酸枣核壳糠醛渣微晶纤维素的制备及其性能研究

摘要

UsingZizyphus jujube core-shell furfural residue as raw material, with the method of nitric acid- ethanol to extract cellulose, then microcrystalline cellulose was prepared with dilute hydrochloric acid hydrolysis of cellulose. On the basis of single factor experiment, using orthogonal test method to study the effect of hydrochloric acid concentration (A), solid-liquid ratio (B), hydrolysis temperature (C), hydrolysis time (D) on the yield of microcrystalline cellulose, according to the results of the optimum process, the best conditions for preparation of microcrystalline cellulose was 7% hydrochloric acid concentration, solid-liquid ratio 1∶10, hydrolysis temperature 70℃, hydrolysis time 2.5 h. Under the condition of the preparation of microcrystalline cellulose polymerization degree was 266.07, crystallinity was 76.49%, the yield was 89.21%, the properties of the product was good, process conditions were stable. This study provided a new way for comprehensive utilization of Zizyphus jujube resources.%以酸枣核壳糠醛渣为原料，利用硝酸―乙醇法提取纤维素，用稀盐酸水解纤维素制备微晶纤维素。在单因素实验的基础上采用正交试验法研究盐酸浓度（A）、料液比（B）、水解温度（C）、水解时间（D）对微晶纤维素得率的影响。结果显示，制备酸枣核壳糠醛渣微晶纤维素的最佳工艺条件为：盐酸浓度5%，料液比1∶10，水解温度100℃，水解时间2.5 h，在该条件下制备的微晶纤维素聚合度为266.07，结晶度为76.49%，得率为89.21%，产品性能优良，工艺条件稳定。本研究为酸枣资源的综合加工利用提供了一条新的途径。