典型中药渣的热解特性研究  

Study on pyrolysis characteristics of typical Chinese medicine residues

作　　者：李俊 陈夏 李蕴钰 张国峰 郭光豪 米铁[1] 辛善志[1] LI Jun;CHEN Xia;LI Yunyu;ZHANG Guofeng;GUO Guanghao;MI Tie;XIN Shanzhi(Hubei Key Laboratory of Industrial Fume and Dust Pollution Control,Jianghan University,Wuhan Hubei 430056)

机构地区：[1]江汉大学工业烟尘污染控制湖北省重点实验室,湖北武汉430056

出　　处：《环境污染与防治》2022年第12期1601-1606,共6页Environmental Pollution & Control

基　　金：湖北省高等学校优秀中青年科技创新团队计划项目(No.T201420)。

摘　　要：采用热重分析仪研究了4种典型中药渣组分的热解特性,并根据Coats-Redfern积分方法计算得到不同中药渣组分的热解动力学参数。结果表明:4种中药渣热解的主要热失重温度区间为200~400℃,其中当归的起始分解温度最低(203℃),连翘的起始分解温度最高(243℃),不同中药渣的热解特性因其主要化学组成不同存在差异性。随着升温速率的升高,中药渣组分的最大失重峰温度与最大失重速率均增大,起始分解温度与终止分解温度均向高温区移动。通过热解反应动力学分析,中药渣的热解过程主要符合二级动力学模型,主要热失重阶段的反应活化能为41.44~71.95 kJ/mol,二次碳化阶段的反应活化能为24.75~27.68 kJ/mol,4种中药渣的热稳定性从高到低依次为连翘、薄荷、决明子、当归。The pyrolysis characteristic of four typical Chinese medicine residues(CMRs)was investigated by using thermogravimetric analyzer.The kinetic parameters of CMRs pyrolysis were calculated according to the Coats-Redfern method.The results indicated that the main weight loss phase of different CMRs was in the range of 200-400℃.Among them,the initial decomposition temperature of Angelica sinensis was the lowest at 203℃,while that of Fructus forsythiae was the highest at 243℃.Different main chemical compositions of CMRs caused their different pyrolysis characteristics.The maximum weight loss peak temperature and weight loss rate of CMRs increased with the increase of the heating rate.Meanwhile,the initial decomposition and termination temperature moved to higher temperatures.The kinetic analysis indicated that the pyrolysis of CMRs could be described by second-order kinetic model.The activation energy of the different CMRs in main weight loss phase was ranged 41.44-71.95 kJ/mol,while for secondary carbide phase the activation energy was ranged 24.75-27.68 kJ/mol.The thermal stability of four CMRs followed the order of Fructus forsythiae>Peppermint>Cassia seed>Angelica sinensis.

关 键 词：中药渣 热重分析 热解特性 动力学 

分 类 号：X787[环境科学与工程—环境工程]