| 摘要 |
A process for the production of chlorine dioxide by reacting an alkali metal chlorate, mineral acid and a reducing agent in such proportions that chlorine dioxide is produced in a reaction medium which is maintained at a temperature of 50 DEG C.-100 DEG C. and at an acidity within a range of 2-12 N and which is subjected to subatmospheric pressure sufficient for evaporating water. A mixture of chlorine dioxide and water vapour is withdrawn from an evaporation zone in the reaction vessel, and alkali metal sulphate is precipitated in a crystallization zone in the reaction vessel. The precipitated alkali metal sulphate is contacted with a saturated water solution of alkali metal sulphate whereafter neutral alkali metal sulphate is precipitated and dissolved in water. The water solution is brought to an electrochemical membrane cell in which sulphuric acid is formed in the anode compartment and alkali metal hydroxide in the cathode compartment. |
