用酶水解间接控制纤维板和刨花板产生的木颗粒的蒸汽爆炸

IF 0.9 Q4 CHEMISTRY, MULTIDISCIPLINARY Acta Chimica Slovaca Pub Date : 2019-10-01 DOI:10.2478/acs-2019-0026
A. Pažitný
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引用次数: 4

摘要

摘要研究了以木质纤维素为原料,采用蒸汽爆破和酶水解间接控制预处理木质纤维素颗粒的方法。将树枝团预处理模型应用于软木再生纤维板和刨花板。它们的结构和化学成分部分预先决定了这些木质纤维素材料,这些材料由云杉和冷杉颗粒的混合物组成,也用于生物乙醇生产。根据所有实验制备的水解产物中总单糖(葡萄糖、木糖和阿拉伯糖)的浓度,确定了205°C的最佳蒸汽爆炸温度。这对应于生物质精细分解为具有良好的全纤维素可及性的木质纤维素结构的基本条件。从纤维板和主要由软木组成的颗粒板获得的颗粒在没有蒸汽爆炸预处理的情况下为商业酶活性提供了相对较低的纤维素可及性,而单糖浓度由于在高温下的烘焙而部分降低。对原始样品和每个蒸汽爆炸温度测定水解产物中单糖的浓度。基于蒸汽爆炸条件,研究了严重性因素的影响,以找到提高软木纤维素和半纤维素可及性的最佳预处理条件。确定的最佳严重性系数RO=4.09与205°C的最佳蒸汽爆炸温度和10分钟的停留时间相匹配。
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Steam explosion of wood particles from fibreboard and particle board with indirect control by enzymatic hydrolysis
Abstract Pretreatment of particles obtained from lignocellulosic materials by steam explosion with indirect control by enzymatic hydrolysis has been studied. The dendromass pretreatment model has been applied for recycled fibreboard and particle board based on softwood. Their structure and chemical composition partly predetermine these lignocellulosic materials consisting of a mixture of spruce and fir particles also for bioethanol production. Optimum steam explosion temperature of 205 °C was determined based on the concentration of total monosaccharides — glucose, xylose and arabinose, among all experimentally prepared hydrolysates. This corresponds to basic conditions for fine disintegration of biomass to lignocellulosic structure with good holocellulose accessibility. Particles obtained from fibreboard and particle board primarily consisting of softwood without steam explosion pretreatment provide relatively low cellulose accessibility for commercial enzymes activity while monosaccharides concentration is partly reduced because of torrefaction at high temperatures. The concentration of monosaccharides in hydrolysates was determined for original sample and each steam explosion temperature. Based on the steam explosion conditions, the effect of severity factors was investigated to find optimum pretreatment conditions to increase accessibility of softwood cellulose and hemicelluloses. The identified optimum severity factor RO = 4.09 matches the optimum steam explosion temperature of 205 °C and the residence time of 10 minutes.
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来源期刊
Acta Chimica Slovaca
Acta Chimica Slovaca CHEMISTRY, MULTIDISCIPLINARY-
自引率
12.50%
发文量
11
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