混合商品桉木片原料硫酸盐浆氧脱木素工艺优化

Optimization of Oxygen Delignification Process for Sulfate Pulp of Mixed Eucalyptus Wood Chips

针对混合商品桉木片硫酸盐法制浆漂白过程强度损失较为严重问题,利用正交实验方法完成混合商品桉木片硫酸盐浆氧脱木素工艺优化,确定在NaOH用量2%、时间60,min、温度100,℃、氧压0.5,MPa、MgSO4用量0.2%的条件下,纸浆的打浆度为15°SR,其抗张指数达到39,N·m/g以上,黏度>780,mL/g.通过单因素实验,进一步探讨氧脱木素工艺中NaOH用量对于纸浆性能的影响,提出氧脱木素工段NaOH用量与纸浆黏度、卡伯值分别具有线性关系:Yη=-17.84,XNaOH+829.92,R2=0.989,8;Ykappa=-0.62,X NaOH+10.56,R2=0.995,9.

When the mixed eucalyptus wood chips were used in the kraft pulping and bleaching,strength loss was a rela-tively serious problem. The optimum parameters in the oxygen delignification for the sulfate pulp of mixed eucalyptus wood were obtained via orthogonal experiments.The alkali charge,reaction time,reaction temperature,oxygen pressure and dos-age of MgSO4,were 2%,60,min,100,℃,0.5,MPa and 0.2%,respectively. Under the optimum process conditions,the tensile index and viscosity were respectively higher than 39,N＆#183;m/g and 780,mL/g while the beating degree of pulp was 15＆#176;SR. The influence of the dosage of NaOH on slurry ability in the oxygen delignification was further studied with single factor experi-ments,in order to put forward the linear relationship between the dosage of NaOH,kappa number and the viscosity of the pulp：Yη=-17.84,XNaOH＋829.92,R2=0.989,8;Ykappa=-0.62,X NaOH＋10.56,R2=0.995,9.