C - Chemistry – Metallurgy – 12 – N
Patent
C - Chemistry, Metallurgy
12
N
C12N 9/24 (2006.01) C12N 1/20 (2006.01) C12P 19/14 (2006.01) C12S 3/08 (2006.01) D21C 5/00 (2006.01) D21C 9/10 (2006.01)
Patent
CA 2191859
The present invention concerns a method for enzymatic treatment of lignocellulosic materials which contain xylan-polymers, such as cellulose kraft pulps. According to a method of the present kind, at least a part of the hexenuronic acid groups present in the material is selectively removed in order to remove metal ions from the pulp, to change the surface charge thereof, to improve the brightness stability of the pulp and to render the material more suitable for enzymatic treatment.
La présente invention concerne un procédé de traitement enzymatique de lignocelluloses contenant des polymères du type xylane, telles que les pâtes de cellulose Kraft. Dans le présent procédé, au moins une partie des groupes d'acide hexénuronique présents dans le produit sont éliminés d'une manière sélective pour extraire les ions métalliques de la pâte, changer sa charge de surface, améliorer la stabilité du brillant de la pâte et obtenir un produit se prêtant mieux à un traitement enzymatique.
Bailey Michael
Buchert Johanna
Siika-Aho Matti
Teleman Anita
Tenkanen Maija
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
Valtion Teknillinen Tutkimuskeskus
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