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以HCl和H2SO4为催化剂分别对纤维素进行酸水解,通过对水解纤维素的纤维形态、结晶性能、晶面指数和微观形貌进行了分析和表征,研究制备微晶纤维素过程中纤维素聚集态结构的水解差异性以及催化剂种类对纤维素无定形区选择性水解的影响。研究结果表明:HCl对纤维素的水解促进作用明显,H+浓度增加至2.0 mol·L-1时,纤维平均长度由656μm降低至300μm,扭结率由46.45%下降至9.85%,卷曲指数由15.53%下降至11.22%;HCl和H2SO4催化纤维素酸水解前后,产物的结晶度分别由64.53%提升至76.10%和69.61%,HCl更有利于促进纤维素无定形区的选择性水解。
Hydrolysis of cellulose was carried out by using HCl and H2SO4 as catalysts. The morphology, crystallinity, crystallinity index and morphology of hydrolyzed cellulose were analyzed and characterized to study the effect of cellulose aggregation Hydrolytic difference of state structure and the effect of catalyst type on selective hydrolysis of cellulose amorphous area. The results showed that HCl promoted the hydrolysis of cellulose obviously. When the H + concentration was increased to 2.0 mol·L-1, the average fiber length decreased from 656μm to 300μm, the kink rate decreased from 46.45% to 9.85%, and the crimp index increased from 15.53% To 11.22% respectively. The crystallinity of the products increased from 64.53% to 76.10% and 69.61%, respectively, before HCl and H2SO4 catalyzed the hydrolysis of cellulose. Hydrolysis of HCl was more beneficial to the selective hydrolysis of cellulose in the amorphous region.