蔗渣氧碱浆的臭氧漂白研究

Study on Ozone Bleaching of Bagasse Oxygen Alkaline Pulp

关键词:  蔗渣  氧碱浆  臭氧漂白  过氧化氢漂白  TCF漂白

Key Words:bagasse  oxygen alkaline pulp  ozone bleaching  hydrogen peroxide bleaching  TCF bleaching

摘要:本研究对清洁的臭氧以及过氧化氢氧系漂白工艺的蔗渣氧碱浆漂白效果进行了探索与优化。结果表明，在浆浓40%、臭氧浓度为0.9 kg/（min·t）（以绝干浆计）、常温漂白10 min、复合酸用量1.5%、pH值2.5的条件下，可获得理想的臭氧漂白蔗渣氧碱浆。该浆在氧碱浆基础上，白度从58.6%提高到74.5%，增加15.9个百分点；黏度从827 mL/g下降到780 mL/g，降低5.7%。最佳臭氧漂白条件下得到的纸浆再进行过氧化氢漂白或氧强化过氧化氢漂白，在纸浆黏度基本保持不变的条件下，纸浆白度达80%以上。

Abstract:In this study， it was explored and optimized the bleaching effects on bagasse oxygen alkaline pulp of clean ozone and oxygen bleaching processes with hydrogen peroxide. It was shown that the ideal ozone bleached bagasse oxygen alkaline pulp could be obtained under the conditions of the pulp concentration of 40%， ozone concentration of 0.9 kg/（min·t） （calculated as absolute dry pulp）， bleaching for 10 min at room temperature， compound acid dosage of 1.5%， and pH value of 2.5. Compared with original oxygen alkaline pulp， the whiteness of ozone bleached bagasse oxygen alkaline pulp increased from 58.6% to 74.5%， with an increase of 15.9 percentage points， and the viscosity of it decreased from 827 mL/g to 780 mL/g， with a decrease of 5.7%. When the viscosity of the pulp basically unchanged， the ozone bleaching pulp obtained under optimum conditions was further bleached with hydrogen peroxide or oxygen enhanced hydrogen peroxide， whose whiteness could be reached more than 80%.