D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
D21C 9/14 (2006.01)
Patent
CA 2372069
The present invention refers to a process for bleaching chemical pulps comprising a step of adding chlorine dioxide in a pH in the range of about 4.5 to 5.5 as the first bleaching stage. The process of the present invention provides for obtaining contents of organic halogen compounds in the final pulp product lower than 30 ppm and for a reduction in the H2O2 needed for the subsequent stages.
La présente invention concerne un procédé permettant de blanchir des pâtes chimiques. Lequel procédé comprend plusieurs étapes, la première étape de blanchiment consistant à ajouter du dioxyde de chlore à un pH compris entre environ 4,5 et 5,5. Le procédé décrit dans la présente invention permet d'obtenir une pulpe finale présentant des teneurs en composés halogénés organiques inférieures à 30 ppm ainsi qu'une réduction de H¿2?O¿2? nécessaire pour les étapes de blanchiment ultérieures.
Pasquali Silvia Maria
Tedeschi de Araujo Guilherme Antonio
Aracruz Celulose S.a.
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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