桉木AS-AQ蒸煮及木质素特性研究

林产化学与工业 ›› 2004, Vol. 24 ›› Issue (S1): 107-110.

桉木AS-AQ蒸煮及木质素特性研究

周学飞

昆明理工大学生物与化学工程学院, 云南昆明 650224

收稿日期:2003-08-18 修回日期:1900-01-01 出版日期:2004-10-20 发布日期:2004-10-20

AS -AQ PULPING OF EUCALYPTUS WOOD AND THE STRUCTURAL CHANGE OF LIGNIN DURING PULPING

ZHOU Xue -fei

College of Biological and Chemical Engineering, Kunming University of Science and Technology, Kunming 650224, China

Received:2003-08-18 Revised:1900-01-01 Online:2004-10-20 Published:2004-10-20

摘要/Abstract

摘要： 实验结果表明,桉木AS-AQ蒸煮到145℃以前,木质素磺化反应占主导地位,温度升高木质素大量溶出;蒸煮后期,残余木质素和溶出木质素发生缩合反应,从而导致纸浆的KMnO₄值上升,白度下降。通过实验,论证了纸浆中残余木质素含量高的原因。

关键词: 脱木质素, 磺化反应, 残余木质素

Abstract: AS -AQ pulping of eucalyptus (Leizhou No.1) wood and the structural change of lignin during pulping were studied. It was found that the lignin in eucalyptus has guaiacyl-syringyl-p-hydroxylphenyl (G -S -H) structural characteristics. The ratio of S:G is 1.25:1. The M_w is 6 784,M_n is 5585.The guaiacyl groups in lignin was dissolved faster than syringyl groups in lignin during AS -AQ pulping.The sulfonation reaction and delignification rate of lignin in secondary walls(S) were slower than that in cell corner (CC) and compound middle lamella (CML) during AS -AQ pulping, so that residual lignin content in AS -AQ pulp was higher. Condenzation of lignin was occurred at the end of cooking, so that the permanganate number of pulp was raised and the brightness of pulp was reduced.

Key words: delignification, sulfonation reaction, residual lignin

中图分类号:

周学飞. 桉木AS-AQ蒸煮及木质素特性研究[J]. 林产化学与工业, 2004, 24(S1): 107-110.

ZHOU Xue -fei. AS -AQ PULPING OF EUCALYPTUS WOOD AND THE STRUCTURAL CHANGE OF LIGNIN DURING PULPING[J]. , 2004, 24(S1): 107-110.

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