Xylanase-induced reduction of chlorine dioxyde consumption during elemental chlorine-free bleaching of different pulp types

摘要

The potential of crude xylanase from Thermomyce lanuginosus and Xylanase P (a commercial xylanase) was evaluated in bleaching of various paper pulp types.Xylanases released chromophores and reducing sugars and decreased kappa number of pulps.Chlorine-Bleached,Alkali-extracted bagasse and post-oxygen kraft pulps,pretreated with enzymes,Gained over 5 brightness points over controls.Biobleaching of sode-aq pulp with Xylanase P produced chlorine dioxide savings of up to 30precent or 4.5 kg chlorine dioxide t~(-1) pulp.