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研究了蔗渣Soda-AQ浆二氧化氯脱木素(D0)效率的影响因素,得到最佳脱木素工艺条件为ClO2用量0.8%,终点pH值范围为4.0～4.5,反应温度70℃,反应时间60min。在此基础上经D1P和D2P短序ECF漂白后(ClO2用量分别为0.8%和1.0%,H2O2用量2%),蔗渣浆白度分别达到80.2%和81.4%,且具有较好的物理强度。纸浆FT-IR谱图分析表明:蔗渣浆经ClO2脱木素后,纸浆中的羟基和羰基数量增多,愈疮木基和紫丁香基木素单元均受到一定程度的破坏,经H2O2进一步漂白后,木素结构中苯环的特征峰逐渐减弱以至消失,羰基等主要发色基团逐渐减少,纸浆白度得到提高。
The effects of factors on the efficiency of delignification (D0) of bagasse Soda-AQ pulp were studied. The optimum conditions of delignification were as follows: the dosage of ClO2 was 0.8%, the final pH range was 4.0-4.5, the reaction temperature was 70 ℃, the reaction Time 60min. On the basis of this, the whiteness of bagasse pulp reached 80.2% and 81.4% respectively after being bleached by D1P and D2P short-order ECFs (0.8% and 1.0% for ClO2 and 2% for H2O2) respectively, and had better physical strength. FT-IR spectra of pulp showed that the amount of hydroxyl groups and carbonyl groups in pulp increased with the delignification of ClO2, and both the guaiacyl and lilac-based lignin units were destroyed to a certain degree. After further bleaching by H2O2 , The characteristic peaks of benzene ring in lignin structure gradually weakened and even disappeared, the major chromophore groups such as carbonyl groups gradually decreased, and the whiteness of pulp was improved.