Hydrogen Peroxide → Oxygen

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Referring to the FIGURE, sulfuric acid and a pre-mixed aqueous solution of sodium chlorate and hydrogen peroxide are fed to a vertical through-flow tubular reactor 1 and reacted therein to form a product stream 2 of liquid and foam comprising chlorine dioxide, oxygen, sodium sulfate and some remaining sulfuric acid and sodium chlorate. An eductor 3 is supplied with motive water 4 and generates a slightly subatmospheric pressure bringing the product stream out from the reactor 1 into the eductor 3 where it is mixed with the motive water to form a diluted product stream 5, which is brought to a tank 6. A part of the diluted product stream is withdrawn from the tank by a pump 8 as a final product 9, i.e. an aqueous solution comprising chlorine dioxide. The tank 6 is provided with a fan 7 venting out oxygen that goes off from the diluted product stream therein. The non-withdrawn part of the diluted product solution is brought out from the tank 6 by the pump 10 and mixed with cold water 11, e.g. having a temperature from about 1 to about 20° C., preferably from about 4 to about 10° C., to form a recycle stream 12. The gas vented out from the tank 6 may also contain some chlorine dioxide and to minimize the losses thereof it is possible to scrub the gas with water to absorb most of the chlorine dioxide (not shown in the FIGURE) and return it to the diluted product stream or the recycle stream. The recycle stream 12 is returned to the eductor and fed thereto as motive water 4. In a process producing a 6 grams ClO2/litre product solution 9 it may be suitable to add enough water to obtain a recycle stream 12 comprising from about 3 to about 4.5 grams ClO2 per litre, depending on how efficient the eductor is. In order to produce a 10 grams ClO2/litre product solution 9 it may be suitable to add enough water to obtain a recycle stream 12 comprising about 7 grams ClO2 per litre.

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