Method for preparing delignified and bleached chemical paper...

Details Method for preparing delignified and bleached chemical paper... Method for preparing delignified and bleached chemical paper...

D - Textiles, Paper

21

C

D21C 9/16 (2006.01) D21C 9/10 (2006.01)

Patent

CA 2189796

A method wherein a cooked lignocellulose pulp is (a) delignified using oxygen, (b) processed with a transition metal complexing or sequestering agent and washed, and (c) processed with hydrogen peroxide in the presence of an alkali metal silicate at a temperature of over 100 ~C and at a pressure of 5-200 bar.

Ce procédé consiste à soumettre une pâte lignocellulosique par une cuisson à la séquence des traitements suivants: a) un traitement délignifiant par l'oxygène, suivi b) d'un traitement par un agent complexant ou séquestrant des métaux de transition suivi d'un lavage, puis c) d'un traitement par le péroxyde d'hydrogène, en présence de silicate d'un métal alcalin à une température supérieure à 100 °C et sous une pression de 5 à 200 bars.

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