硫酸盐蔗渣浆全无氯短序漂白生产工艺的研究

Study on the Chlorine-free Short Sequence Bleaching Process of Kraft Bagasse Pulp

关键词:  硫酸盐蔗渣浆  高浓臭氧反应器  短序漂白  全无氧漂白

Key Words:sulfate bagasse pulp  high concentration ozone reactor  short sequence bleaching  total chlorine free

摘要:在尽可能模仿工厂实际生产条件下，采用酸处理-臭氧-过氧化氢（AZP）全无氯（TCF）短序清洁漂白生产流程对硫酸盐蔗渣浆漂白工艺参数进行研究。实验结果表明，硫酸盐蔗渣浆漂白最佳工艺条件为：Z段浆浓36%，pH值2.0，臭氧用量1.2%，臭氧浓度120 g/m³，反应时间30 min，室温下进行；P段浆浓10%，过氧化氢用量3.0%，反应时间120 min，反应温度90℃，NaOH用量0.8%。最终得到的漂白硫酸盐蔗渣浆白度85.6%、黏度559 mL/g以及卡伯值3.6。同时，与传统漂白工艺流程（OQP₁P₂、OP₁ZP₂）相比，采用AZP短序漂后废水污染负荷最低，漂后废水COD_Cr为760 mg/L、BOD₅为90 mg/L以及色度为680 C.U.。

Abstract:With the conditions closely imitating the practice production of the mill, the parameters of sulfate bagasse pulp acid pretreatment-ozone-hydrogen peroxide (AZP) short sequence total chlorine free (TCF) bleaching process were studied. The experimental results showed that the optimum process conditions were: pulp consistency 36%, pH value 2.0, ozone dosage 1.2%,ozone concentration 120 g/m³， reaction time 30 min, at room temperature for Z-stage; for P-stage pulp consistency 10%, the peroxidation dosage 3%, reaction time 120 min, reaction temperature 90℃, NaOH dosage 0.8%. The whiteness, viscosity and Kappa number of the bleached kraft bagasse pulp were 85.6%, 559 mL/g and 3.57, respectively.At the same time, compared with the traditional bleaching processes (OQP₁P₂, OP₁ZP₂), the pollution load was the lowest when AZP short sequence bleaching was applied, COD_Cr value was 760 mg/L, BOD₅ was 90 mg/L, and chroma value was 680 C.U.