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Two enzyme treatments involving xylanase (X) and laccase (L) were used jointly in an XLE sequence (where E denotes alkaline extraction) to bleach oxygen-delignified eucalyptus kraft pulp in the presence of 1-hydroxybenzotriazol (HBT) as mediator. The results of the XLE sequence were compared with those of an LE sequence. The application conditions for the laccase–mediator system were optimized by...
This study shows that oxalic acid is a very effective additive for the ozone treatments compared with other additives. The required concentration is very small and even lower than the concentration formed during the stage itself. Several different mechanisms for the action of oxalic acid as an additive during the ozone bleaching are examined. He is advisable to have a pH acid during Z stage, but it...
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