Process for bleaching pulp

Details Process for bleaching pulp Process for bleaching pulp

D - Textiles, Paper

21

C

D21C 9/10 (2006.01)

Patent

CA 2703023

A process for the bleaching of wood pulp using one or more peroxide oxidising agents wherein the process includes treatment of the pulp with a mixture of chelating agents comprising: (a) a first chelating agent selected from the group consisting of: ethylenediamine N,N -disuccinic acid, methylglycinediacetic acid, glutamic acid N,N-diacetic acid, imino disuccinic acid and anions and mixtures thereof; and (b) a second chelating agent selected from the group consisting of: diethylene triamine pentaacetic acid, ethylenediamine tetraacetic acid, diethylenetriamine penta methylene phosphonic acid and anions and mixtures thereof.

L'invention porte sur un procédé de blanchiment de pâte de bois qui fait appel à au moins un agent oxydant peroxyde, lequel procédé consiste à traiter la pâte avec un mélange d'agents chélateurs comprenant: (a) un premier agent chélateur choisi dans le groupe composé de : l'acide éthylènediamine N,N -disuccinique, l'acide méthylglycinediacétique, l'acide glutamique N,N-diacétique, l'acide imino disuccinique et des anions et mélanges de ces derniers; et (b) un second agent chélateur choisi dans le groupe composé de: l'acide diéthylène triamine pentaacétique, l'acide éthylènediamine tétraacétique, l'acide diéthylènetriamine penta méthylène phosphonique et des anions et mélanges de ces derniers.

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