DELIGNIFICATION OF EUCALYPTUS-GLOBULUS WOOD BY ETHANOL WATER SOLUTIONS IN BATCH AND FLOW-THROUGH-REACTOR - EFFECT OF PRESSURIZED OXYGEN ADDITION

被引：11

作者：

NETO, CP

ROBERT, A

机构：

来源：

HOLZFORSCHUNG | 1992年 / 46卷 / 01期

关键词：

DELIGNIFICATION; SOLVOLYSIS; ETHANOL WATER PULPING; OXYGEN; BATCH COOKING; FLOW-THROUGH-REACTOR; EUCALYPTUS-GLOBULUS;

D O I：

10.1515/hfsg.1992.46.1.69

中图分类号：

S7 [林业];

学科分类号：

0829 ; 0907 ;

摘要：

We have studied the delignification of E. globulus wood by water-ethanol mixtures (50:50, V/V) at 160-degrees-C, without any chemical additive. In the absence of oxygen, the best results were obtained by percolation of liquor in flow-through-reactor or with higher liquor-to-wood ratios (> 10) in batch cookings; but delignification is always limited. In the presence of oxygen under pressure (15 bar at 25-degrees-C), a net increase was observed in both the reaction kinetics and degree of delignification. For well delignified pulps, the yields remain satisfactory; nevertheless, DPBAR values were low as a consequence of the fiber degradation by oxygen. The mechanisms of delignification are discussed and reaction pathways are proposed.

引用

页码：69 / 76

页数：8

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