Fractionation of main components in wind-fallen and thinning woods by continuous extraction with solvents at atmospheric pressure for utilization of poor-grade woods

为了利用有价值的产品，对间伐、风暴倒塌和短轮伐期获得的劣质木材进行了有机溶剂连续提取系统的制浆。木材来自大多数硬木，如桦树、杨树和山毛榉，以及云杉和云杉(Abies sachalinensis Master.)在回流温度下，以含少量硫酸或盐酸的醋酸溶液为溶剂制浆体系，可将针叶木浆定量分离为ACoH浆、半纤维素和木质素。然而，通过这种制浆过程，从落叶松和杉木(Cryptomeria ja onica D.Don)中疏伐木材会产生大量残留木素的PHA纸浆。落叶松和杉木可以通过一种新的多元醇法制浆，无论是在回流温度下使用硫酸还是在更高温度下使用冰醋酸。以木质多糖为原料，可制得制浆溶剂用的醋酸和多元醇。ACOH浆具有稳定的造纸性能。从废液中回收的以糖形式存在的水溶性物质主要由木糖、甘露糖等单糖组成。这些糖似乎被用作减肥甜味剂、药物和化学品。ACoH木质素具有热熔化的特点，可以用简单、经济的方法将其转化为高质量的碳纤维和纤维状活性碳。PHA纸浆兼有纸级和溶解纸浆的性能。从废液中大量回收木质素。与制浆溶剂一起获得的半纤维素可以多次用于制浆，而不需要回收和转化。

Poor-grade woods obtained from thinning, storm-fallen-down and short-rotation trees were subjected to pulpings by continuous extraction systmes with organic solvents in order to utilize valuable products. The woods from most of hardwood such as birch, poplar and beech, and from spruce and todomatsu (Abies sachalinensis Masters.) as softwood were possible to be separated into AcOH pulp, hemicellulose and lignin quantitatively by a solvent pulping system with aqueous acetic acid containing a small amount of sulfuric acid or hydrochloric acid at reflux temperatures. However, thinning woods from larch and sugi (Cryptomeria japonica D.Don) yielded PHA pulps with large amounts of residual lignin by this pulping process. The larch and sugi woods were possible to be pulped by a novel polyhydric alcohol process either with sulfuric acid at reflux temperature or with acetic acid at higher temperatures. Acetic acid and polyhydric alcohols for pulping solvents may be prepared from wood polysaccharides.AcOH pulps had satsfactory properties for paper-making. The water solubles recovered as sugars from the waste liquor consisted mainly of monosaccharides such as xylose, mannose and so forth. The sugars appear to be utilized as diet sweeteners, medicines and chemicals. AcOH lignin could be converted to carbon fibers and fibrous active carbon with good quality by use of simple and economical methods because it has the characteristic hot-melting. PHA pulps had the properties for paper-grade and dissolving pulps. Lignin was recovered in quantity from the waste liquor. Hemicelluolse obtained together with the pulping solvent may be used several times for pulpings without recovery and conversion.