Pulp bleaching apparatus and method

Details Pulp bleaching apparatus and method Pulp bleaching apparatus and method

D - Textiles, Paper

21

C

D21C 9/153 (2006.01) B01F 15/00 (2006.01) D21C 9/10 (2006.01)

Patent

CA 2128241

An apparatus and method for bleaching high consistency lignocellulosic pulp using ozone supplied in an ozone containing gas. The bleaching reactor apparatus according to the invention is a generally cylindrical vessel (42A, 42B) with a rotatable shaft (48B) having radially extending paddles (52B) or other conveying elements arranged in a configuration to minimize axial dispersion of the pulp and maximize radial dispersion of the pulp to provide a radially dispersed plug flow of pulp through the reactor in the presence of the ozone to provide substantially uniformly bleached pulp.

L'invention se rapporte à un appareil et à un procédé pour blanchir la pulpe lignocellulosique à haute consistance à l'aide d'ozone contenu dans un gaz. Le réacteur de blanchiment est, selon l'invention, un récipient généralement cylindrique (42A, 42B) à arbre rotatif (48) pourvu d'ailettes s'étendant radialement (52B) ou d'autres éléments transporteurs disposés dans une configuration permettant de minimiser la dispersion axiale de la pulpe et de maximiser sa dispersion radiale pour produire un écoulement idéal de la pulpe dispersé radialement dans le réacteur, en présence de l'ozone, afin d'obtenir une pulpe pratiquement uniformément blanchie.

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