Abstract: A shaped article of collagen having 5 to 20 .mu.m of thickness, the peak maximum temperature of endothermic denaturation thereof being in the range of 62.degree. to 71.degree. C., the wet tensile strength thereof being in the range of 3 to 6 kg/mm.sup.2 and the wet tear strength thereof being in the range of 25 to 150 g.multidot.cm/cm is prepared by a process comprising cross-linking a collagenous material so that the difference of the peak maximum temperatures of endothermic denaturation of the material between before and after the cross-linking falls in the range of 1.0.degree. to 10.degree. C. and the peak maximum temperature after the cross-linking falls in the range of 63.degree. to 74.degree. C., fibrating the cross-linked collagenous material to prepare an aqueous dispersion with the viscosity of 100 to 2000 cP and the spinnability of 30 to 80 mm at the concentration of 1% by weight of collagen fiber and subjecting the dispersion to electrodeposition.

Abstract: The invention resides in an electrolytic cell element representing a frame structure defining partially an anode chamber and a cathode chamber. The frame is composed of a carbon fiber-high polymer composite material.

Abstract: 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 from its neighboring chamber by means of a cationic permselective 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 radial, a pendant type phenolic radical or derivative thereof. The inventive process, which utilizes the above-described apparatus is characterized in that it utilizes a caustic alkali concentration in the intermediate chamber which ranges from about 10-20 wt.

Abstract: An electrolytic bath vessel assembly adapted for use to electrolytic treatment of salt water for the manufacture of caustic soda solution. The assembly includes a unique arrangement of bar electrodes, equidistantly positioned in parallel and at the both sides of a finely pored separating membrane.

Abstract: 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.

Abstract: A diaphragm for electrolytic production of caustic alkali which consists of dual microporous layers provided on the anode and cathode sides, wherein the anode side microporous layer is made of an acid-resistant material 0.01 to 0.3 millimeter thick bored with micropores having a mean diameter of 0.05 to 1.5 microns, and the cathode side microporous layer is formed of an alkali-resistant material 1 to 6 millimeters thick bored with micropores having a diameter of 3 to 100 microns.

Abstract: An improvement on the known brine-chlorine gas separting vessel disposed on the anode chambers of a vertical diaphragm type electrolytic cell for caustic soda production by connecting said brine-chlorine gas separating vessel to a secondary brine-chlorine gas separating vessel through a chlorine gas pipe and a brine pipe, and connecting the secondary brine-chlorine gas separating vessel to a tertially brine-chlorine gas separating vessel similarly through a chlorine gas pipe and a brine pipe.

Abstract: In a caustic alkali producing multiple vertical diaphragm type electrolytic cell, wherein a plurality of vertical flat box shaped unit anode chamber sets are assembled in parallel in a large cell case acting as a common cathode chamber, each said unit anode chamber set comprising an anode chamber, both main walls of which are formed of a pair of diaphragms and a pair of cathode wire nets stretched on the outside of said diaphragms, and a pair of anode plates received in said anode chamber so as to face said diaphragms, an improvement characterized in that, where the plural unit anode chamber sets are assembled in parallel in the cell case, the cathode wire nets can be electrically connected easily to the cathode bottom plate of said cell case by press-mounting the unit anode chamber sets thereon.