Process for producing chlorine dioxide

A process for continuously producing chlorine dioxide comprising the steps of:

• diluting sulfuric acid of a concentration exceeding about 90 wt % with water to a concentration from about 60 to about 90 wt %,
• cooling the diluted sulfuric acid to a temperature below about 95° C.;
• feeding to a reactor the diluted and cooled sulfuric acid through a first feeding nozzle;
• feeding to said reactor an aqueous solution comprising alkali metal chlorate and hydrogen peroxide through a second feeding nozzle, wherein said first and second feeding nozzles are opposite to and directed against each other;
• reacting the alkali metal chlorate with the mineral acid and the hydrogen peroxide to form a product stream containing chlorine dioxide;
• and,
• withdrawing the product stream from the reactor and bringing it to an eductor in which it is diluted with motive water to form an aqueous solution containing chlorine dioxide.

A process for continuously producing chlorine dioxide comprising the steps of:

• diluting sulfuric acid of a concentration exceeding 90 wt % with water to a concentration from about 60 to about 90 wt %;
• cooling the diluted sulfuric acid to a temperature below about 100° C.;
• feeding the diluted and cooled sulfuric acid through a first feeding nozzle to a substantially vertically arranged substantially tubular through flow reactor;
• feeding to said reactor an aqueous solution comprising alkali metal chlorate and hydrogen peroxide through a second feeding nozzles, wherein said first and second feeding nozzles are opposite to and directed against each other;
• reacting the alkali metal chlorate with the mineral acid and the hydrogen peroxide to form a product stream containing chlorine dioxide;
• and,
• withdrawing the product stream from the reactor and bringing it to an eductor in which it is diluted with motive water to form an aqueous solution containing chlorine dioxide,
• wherein said first and second feeding nozzles are situated close to the bottom of the reactor and directed towards the centre line along the reactor.