2011•China Pulp & Paper IndustryRequires access
A study on two-stage oxygen delignification for Eucalyptus kraft pulp
Ruirui Li
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Abstract
The amount of alkali,oxygen pressure,tempera-ture and total time of two-stage oxygen delignification were fixed,the effect of the time distribution of two-stage oxygen delignification on oxygen delignification was studied.The results show that the Kappa number,the brightness,viscos-ity of the two-stage oxygen delignification pulp are 10.39,54.30%ISO,757.0ml/g respectively,as the first-stage oxygen delignification time was 20 minute and the second-stage oxy-gen delignification time was 60 minute.There are no differ-ences in Kappa number,the brightness and the yield,com-pared with one stage oxygen delignification pulp.But the viscosity of two-stage oxygen delignification pulp is higher 68.5ml/g than one stage oxygen delignification pulp.