盐酸催化甘蔗渣水解制备木糖工艺及动力学研究  

Technical and Kinetic Study on Hydrolysis of Sugarcane Bagasse Catalyzed by Hydrochloric Acid to Prepare Xylose

作　　者：黄志钰 张荣立 王元春 牙冬梅 冯德伟 易立鹏 谢承孟 HUANG Zhi-yu;ZHANG Rong-li;WANG Yuan-chun;YA Dong-mei;FENG De-wei;YI Li-peng;XIE Cheng-meng(Guangxi Institute of Light Industry Science and Technology Company Limited,Nanning 530031,China)

机构地区：[1]广西轻工业科学技术研究院有限公司,广西南宁530031

出　　处：《纤维素科学与技术》2023年第2期19-27,共9页Journal of Cellulose Science and Technology

基　　金：广西重点研发计划项目(桂科AB20159045)。

摘　　要：在200L反应釜中,以盐酸为催化剂、水解液中木糖的浓度(w/V)和木糖占可溶性物质的百分含量(%)为指标,采用单因素法和正交试验法考察反应温度、盐酸浓度(w/w)、固液比对甘蔗渣水解效率的影响,获得了甘蔗渣水解制备木糖的最佳工艺条件,同时建立了盐酸催化甘蔗渣水解制备木糖的动力学模型,经过拟合计算得到木糖的生成反应表观活化能为46.03 kJ/mol,木糖降解反应的表观活化能34.58 kJ/mol,引入修正的反应速率常数表达式,对不同酸浓度下木糖质量浓度曲线进行拟合,得到木糖生成反应的修正指前因子为1.087×10^(5),木糖降解反应的修正指前因子为2.139×10^(2)。Sugarcane bagasse hydrolysis was conducted in 200 L reactor catalyzed by dilute hydrochloric acid,the mass concentration(w/V)of xylose and the percentage of xylose in soluble substance was used as the index.The effects of reaction temperature,acid concentration(w/w)and solid-liquid ratio on bagasse hydrolysis efficiency were investigated by methods of single-factor experiment and orthogonal experiment,respectively,and the kinetic model of xylose preparation from bagasse catalyzed by dilute hydrochloric acid was established.The activation energy of xylose formation reaction was 46.03 kJ/mol,while xylose degradation reaction was 34.58 kJ/mol.The modified reaction rate constant expression was introduced to fit xylose mass concentration change trend under different acid concentration.The pre-exponential factor of xylose formation reaction and xylose degradation reaction were calculated to be 1.087×10^(5) and 2.139×10^(2),respectively.

关 键 词：水解 木糖 催化 动力学 

分 类 号：TQ353.6[化学工程]