中文摘要：

常压下采用硫酸盐法、亚硫酸氢盐法和有机溶剂法对分离杨木中的木质素进行了比较。实验方案采用正交试验设计，结果表明：3种方法处理木屑对木质素的去除率分别为：硫酸盐法55．8％，亚硫酸氢盐法47．3％，有机溶剂法83．3％，结果显示有机溶剂法对分离木质素的效果最好，该法所得固体物中木质素的残留率最低，仅为6．3％。通过对有机溶剂法所得的废液进行蒸馏，可得到木质素，其得率为原料中所含木质素的82．11％，回收率达98、75％。回收的有机溶剂经处理可循环使用。

英文摘要：

Under ordinary pressure, the methods of Kraft cooking, bisulfite cooking and organic solvents cooking were compared for the effects of separating lignin in Populus alba L.. The experiments were carried out by orthogonal design, the results indicated： the removing yield of lignin from the saw dust of P. alba was 55.8 % for the Kraft cooking, 47.3 % for the bisulfite cooking, and 83.3 % for organic solvents cooking. It showed that organic solvents cooking process performed the best effect of separating lignin, and the residue yield of lignin was the lowest in the solid phase extracts, only 6.3 %. Distilling the waste liquid, lignin could be obtained, the yield of which reached to 82.11% of the content of lignin in the raw material, and the recovery yield of lignin arrived 98.75 %. Organic solvents could be recovered and recycled.