrane as diaphragm to partition said cell into cathode and anode chambers, electrolysis of an electrolyte aqueous solution is conducted while generating gas from anode by keeping the inner pressure in cathode chamber higher than that in anode chamber. Some disadvantages caused in the case of electrolyzing an aqueous alkali metal halide solution to form alkali metal hydroxide in cathode chamber are overcome by adjusting the anolyte at pH &lt;3.5. The electrolytic cell preferably employable for the present process is also disclosed.

Electrolysis

In carrying out electrolysis of alkali halide in an electrolytic cell having anode and cathode chambers separated by a cation exchange membrane by feeding an aqueous alkali halide solution into the anode chamber to produce halogen gas in the anode chamber and caustic alkali and hydrogen gas in the cathode chamber, the electrolytic cell is pressurized at higher than atmospheric pressure to obtain various improved results.

Growing community of inventors

Nobeoka, Japan

Muneo Yoshida