不同催化剂对纤维素酸水解制备微晶纤维素的影响  

Effects of Catalysts on Preparation of Microcrystalline Cellulose from Cellulose Acid Hydrolysis

作　　者：李金宝[1,2] 贺行[1] 张美云[1,2] 张向荣[1] 

机构地区：[1]陕西科技大学轻工与能源学院,陕西省造纸技术及特种纸品开发重点实验室,西安710021 [2]华南理工大学制浆造纸工程国家重点实验室,广州510640

出　　处：《纸和造纸》2013年第12期21-24,共4页Paper and Paper Making

基　　金：教育部高校博士点专项基金项目(20126125130001);制浆造纸工程国家重点实验室开放基金项目(201215);陕西科技大学博士启动基金(BJ13-02);陕西科技大学创新基金资助项目

摘　　要：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。The hydrolysis differences of HC1 and H2SO4 for cellulose aggregated structure and the effect of catalysts on cellulose amorphous region selective hydrolysis in the process of preparation of microcrystalline cellulose were investigated. Thus, the fiber form, crystallization characteristics, crystal face indices and the microstructure of hydrocellulose were analyzed and characterized in this study. Fiber form analysis showed that HCl could improve the hydrolysis for cellulose. When H＋ concentration increased to 2.0 mol·L^-1, the mean fibers length reduced from 656 btm to 300 μm, the kink rate and curl index fell to 9.85% and 11.22% from 46.45% and 15.53% respectively. XRD analysis indicated that the crystaUinity of hydrocellulose increased from 64.53% to 76.10% and 69.61% catalyzed by HC1 and H2SO4 respectively, the HC1 was more advantageous to improve the selective hydrolysis for cellulose amorphous region.

关 键 词：纤维素 微晶纤维素 聚集态结构 酸水解 结晶度 

分 类 号：TS71[轻工技术与工程—制浆造纸工程]