Process for producing chlorine dioxide

C - Chemistry – Metallurgy – 01 – B

Patent

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Details

C01B 11/02 (2006.01) B01F 5/02 (2006.01) B01F 5/04 (2006.01) B01J 4/00 (2006.01) B01J 14/00 (2006.01) B01J 19/24 (2006.01)

Patent

CA 2517079

The invention relates to a process for continuously producing chlorine dioxide comprising the steps of: diluting sulfuric acid of an initial concentration exceeding about 90 wt % with water; bringing the diluted sulfuric acid to a temperature below about 100 ~C; feeding to a reactor the diluted sulfuric acid having a temperature below about 100 ~C through a first feeding nozzle; feeding to said reactor (5) an aqueous solution comprising alkali metal chlorate and hydrogen peroxide through a second feeding nozzle, wherein said first and second feeding nozzles (1, 2) 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. The invention further relates to an apparatus for producing chlorine dioxide.

L'invention concerne un procédé de production continue de dioxyde de chlore. Ce procédé consiste à: diluer dans l'eau de l'acide sulfurique d'une concentration initiale dépassant environ 90 % en poids; à amener l'acide sulfurique dilué à une température inférieure à environ 100 ·C; à céder l'acide sulfurique dilué ayant une température inférieure à environ 100 ·C à un réacteur par une première buse d'alimentation; à céder à ce réacteur (5) une solution aqueuse contenant un chlorate de métal alcalin et du péroxyde d'hydrogène par une deuxième buse d'alimentation, cette première et cette deuxième buses d'alimentation (1, 2) étant opposées et tournées l'une vers l'autre; à faire réagir le chlorate de métal alcalin avec un acide minéral et le péroxyde d'hydrogène pour former un flux produit contenant le dioxyde de chlore et à retirer le flux produit du réacteur. L'invention concerne également un appareil destiné à la production de dioxyde de chlore.

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