Hydrolysis of Japanese beech by batch and semi-flow water under subcritical temperatures and pressures
Hydrolysis of Japanese beech by batch and semi-flow water under subcritical temperatures and pressures
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DOI：
10.1016/j.biombioe.2010.02.015
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发表时间：
2010-08-01
影响因子：
6
通讯作者：
Saka, Shiro
中科院分区：
文献类型：
--
作者：
Lu, Xin;Saka, Shiro
利用热压缩水对木质纤维生物质进行水解，为从半纤维素和纤维素中获得糖类以用于生物燃料生产和糖类生产创造了机会。本文研究了间歇和半流动热压缩水对山毛榉(Fagus Crenata)的水解作用。对处理后残渣的单糖、低聚糖和分解产物进行了测定，并对残渣的结构变化和化学成分进行了分析。结果表明，间歇式和半流动式热压缩水处理的总糖产量均随温度升高而增加。半流动热压缩水在250℃时总糖产量最高，高于间歇热压缩水在190℃时相应的最大总糖产量。间歇式热压缩水处理温度高于230℃，半流动热压缩水处理温度高达270℃时，半纤维素产生的低聚木糖生成。另一方面，用间歇热压缩水处理时，从170℃开始产生纤维素低聚糖，而用半流动热压缩水处理时，在210℃以下不能产生纤维低聚糖。综上所述，间歇和半流动热压缩水在不同的最适温度下均可用于半纤维素的水解，但半流动热压缩水对纤维素的降解效果优于间歇热压缩水。(C)2010爱思唯尔有限公司。保留所有权利。
Hydrolysis of lignocellulosic biomass by hot-compressed water is creating an opportunity to obtain saccharides from both hemicelluloses and cellulose for biofuel production as well as saccharides production. In this work, the hydrolysis of Japanese beech (Fagus crenata) by batch and semi-flow hot-compressed water was investigated. After the treatments, the monosaccharides, oligosaccharides and decomposition products in water-soluble portion were determined, while the structural variation as well as chemical composition of residue was analyzed. The results demonstrated that the production of total saccharides increased with the temperature for both batch and semi-flow hot-compressed water treatments. The maximum yield of total saccharides was achieved at 250 degrees C when treated by semi-flow hot-compressed water, which was higher than the corresponding maximum production of saccharides obtained at 190 degrees C when treated by batch hot-compressed water. The xyloo-ligosaccharides which came from hemicelluloses were produced until the temperature was higher than 230 degrees C when treated by batch hot-compressed water, while they were produced until 270 degrees C when treated by semi-flow hot-compressed water. On the other hand, the cellooligosaccharides which came from cellulose began to produce from 170 degrees C when treated by batch hot-compressed water, while they were not produced below 210 degrees C when treated by semi-flow hot-compressed water. In conclusion, both batch and semi-flow hot-compressed water can be used to hydrolyze hemicelluloses though at different optimal temperature, while semi-flow hot-compressed water was better than batch hot-compressed water for hydrolysis of cellulose. (C) 2010 Elsevier Ltd. All rights reserved.