Feeder and method for preparing aqueous solutions of solid...

C - Chemistry – Metallurgy – 02 – F

Patent

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C02F 1/72 (2006.01) B01F 1/00 (2006.01) B01F 15/04 (2006.01) C02F 1/00 (2006.01) G05D 9/00 (2006.01) B01F 15/00 (2006.01)

Patent

CA 2432844

A continuous method is provided for dissolving a solid oxidizer into an aqueous solution which yields a stream of the aqueous solution having a constant or near constant concentration of solid oxidizer. The method of the present invention includes (a) disposing a bed of solid oxidizer into a container; (b) introducing an aqueous solution below the top surface of the bed; and (c) removing any solution above the top surface of the bed while maintaining a constant or near constant level of aqueous solution above the bed. Preferably, step (c) is performed at about atmospheric pressure. This method can be achieved with a feeder that includes a tank for containing a bed of solid oxidizer and a disperser for introducing the aqueous solution into the tank. A sensor/control unit is provided for sensing a combined bed and aqueous solution volume within the tank and maintaining the combined volume within a predetermined range.

La présente invention concerne un procédé en continu de dissolution d'un oxydant solide en une solution aqueuse donnant un courant de solution aqueuse présentant une concentration en oxydant solide constante ou quasiment constante. A cet effet, on commence par disposer (a) dans un récipient un lit d'oxydant solide, puis on introduit (b) une solution aqueuse en dessous de la surface supérieure du lit. Il ne reste plus qu'à enlever (c) toute solution au-dessus de la surface supérieure du lit tout en maintenant un niveau constant ou quasiment constant de solution aqueuse au-dessus du lit. De préférence, l'enlèvement (c) se fait à pression proche de la pression atmosphérique. Ce procédé peut s'utiliser avec un distributeur qui comprend un récipient pour contenir un lit d'oxydant solide et un disperseur pour introduire la solution aqueuse dans le récipient. On dispose d'un module de détection et de régulation permettant, d'une part de déterminer un volume combiné de lit et de solution aqueuse dans le récipient, et d'autre part à maintenir dans une plage définie ce volume combiné.

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