Effects of water in water/phenol mixtures on liquefaction of Japanese beech as treated under subcritical conditions
Effects of water in water/phenol mixtures on liquefaction of Japanese beech as treated under subcritical conditions
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DOI：
10.1515/hf-2012-0050
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发表时间：
2013-04
期刊：
影响因子：
--
通讯作者：
G. Mishra;S. Saka
中科院分区：
文献类型：
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作者：
G. Mishra;S. Saka
摘要在间歇式反应器中，以水为溶剂，在无催化剂的条件下，对日本山毛榉进行了亚临界苯酚液化。在不同处理时间的条件下，研究了水/酚比的影响。可溶于苯酚/水的级分以及不溶性残留物进行了表征。液化动力学研究假设的有效性的一级反应速率定律。酚化程度随着处理次数和苯酚/水溶剂中水含量的增加而增加。在270°C、3.1 MPa压力、水/苯酚比为25：75的条件下处理10 min，液化效果最好。发现来源于纤维素和半纤维素的各种寡糖被水解并溶解在水溶性部分中。
Abstract Japanese beech (Fagus crenata) has been liquefied by water-added subcritical phenol without a catalyst in a batch-type reaction vessel. The effect of water/phenol ratio was studied under conditions of various treatment times. The fractions soluble in phenol/water as well as the insoluble residues were characterized. Liquefaction kinetics was investigated assuming the validity of the first-order reaction rate law. The degree of phenolation was increased with increasing treatment times and water content in phenol/water solvent. Treatment at 270°C under 3.1 MPa pressure for 10 min with a water/phenol ratio of 25:75 gave the best liquefaction result. Various oligosaccharides derived from cellulose and hemicelluloses were found to be hydrolyzed and solubilized in the water-soluble portion.