桉木常规KP浆和RDH浆的氧脱木素研究(Ⅴ)——ClO_2预处理对RDH浆氧脱木素的改善效果

Oxygen Delignification of RDH Kraft Pulp from Eucalyptus after Chlorine Dioxide Pretreatment

研究了ClO2预处理对桉木RDH硫酸盐浆氧脱木素的影响。结果表明,在桉木RDH浆氧脱木素前,用少量ClO2,在低温下对浆料进行短时间的预处理,即可改善氧脱木素效果,降低氧漂浆的卡伯值,有效增加纸浆白度(如用0.3%ClO2,40℃下预处理5 min,脱木素程度增加10.6%,白度提高7.87个百分点),而预处理对纸浆黏度影响不大。

Effect of chlorine dioxide pretreatment on oxygen delignification of RDH（Rapid displacement heating） kraft pulp from eucalyptus was studied in the paper. The results showed that pretreatment with low charge of chlorine dioxide under the conditions of low temperature and short pretreatment time increased the efficiency of oxygen delignification of RDH pulp, and produced oxygen-delignified-pulp with lower kappa number and higher brightness compared with the pulp produced by single stage oxygen delignification. For example, when the pulp was pretreated with 0.3%ClO2 on 40℃ for 5 minutes, degree of oxygen delignification was increased by 10.6%, and brightness of oxygen bleached pulp increased by 7.87%ISO. Furthermore, chlorine dioxide pretreatment had little influence on viscosity of the pulp.