| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for electrolyzing an alkali metal chloride including a saturated brine preparation stage, an electrolysis stage, a chlorine degassing stage and a chlorine adsorption/removal stage with active carbon, improved in such a manner that the prevention in the reproduction of halobacteria in the chlorine adsorption/removal stage can be attained. SOLUTION: A water feeding means is provided in a chlorine adsorption/removal stage to reduce the concentration of a salt in water contacted with active carbon. In a preferable embodiment after the chlorine adsorption/removal stage, as a Glauber's salt removal stage, the stage wherein plain brine and water are alternately passed into a separation column filled with an ion exchanger, an effluent mainly comprising an alkali metal chloride and an effluent comprising a sulfate are separated, so as to be recovered, further, the former is circulated through the saturated brine preparation stage and the latter is removed to the outside of the circulation system is provided. COPYRIGHT: (C)2006,JPO&NCIPI
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