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本文针对木质纤维化学组成和结构特性,研究了木素对木质纤维化学组分、化学基团和结晶结构的影响,以及其中纤维素和半纤维素水解性能的影响。结果表明:木质纤维经碱处理脱除木素后,纤维氢键增强,结晶度由52.64%增至63.73%,使得晶区可反应表面积减少,表现在纤维水解性能方面是,最大水解率由75.4%增加至86.8%,己糖最大得率由17.79%降至6.07%,木糖最大得率由6.82%降至3.37%,5-羟甲基糠醛最大得率由12.7%降至8.48%,但到达己糖最大得率的时间由110s缩短至40s,水解液中酚、脂、酸等含有苯环的物质种类明显减少。
In this paper, according to the chemical composition and structural characteristics of lignocellulose, the effects of lignin on the chemical composition, chemical groups and crystal structure of lignocellulose, as well as the hydrolysis of cellulose and hemicellulose, were studied. The results showed that after the lignin was removed by alkali treatment, the fiber hydrogen bond increased and the crystallinity increased from 52.64% to 63.73%, which led to the decrease of the reaction surface area in the crystalline zone. The maximum hydrolytic rate was from 75.4 % To 86.8%, the maximum yield of hexoses dropped from 17.79% to 6.07%, the maximum yield of xylose dropped from 6.82% to 3.37%, and the maximum yield of 5-hydroxymethylfurfural decreased from 12.7% to 8.48% The time to reach the maximum yield of hexose shortened from 110s to 40s, the phenols, lipids and acids in the hydrolyzate obviously reduced the types of benzene ring containing substances.