Fleit & Jacobson
Apparatus and process for the electrolytic treatment of alkali metal halide solution with ion exchange membranes
 This invention relates to an apparatus for the electrolytic treatment of alkali halide solution in a three chamber type electrolytic bath assembly comprising an anodic chamber, an intermediate chamber and a cathodic chamber arranged one after another in series. Each chamber is separated from its neighboring chamber by means of an anodic ion exchange membrane. The apparatus is characterized, according to this invention, in that the first one of the membranes separating the intermediate and anodic chambers is made of a fluorine-containing resin, while the second membrane separating the intermediate and cathodic chambers includes, as its main ion exchange radical, a pendant type phenolic radical or derivative thereof. The inventive process, which utilizes the above-described apparatus characterized in that it utilizes a caustic alkali concentration in the intermediate chamber which ranges from about 10 - 20 wt. % while the output caustic alkali developed at and delivered from the cathodic chamber amounts to a concentration ranging from about 30 to 50 wt. %. 
Kureha Kagaku Kogyo Kabushiki Kaisha
C C C C
C25B C08J C08J C08J
inventional inventional additional inventional
Teruo Makoto Naohiro Toshio Yoshikazu Shirou
Sakagami Fukuda Murayama Enoki Kokubu Suzuki