Unpolluted fractionation of wheat straw by steam explosion and ethanol extraction

半纤维素 化学 木质素 蒸汽爆炸 木糖 乙醇沉淀 分馏 萃取(化学) 色谱法 纤维素 稻草 乙醇 单糖 热水抽汽 气相色谱法 核化学 有机化学 发酵 制浆造纸工业 无机化学 工程类
作者
Hongzhang Chen,Liying Liu
出处
期刊:Bioresource Technology [Elsevier BV]
卷期号:98 (3): 666-676 被引量:279
标识
DOI:10.1016/j.biortech.2006.02.029
摘要

An unpolluted process of wheat straw fractionation by steam explosion coupled with ethanol extraction was studied. The wheat straw was steam exploded for 4.5 min with moisture of 34.01%, a pressure of 1.5 MPa without acid or alkali. Hemicellulose sugars were recovered by water countercurrent extraction and decolored with chelating ion exchange resin D412. The gas chromatography (GC) and high-performance liquid chromatography (HPLC) analysis results indicated that there were organic acids in the hemicellulose sugars and the ratio of monosaccharides to oligosaccharides was 1:9 and the main component, xylose, was 85.9% in content. The total recovery rate of hemicellulose was 80%. Water washed materials were subsequently extracted with ethanol. The optimum extraction conditions in this work were 40% ethanol, fiber/liquor ratio 1:50 (w/v), severity log(R) = 3.657 (180 °C for 20 min), 0.1% NaOH. The lignin yield was 75% by acid precipitation and 85% ethanol solvent was recovered. The lignin was purified using Björkman method. Infrared spectrometry (IR) results indicated that the lignin belonged to GSH (guaiacyl (G) syringyl (S) and p-hydroxyphenyl (H)) lignin and its purity rate reached 85.3%. The cellulose recovery rate was 94% and the results of electron spectroscopy for chemical analysis (ESCA) and infrared spectrometry (IR) showed that hemicellulose and lignin content decreased after steam explosion and ethanol extraction.
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