Species Effects on Wood-Liquefaction in Polyhydric Alcohols
Species Effects on Wood-Liquefaction in Polyhydric Alcohols
复制标题
DOI：
10.1515/hf.1999.102
复制
发表时间：
1999-11
期刊：
影响因子：
--
通讯作者：
Y. Kurimoto;S. Doi;Y. Tamura
中科院分区：
文献类型：
--
作者：
Y. Kurimoto;S. Doi;Y. Tamura
使用聚乙二醇（PEG）或含甘油的PEG溶剂体系作为液化试剂，在限定的反应条件下液化四种软木和三种硬木物种：木材/液化试剂/硫酸= 3.00/9.00/0.27克，150 ℃。测定残留物百分比和羟基值作为溶液多元醇值的估计值。即使在最佳反应条件下，PEG体系也产生10-30%的残余材料，因为低-OH基团含量导致液化木材（LW）的再缩合。在延长的反应时间（150分钟）上，羟基数从210线性降低到100 mg KOH/g。另一方面，在PEG体系中加入10%甘油，无论测试的木材种类如何，都会产生少量的未液化残留物（约3%）和稳定的羟基值。在反应时间为60 min的情况下，平均残留值为5.8%，相应的平均羟基值为216.1 mg KOH/g。该系统被认为适用于各种木材的液化。
Summary Four softwood and three hardwood species were liquefied using polyethylene glycol (PEG) or glycerol-containing PEG solvent systems as liquefaction reagents under defined reaction conditions: wood / liquefaction reagent / sulfuric acid = 3.00/9.00/0.27 gram, at 150 °C. The percentage residues and hydroxyl numbers were determined as an estimate of polyol value of the solution. The PEG system yielded 10–30% residual materials even under the best reaction conditions since low -OH group content resulted to re-condensation of liquefied wood (LW). The hydroxyl numbers linearly decreased from 210 to 100 mg KOH/g on extended (150 min) reaction time. On the other hand, addition of 10% glycerol to the PEG system resulted in small amount of unliquefied residues (~ 3%) and a stable hydroxyl number, regardless of the wood species tested. In case of 60 min reaction time, the mean residue value was 5.8% and a corresponding mean hydroxyl number of 216.1 mg KOH/g was obtained. This system is deemed suitable for liquefaction of a wide variety of wood species.