杨木水热预处理过程中水解反应动力学研究  

Hydrolysis Kinetics of Poplar During Thermal Hydrolysis

作　　者：吴彦 田中建[1,2,3] 陈嘉川 张凤山[2] 房桂干[3] 吉兴香[1] WU Yan;TIAN Zhongjian;CHEN Jiachuan;ZHANG Fengshan;FANG Guigan;JI Xingxiang(State Key Laboratory of Biobased Material and Green Papermaking,Qilu University of Technology(Shandong Academy of Sciences),Jinan 250353,China;Huatai Group,Dongying 257335,China;Institute of Chemical Industry of Forest Products,CAF,Nanjing 210042,China)

机构地区：[1]齐鲁工业大学(山东省科学院)生物基材料与绿色造纸国家重点实验室,山东济南250353 [2]华泰集团,山东东营257335 [3]中国林业科学研究院林产化学工业研究所,江苏南京210042

出　　处：《林产化学与工业》2022年第1期21-28,共8页Chemistry and Industry of Forest Products

基　　金：国家自然科学基金资助项目(31870566);山东省泰山学者工程项目(无编号)。

摘　　要：探讨了预处理温度和预处理时间对杨木水热预处理液中各组分含量的影响,同时采用改良的Saeman双相动力学模型建立了预处理液中木糖和葡萄糖的反应动力学方程,通过非线性拟合确定了不同条件下木糖和葡萄糖生成及分解的反应速率常数,由阿伦尼乌斯公式线性拟合得出木质纤维原料水解反应活化能。杨木预处理过程中木聚糖易降解部分活化能(E_(f))为78.35 kJ/mol,难降解部分活化能(E_(s))为88.97 kJ/mol,木糖分解的活化能为80.17 kJ/mol;葡聚糖降解活化能(48.06 kJ/mol)低于葡萄糖分解活化能(90.18 kJ/mol)。研究结果表明:葡萄糖比木糖更加稳定,水热预处理温和的处理条件可实现溶解半纤维素的同时减少纤维素和单糖的降解。The effects of pretreatment temperature and time on the content of the hydrolysate of poplar during thermal hydrolysis were investigated.The reaction kinetic models of xylose and glucose in the hydrolysis solution were established by using the modified Saeman biphasic kinetic model.The reaction rate constants of monosaccharides generation and degradation under different conditions were determined by nonlinear fitting curve.The activation energy of lignocellulosic hydrolysis reaction was obtained by linear fitting of Arrhenius formula.The results showed that xylan was divided into an easy-to-hydrolyse fraction and a difficult-to-hydrolyse fraction during the pretreatment of poplar.The activation energies of easy-to-hydrolyse(E_(f))and difficult-to-hydrolyse(E_(s))xylan were 78.35 kJ/mol and 88.97 kJ/mol,respectively.The activation energy of xylose degradation(E_(2))was 80.17 kJ/mol.Furthermore,the activation energy of glucan degradation(E_(3)=48.06 kJ/mol)was significantly lower than that of glucose degradation(E_(4)=90.18 kJ/mol).These results indicated that glucose was more stable than xylose,and the mild treatment conditions of hydrothermal pretreatment could realize the dissolution of hemicellulose accompanied by reducing the degradation of cellulose and monosaccharide.

关 键 词：杨木 水热预处理 双相动力学模型 

分 类 号：TQ35[化学工程] TS713[轻工技术与工程—制浆造纸工程]