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对加拿大一枝黄花碱-蒽醌化学浆D/CEpD和D/CEpD1EpD2漂白条件、漂白浆特性和D/CEpD漂白浆的打浆性能进行了研究。确定了较佳的D/CEpD和D/CEpD1EpD2漂白工艺。D/CEpD漂白较佳工艺条件:总用氯量为10%(D/C、D段用氯量比6.5∶3.5),Ep段H2O2用量1.0%。漂白浆指标:AP+AQ浆得率89.61%,卡伯值1.9,白度79.6%ISO,返黄值5.6,粘度718mL/g;KP+AQ浆得率91.00%,卡伯值1.3,白度82.3%ISO,返黄值4.7,粘度711mL/g。D/CEpD1EpD2漂白较佳工艺条件:总用氯量10%(D/C、D1和D2段用氯量比为6∶3∶1),Ep段H2O2用量1.5%。漂白浆指标为:AP+AQ浆得率88.11%,卡伯值1.2,白度83.8%ISO,返黄值4.0,粘度710mL/g;KP+AQ浆得率88.96%,卡伯值1.1,白度84.7%ISO,返黄值3.9,粘度709mL/g。
The bleaching conditions, the bleaching slurry characteristics and the beating performance of the bleached pullulan of Canadian ash root-anthraquinone chemical pulp D / CEpD and D / CEpD1EpD2 were studied. Determined better D / CEpD and D / CEpD1EpD2 bleaching process. D / CEpD bleaching preferred process conditions: the total chlorine content of 10% (D / C, D segment chlorine ratio 6.5: 3.5), Ep segment H2O2 dosage 1.0%. Bleaching pulp index: AP + AQ pulp yield 89.61%, Kappa 1.9, whiteness 79.6% ISO, yellowing 5.6, viscosity 718mL / g; KP + AQ pulp yield 91.00%, Kappa value 1.3, 82.3% ISO, back to yellow 4.7, viscosity 711mL / g. D / CEpD1EpD2 preferred bleaching process conditions: the total amount of chlorine 10% (D / C, D1 and D2 chlorine ratio of 6: 3: 1), Ep segment H2O2 dosage 1.5%. The bleaching pulp indexes were as follows: the AP + AQ pulp yield was 88.11%, the kappa number was 1.2, the whiteness was 83.8% ISO, the yellowing value was 4.0 and the viscosity was 710mL / g; the KP + AQ pulp yield was 88.96% Degree 84.7% ISO, back to yellow 3.9, viscosity 709mL / g.