ELECTRODIALYZER

PROBLEM TO BE SOLVED: To provide an apparatus for producing acid/alkali from a neutral salt by novel-type ionization without use of a bipolar membrane, or concentrating and regenerating the acid or the alkali. SOLUTION: The electrodialyzer is characterized in that cation exchange membranes and anion exchange membranes are alternately arranged between an anode and a cathode to form a plurality of chambers, an anode chamber is defined by the anode and the cation exchange membrane, a pair of chambers in which an acid chamber, an ionization chamber, an alkali chamber and a hydrolysis chamber are successively arranged from the anode side, are arranged adjacent to the anode chamber, or two or more pairs thereof are repeatedly arranged, and the hydrolysis chamber nearest to the cathode is defined as the cathode chamber. COPYRIGHT: (C)2007,JPO&INPIT