Method of treating residual acid

Details Method of treating residual acid Method of treating residual acid

D - Textiles, Paper

21

C

D21C 11/02 (2006.01) A62D 3/30 (2007.01)

Patent

CA 2424075

A method of treating residual acid from production of chlorine dioxide is described. The method is charac- terised in that a compound containing iron is added to the residual acid to react therewith and form a product, which contains iron in trivalent form. As iron compound preferably ferrous sulphate is added, which under oxida- tion reacts with the residual acid to form ferric salt. Preferably sodium chlorate, sodium hypochlorite, hydrogen peroxide or an oxygen-containing gas is added as oxidant.

L'invention porte sur une méthode de traitement d'un acide résiduel pour la production de dioxyde de chlore. La méthode est caractérisée en ce qu'un composé contenant du fer est ajouté à l'acide résiduel pour provoquer une réaction et produire un produit, lequel contient du fer sous la forme trivalente. On ajoute un composé ferreux, de préférence du sulphate de fer, qui sous l'action de l'oxydation réagit avec l'acide résiduel pour former de l'acide ferrique. De préférence, on ajoute, comme oxydant, du chlorate de sodium, de l'hypochlorite de sodium, du peroxyde d'hydrogène ou un gaz contenant de l'oxygène.

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