蔗渣不同组织对蒸煮与成浆过程的影响OA

The tissue heterogeneity of bagasse raw materials significantly affects the pulping performance.Different tissues composed of bagasse fiber cells(BF)and parenchyma cells(PC)were obtained by fractional separation and alkali cooking was carried out respectively to discuss the difference of cooking process in different tissue.The results showed that there were significant differences in Kappa value,black liquor lignin concentration,and delignification rate between 105 and 195 min.When the maximum cooking temperature was 160℃,the delignification turning points of vascular bundle tissue and parenchyma tissues appeared at 155 min(delignification rate of 71.34%)and 135 min(delignification rate of 78.45%),respectively,indicating that parenchyma tissue was easier to form pulp.The fluo-rescence distribution of lignin showed that the lignin in the secondary wall of the vascular bundle tissue was preferentially removed,while the lignin concentration in the primary wall,intercellular layer and cell corner area increased first and then decreased.The lignin concen-tration in the primary wall and intercellular layer of the parenchyma tissue decreased preferentially,and the cell corner area also in-creased first and then decreased.According to the difference of delignification in different tissue of bagasse,the regulation of pretreat-ment or segmented cooking provides data reference for improving the quality of bagasse pulp.