乙醇溶剂中浓H_2SO_4酯化蔗渣木聚糖的合成研究  

Study on Bagasse Xylan Esterified by Concentrated Sulfuric Acid in the Ethanol Solvent

作　　者：李和平[1,2] 杨官威[1,2] 黄云燕 袁金伟[1,2] 胡杨 杨永哲 张垚[1,2] 

机构地区：[1]桂林理工大学化学与生物工程学院 [2]有色金属及材料加工新技术教育部重点实验室,广西桂林541004

出　　处：《徐州工程学院学报（自然科学版）》2013年第2期7-13,共7页Journal of Xuzhou Institute of Technology(Natural Sciences Edition)

基　　金：桂林市科学研究与技术开发项目(20110105-3);广西自然科学基金项目(桂科自0832258)

摘　　要：以蔗渣木聚糖为主要原料,浓硫酸为酯化剂,乙醇为溶剂,合成了蔗渣木聚糖硫酸酯.用氯化钡-明胶分光光度法对蔗渣木聚糖硫酸酯的取代度进行了测定.考察了诸因素对取代度的影响,确定了反应的较佳条件.结果表明,木聚糖的质量与浓硫酸的体积比为0.075g/mL,当乙醇质量分数为80%,浓硫酸的浓度为4mol/L,反应时间为4.5h时,反应温度为0℃,木聚糖硫酸酯的取代度为1.39.采用紫外光谱、红外光谱和扫描电镜对产物的结构进行了表征.Bagasse xylan sulfate was synthesized in the ethanol solution by using bagasse xylan as raw materials and the concentrated sulfuric acid as esterifying agent. The degree of substitution （DS） of bagasse xylan sulfate was determined by the method of barium chloride-gelatin turbidimetric. The influence of vari-ous reaction conditions on the DS was investigated and the optimal conditions were determined. The results show that the DS of bagasse xylan sulfate averaged at 1.39 under the conditions as follows： ratio of ba-gasse xylan to concentrated sulfuric acid 0.75 g to 10 mL, the mass fraction of ethanol 80%, concentration of the concentrated sulfuric acid 4 mool/L, reaction time 4.5 h and reaction temperature 0 ℃. The structure of bagasse xylan sulfate was characterized by ultraviolet spectroscopy, FTIR and SEM.

关 键 词：蔗渣木聚糖硫酸酯 蔗渣木聚糖 酯化 取代度 

分 类 号：TQ352[化学工程]