超声波协同作用对纤维素选择性酸水解的影响
首发时间:2014-08-29
摘要:利用超声波协同金属离子催化纤维素酸水解,探讨超声波协同对酸水解选择性的促进作用。通过正交实验L9(34)优化实验方案,以酸浓、金属Fe3+用量、水解时间和水解温度作为实验变量,研究超声协同作用对水解纤维素产品性能的影响。通过激光粒度分析仪、X射线衍射仪(XRD)、扫描电镜(SEM)、傅里叶红外光谱(FT-IR)和热重分析(TG)对水解纤维素纤维长度、晶型结构、化学组分及形态特征变化进行了表征比较。结果表明:当FeCl3浓度为0.3mol/L,HCl浓度2.5mol/L,温度80℃,反应时间50min时,超声协同作用下的水解纤维素结晶度为79.58%,与未处理试样相比增加了9.89%,水解纤维素平均长度由47μm降为29μm,纤维素化学结构和晶型均未发生改变。
关键词: 林产化学加工工程 选择性酸水解 超声波 纤维素 微晶纤维素
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The Influence of Ultrasonic Synergy on Selective Acid Hydrolysis of Cellulose
Abstract:Ultrasonic assisted with metal ion enhanced acid hydrolysis selectivity of cellulose were discussed. The thesis mainly explored the influence of the property of hydrocellulose from selective acid hydrolysis, as well as acid concentration, the dosage of metal ion, the temperature and duration of acid hydrolysis which is based on the orthogonal test L9(34). The properties of hydrocellulose untreated and treated are also compared by using Laser Particle Size Analyzer, XRD, SEM, FT-IR and TG. The optimal conditions of ultrasonic synergistic for acid hydrolysis selectivity of cellulose were 2.5mol/L acid concentration, 0.3mol/L metal ion at 80℃ for 50min, which resulting in an increased crystallinity of 9.89%, compared with the untreated hydrocellulose (69.69%), and the average fines length decreased from 47μm to 29μm. The crystalline structure and chemical structure were not transformed in the process of ultrasonic synergy.
Keywords: Chemical processing of forest products Selective acid hydrolysis Ultrasonication Cellulose Microcrystalline cellulose
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No.4607341997320140****
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