High temperature peroxide bleaching of mechanical pulps

High temperature peroxide bleaching of mechanical pulps

The present invention is directed to processes for producing mechanical pulps, and more particularly to hydrogen peroxide bleaching of thermomechanical pulps and the resultant pulps made therefrom. A method of making bleached mechanical pulps is disclosed for pulping mills having a primary and a sec...

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Hauptverfasser: Haynes, Kaaren K, Campbell, Roger O, Brooks, Zeecha L, Parrish, Anthony, Hamilton, Robert T
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Sprache:eng
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creator Haynes, Kaaren K
Campbell, Roger O
Brooks, Zeecha L
Parrish, Anthony
Hamilton, Robert T
description The present invention is directed to processes for producing mechanical pulps, and more particularly to hydrogen peroxide bleaching of thermomechanical pulps and the resultant pulps made therefrom. A method of making bleached mechanical pulps is disclosed for pulping mills having a primary and a secondary refiner. A first step is to provide cellulosic materials, such as wood chips to refine into the pulp; the wood chips have an initial brightness level. A second step is to provide a bleaching liquor to the refining system of the pulp mill, wherein the liquor comprises an amount of hydrogen peroxide and an amount of alkali having greater than 0% to 100% magnesium hydroxide or soda ash or a combination thereof. A third step is to hold the pulp with the bleaching liquor at a temperature in the range of about 85° to about 160° C. and for about 2 to about 180 minutes. The components of the bleach liquor can be added at the first refiner or interstage between refiners.
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title High temperature peroxide bleaching of mechanical pulps
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