Process of producing chlorine dioxide

Details Process of producing chlorine dioxide Process of producing chlorine dioxide

1997-02-28

1999-01-12

Nguyen, Ngoc-Yen

Chemistry of inorganic compounds

Halogen or compound thereof

Chlorine dioxide

205510, C01B 1102

Patent

active

058583220

ABSTRACT:
The invention relates to a process of producing chlorine dioxide comprising the steps: Providing a reactor with an aqueous acidic reaction medium containing alkali metal chlorate and sulfate; reducing chlorate ions in said reaction medium to form chlorine dioxide; maintaining the reaction medium at subatmospheric pressure sufficient to evaporate water and precipitate alkali metal sulfate; withdrawing chlorine dioxide and evaporated water from the reactor; withdrawing reaction medium containing solid alkali metal sulfate from the reactor and separating the solid material from said reaction medium; transferring reaction medium substantially free from solid alkali metal sulfate to an electrochemical cell in which the acidity of said reaction medium is increased and the content of alkali metal ions is decreased; recycling electrochemically acidified reaction medium to the reactor for producing chlorine dioxide; and adding make up alkali metal chlorate and sulfuric acid.

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