纤维素高值化利用制备微晶纤维素  

High Value-added Utilization of Cellulose: Microcrystalline Cellulose Preparation

作　　者：张向荣[1,2] 张美云[1,2] 李金宝[1,2] 贺行[1,2] 

机构地区：[1]陕西科技大学轻工与能源学院 [2]陕西科技大学教育部轻化工助剂化学与技术重点实验室,陕西西安710021

出　　处：《中国造纸》2014年第5期24-28,共5页China Pulp & Paper

基　　金：教育部高校博士点专项基金(20126125130001);陕西科技大学博士启动基金(BJ13-02)资助;陕西科技大学创新基金资助项

摘　　要：以溶解浆为原料,通过Fe3＋作为催化剂酸水解、分离、纯化制备微晶纤维素（MCC）粗产品。确定最优的稀酸水解浓度和Fe3＋浓度,同时对水解残液成分进行初步分析。最终水解条件为,水解温度80℃,Fe3＋浓度0.3 mol/L,水解时间60 min,HCl浓度2.0 mol/L。对制备的MCC分析与表征结果表明,MCC主要成分为纤维素,其晶型结构仍为纤维素Ⅰ型,结晶度为73.0%,与原料相比增加了18.2个百分点,聚合度下降至100左右;所得的MCC质均长度集中分布在200～400μm之间;水解残液中还原糖得率为1.56%。Application of metal Fe3 ＋catalytic acid hydrolysis,separation and purification to prepare crude microcrystalline cellulose from dissolving pulp was introduced. The optimal dilute acid hydrolysis concentration and Fe3 ＋concentration were determined,and a preliminary analysis was carried out on the ingredients of hydrolysis residual liquid. The optimal hydrolysis parameters were： hydrolysis temperature 80℃, Fe3 ＋concentration 0. 3 mol / L,hydrolysis time 60 min,and hydrochloric acid concentration 2. 0 mol / L. The results showed that the main composition of MCC was cellulose with crystalline structure ofⅠtype,the crystallinity was 73. 0%,which increased by 18. 2 percentage points compared with raw material 54. 8%,and the degree of polymerization reduced to around 100; and the weighted mean length of MCC distribution was between 200 ～ 400 μm; the yield of reducing sugar in the hydrolysis residual liquid was 1. 56%.

关 键 词：微晶纤维素 FE3+ 选择性酸水解 还原糖 

分 类 号：TQ352.7[化学工程]