Autohydrolysis pretreatment of mixed hardwoods to extract value prior to combustion
Autohydrolysis pretreatment of mixed hardwoods to extract value prior to combustion
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DOI：
10.15376/biores.6.4.4856-4870
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发表时间：
2011-10
期刊：
影响因子：
1.5
通讯作者：
Y. Pu;Trevor Treasure;Ronalds Gonzalez;R. Venditti;H. Jameel
中科院分区：
文献类型：
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作者：
Y. Pu;Trevor Treasure;Ronalds Gonzalez;R. Venditti;H. Jameel
通过自动水解的生物质预处理使用热水从木材中提取可溶性组分，然后将木质残余物转化为纸、木制品或燃料等。混合硬木碎片在150、160、170和180 º C的热水中自动水解1和2小时。研究了可发酵糖产率和残余固体的热值之间的权衡，该方法将被称为"燃烧前的值"。用稀硫酸处理提取液以将糖低聚物分解成可发酵单体。围绕自动水解进行物料平衡，以评估温度和停留时间对糖产量和残余固体热值的作用。测定了提取液的组成（糖和副产物）。随着自动水解温度的升高，物料平衡变得不那么精确，推测是由于形成了更多的挥发性副产物，这些副产物未被定量。在较高的温度和较长的停留时间下，通过热水提取过程从木材中提取更多的半纤维素，但也观察到更大程度的糖降解。热水浸提后的固体残渣的热值高于原始木材。提取后残留固体的总能量含量为进料原始能量含量的74 - 95%。
Biomass pretreatment by autohydrolysis uses hot-water to extract soluble components from wood prior to converting the woody residuals into paper, wood products, or fuel, etc. Mixed hardwood chips were autohydrolyzed in hot-water at 150, 160, 170, and 180 ºC, for 1 and 2 h. The tradeoff between fermentable sugar yield and caloric value of the residual solids was studied for a process that will be referred to as “value prior to combustion”. The extracted liquid was treated with dilute sulfuric acid to break down sugar oligomers into fermentable monomers. Material balances were performed around autohydrolysis to evaluate the role of temperature and residence time on sugar production and residual solid heating value. The composition (sugars and byproducts) of the extracted liquid was determined. As the autohydrolysis temperature increased, the material balance became less precise, presumably due to more volatile byproducts being formed that were not quantified. More hemicelluloses were extracted from the wood by the hot water extraction process under higher temperature and longer residence time, but a greater degree of sugar degradation was also observed. After hot-water extraction the heating value of the solid residues was higher than the original wood. The total energy content of the residual solid after extraction ranged from 74 to 95% of the original energy content of the feed.