绿竹高沸点醇-水预处理过程中木质素的快速测定及其溶出动力学模型的建立  

Fast determination and kinetic model simulation on the lignin dissolution from green bamboo pretreated by high boiling alcohol-water

作　　者：刘婧[1] 陈礼[1] 赵宇博[1] 尤金海 李润青[1] 陈礼辉[1] 黄六莲[1] 罗小林[1] LIU Jing CHEN Li ZHAO Yubo YOU Jinhai LI Runqing CHEN Lihui HUANG Liulian LUO Xiaolin(College of Materials Engineering , Fujian Agriculture and Forestry University , Fuzhou 350002, Chin)

机构地区：[1]福建农林大学材料工程学院,福州350002

出　　处：《中国科技论文》2017年第4期472-476,共5页China Sciencepaper

基　　金：高等学校博士学科点专项科研基金资助项目(20123515120018);福建省教育厅科技计划项目(JB13033;JA15181);福建省高校杰出青年科研人才培训计划项目(JA14098);福建省高校新世纪优秀人才计划项目(闽教科[2015]54);中国博士后科学基金资助项目(2015M571955);国家级大学生创新创业训练计划项目(201610389020);福建省自然科学基金资助项目(2014J05028)

摘　　要：针对测定预处理液中木质素含量的传统方法较为复杂、过程繁琐,以及木素动力学模型难以准确预测木质素溶出规律等问题,研究通过排除溶剂和碳水化合物降解产物的紫外干扰,尝试建立紫外光谱快速测定绿竹高沸点醇木质素浓度的简便方法,并基于理论动力学建立其溶出的修正模型。结果表明,选择325nm作为木质素的测定波长可排除其他物质干扰,通过朗伯-比尔定律可建立其浓度的测定方法。此外,假一级反应动力学模型预测木质素溶出率偏高;在一定条件范围内,将木质素"潜在的溶出度"参数引入模型,求得其活化能、指前因子和溶剂反应级数分别为105.0kJ/mol、7.5×10^(11) min^(-1)和0.66。将这些参数代入修正模型,最终发现,预测值和实验值之间相关系数的平方可高达98%,表明此模型可准确预测绿竹高沸点醇预处理过程中木质素的溶出率。For the complexity of traditional method used to measure lignin content in pretreatment liquor and the difficulty to accu-rately predict the law of lignin dissolution by lignin kinetic model, a fast and simple UV method was developed to measure the lig-nin concentration of green bamboo in high boiling point alcohol by eliminating the UV interference of solvent and carbohydrate degradation products. Moreover, a modified kinetic equation was obtained by using a theoretical kinetic model. It was found that the solvent and carbohydrate degradation almost have no absorbance at 325 nm. As a result, a quantification of lignin concentra-tion can be achieved based on Lambert-Beer＇s law. In addition, with Pseudo 1th order kinetic model, the predictions are clearly higher than those of the experimental values. , By introducing ＂potential dissolution degree （ JL）＂ into the kinetic model within a certain range of conditions, the activation energy, frequency factor and reaction order of solvent were fitted as 105. 0 kj/mol, 7. 5 X1011 min-1 and 0. 66, and the new predictions were obtained. It was showed that the square of the correlation coefficient be-tween the new model predicted and experimental value was 98%, indicating the validity of modified kinetic model.

关 键 词：林产化学加工工程 水解工艺 预处理 紫外光谱 木质素 反应动力学 潜在溶出度 

分 类 号：TQ353.1[化学工程]