| 摘要 |
PROBLEM TO BE SOLVED: To provide an improved method for electrolyzing an alkali metal chloride which is made industrially more advantageous by solving the deterioration problem of an ion exchanger in a demirabiliting stage, as a method for electrolyzing an alkali metal chloride including a saturated brine preparing stage, an electrolyzing stage, a dechlorinating stage and the demirabiliting stage, with the demirabiliting stage formed by a separation tower packed with an ion exchanger and with dilute brine and water passed alternately through the separation tower. SOLUTION: A chlorine decomposing and removing stage for decomposing and removing the residual chlorine in the dilute brine discharged from the dechlorinating stage with a reducing agent is provided between the dechlorinating stage and demirabiliting stage.
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