| 摘要 |
A process for the production of essentially chlorine free chlorine dioxide whereby a flow of chlorine dioxide obtained from reduction of alkali metal chlorate and containing by-product of chlorine gas is absorbed in water and the chlorine gas is treated in the water solution with formic acid by addition of this to the water or to the water solution, whereby the addition of formic acid is made in addition to any existing by-product of formic acid from the chlorine dioxide production. The formic acid is added in an amount resulting in a mole ratio formic acid to chlorine gas of > 1:1.
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