ACID-EXTRACTION OF THE ALKALINE WOOD PULPS (KRAFT OR SODA/AQ) BEFORE OR DURING BLEACHING REASON AND OPPORTUNITY

被引：27
|
作者：
MARECHAL, A
机构：
[1] Laboratoire de Genie des Procédés Papetiers, Associéau CNRS n° l 100, Institut National Polytechnique de Grenoble, Ecole Francaise de Papeterie et des Industries Graphiques, Domaine Universitaire, St Martin d'Hères Cedex
来源：
JOURNAL OF WOOD CHEMISTRY AND TECHNOLOGY | 1993年 / 13卷 / 02期
关键词：
D O I：
10.1080/02773819308020517
中图分类号：
TB3 [工程材料学]; TS [轻工业、手工业、生活服务业];
学科分类号：
0805 ; 080502 ; 0822 ;
摘要：
The decreases in kappa number of an unbleached alkaline hardwood pulp of carpinus betulus when performing dilute H2SO4 hydrolysis at about 100-degrees-C, either after or before oxygen bleaching are the same. The main parameters of this acid hydrolysis are specified by studying the acidification of unbleached alkaline pulp suspensions at room temperature, and the extraction kinetics at temperatures in the range of 88-degrees-110-degrees-C by following UV absorbance of the hydrolysis liquors. Among the dissolved products in the liquors 2-furancarboxylic acid has been identified. This acid results probably from the degradation in the acid medium of compounds present in the unbleached alkaline pulp, which are not oxidized by oxygen in the alkaline medium.
引用
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页码：261 / 281
页数：21
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