Improved diffusivity of NaOH solution in autohydrolyzed poplar sapwood chips for chemi-mechanical pulp production.
Improved diffusivity of NaOH solution in autohydrolyzed poplar sapwood chips for chemi-mechanical pulp production.
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DOI：
10.1016/j.biortech.2018.03.020
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发表时间：
2018-03
影响因子：
11.4
通讯作者：
Honglei Zhang;Q. Hou;W. Liu;Zhen Yue;Xiaoya Jiang;Xixi Ma
中科院分区：
文献类型：
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作者：
Honglei Zhang;Q. Hou;W. Liu;Zhen Yue;Xiaoya Jiang;Xixi Ma
研究了白杨边材自水解后物理结构的变化及其对化学机械浆（CMP）碱液扩散性能的影响。以不同水解强度的白杨边材为原料，进行碱浸渍处理。结果表明，白杨边材自水解后，其体积孔隙率、持水能力和饱和吸水率均有所提高。此外，在径向上的有效毛细管截面积（ECCSA）和NaOH溶液在径向和轴向方向的扩散系数都增加。自水解预处理增强了碱液在白杨边材中的扩散性能，扩散系数径向增大幅度大于轴向。
This work investigated the changes in the physical structure of autohydrolyzed poplar sapwood chips and the effect on the subsequent alkali liquor diffusion properties for chemi-mechanical pulping (CMP). An alkali impregnation process was conducted by using the autohydrolyzed poplar sapwood with different levels of autohydrolysis intensity. The results showed that the volume porosity, water constraint capacity, and saturated water absorption of the autohydrolyzed poplar sapwood chips increased. Also, the effective capillary cross-sectional area (ECCSA) in the radial direction and the diffusion coefficients of NaOH solution in both the radial and axial directions all increased. Autohydrolysis pretreatment enhanced the alkali liquor diffusion properties in poplar sapwood chips, and the diffusion coefficient was increased more greatly in the radial direction than that in the axial direction.