INFLUENCE OF GREEN LIQUOR AND HOT WATER PRE- EXTRACTION OF HARDWOODS ON KRAFT PULPING
INFLUENCE OF GREEN LIQUOR AND HOT WATER PRE- EXTRACTION OF HARDWOODS ON KRAFT PULPING
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硬木绿液和热水预萃取对牛皮纸制浆的影响
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
A. Act
中科院分区：
文献类型：
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作者：
E. Opálená;A. Act
在硫酸盐法制浆之前，用绿色液和热水预提取混合硬木碎片。热水浸提比用绿色溶液浸提（相当于3%Na2O用量）的效率高1.3倍。在相同的木材重量损失下，水解热水提取物中的总单糖含量比水解绿色液体提取物中的总单糖含量高约两倍。硫酸盐浆得率随预浸提失重的增加而降低。来自绿色液体预提取的碎片的纸浆产率与来自原始碎片的大致相同，而来自热水预提取的碎片的纸浆产率在10%木材重量损失下低约4%。在预提取的木片的硫酸盐法制浆中添加0.1%AQ使纸浆总得率增加约1%。与原木片相比，绿色液预浸木片硫酸盐法制浆的有效碱用量减少了3%，热水预浸木片减少了1%。来自绿色液预提取的碎片的硫酸盐纸浆在10%木材重量损失下的纤维特性仅略低于相同卡伯值下的硫酸盐对照纸浆。从热水预提取的碎片中获得的纸浆的纤维强度（FS数）、长度（L数）和粘合能力（B数）对于作为硫酸盐对照纸浆的纤维特征的粘合能力分别降低约3%和约6%。从预提取芯片的纸浆的强度特性表现出类似的依赖性。与相同卡伯值的硫酸盐法对照浆相比，热水预浸木片的纸浆的抗张指数降低约12%，耐破指数降低约15%，撕裂指数降低约5.5%。
Mixed hardwood chips were pre-extracted with green liquor and hot water prior to kraft pulping. The hot water extraction rate was higher by a factor of 1.3 compared to extraction with green liquor solution corresponding to 3 % Na 2O charge on ODW. The total monosaccharides content in hydrolysed hot water extract was approximately twice higher than in hydrolysed green liquor extract at the same wood weight loss. The total kraft pulp yield decreased with increase of wood weight loss in pre-extraction. Pulp yield from green liquor pre-extracted chips was approximately the same as from original chips, while pulp yield from hot water pre-extracted chips at 10 % wood weight loss was by about 4 % lower. Addition of 0.1 % AQ in kraft pulping of pre-extracted chips increased total pulp yield by about 1%. Effective alkali charge in kraft pulping was reduced by 3 % in kraft pulping of green liquor pre-extracted chips, and by 1 % of hot water pre-extracted chips in comparison with original chips. The fibre characteristics of kraft pulps from green liquor pre-extracted chips at 10 % wood weight loss were only slightly lower as of kraft control pulps at the same kappa number. Fibre strength (FS number), length (L number) and bonding ability (B number) of pulps from hot water pre-extracted chips were lower by about 3 %, and by about 6 % respectively for bonding ability as fibre characteristics of kraft control pulps. Strength properties of pulps from pre-extracted chips showed similar dependencies. Tensile index of pulps from hot water pre-extracted chips decreased by about 12 %, burst index by about 15 % and tear index by about 5.5 % in comparison with kraft control pulps at a same kappa number.