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首页> 外文期刊>Nordic Pulp & Paper Research Journal >Pressurized hot water flow-through extraction of birch sawdust - Effects of sawdust density and sawdust size
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Pressurized hot water flow-through extraction of birch sawdust - Effects of sawdust density and sawdust size

机译：桦木锯末的加压热水流过提取-锯末浓度和锯末尺寸的影响

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摘要

Birch sawdust was extracted using a pressurized hot water (PHW) flow-through system, with the aim of recovering polymeric, water-soluble xylans. The extraction temperature was 180℃for 60 min with a constant water flow through the extraction vessel. The sawdust was packed in the extraction vessel with densities in the range of 0.2 - 0.7 kg/l. Higher packing densities of birch sawdust gave higher concentration of extract. Higher sawdust densities had also lower liquid to wood ratios during extractions. The highest extract concentration peak was achieved with 0.5 kg/l density of birch sawdust. At the beginning of the higher density extractions, more xylans and lignin were extracted than lower densities. Birch sawdust with three different particle sizes was also extracted under the same conditions. The amounts of extracted xylans were higher for the smallest particle size. Higher sawdust densities decreased the difference in the extraction yield between different particle sizes of sawdust.
机译：桦木锯末是使用加压热水（PHW）流通系统提取的，目的是回收聚合的水溶性木聚糖。萃取温度为180℃，持续60分钟，同时恒定的水流通过萃取容器。将木屑以0.2-0.7kg / l的密度包装在提取容器中。桦木屑的堆积密度越高，提取物的浓度越高。较高的木屑密度在提取过程中的液木比也较低。桦木锯末密度为0.5 kg / l时，提取物浓度最高。在开始较高密度的提取开始时，提取的木聚糖和木质素要比较低密度的提取更多。在相同条件下还提取了三种不同粒径的桦木锯末。对于最小粒度，木聚糖的提取量较高。较高的木屑密度降低了不同粒径的木屑之间提取率的差异。

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