利用TG-FTIR研究造纸黑液碱木质素的热解机理

doi:10.3969/j.issn.1673-5854.2018.02.007

生物质化学工程 ›› 2018, Vol. 52 ›› Issue (2): 35-41.doi: 10.3969/j.issn.1673-5854.2018.02.007

利用TG-FTIR研究造纸黑液碱木质素的热解机理

谭扬¹, 马春富²

1. 中国科学院烟台海岸带研究所, 山东烟台 264003;
2. 烟台大学, 山东烟台 264003

收稿日期:2017-03-15 出版日期:2018-03-30 发布日期:2018-04-03
作者简介:谭扬(1980-),女,山东烟台人,工程师,博士,主要从事生物质热解方面的研究;E-mail:ytan@yic.ac.cn。
基金资助:
中科院仪器设备功能开发技术创新项目（2017g0061）

Mechanism Study of Black Liquor Alkali Lignin Pyrolysis by Using TG-FTIR

TAN Yang¹, MA Chunfu²

1. Yantai Institute of Coastal Zone Research Chinese Academy of Sciences, Yantai 264003, China;
2. Yantai University, Yantai 264003, China

Received:2017-03-15 Online:2018-03-30 Published:2018-04-03

摘要/Abstract

摘要： 采用热重-傅里叶红外光谱（TG-FTIR）联用的分析方法对造纸黑液碱木质素的热解失重特性和产物生成特性进行了研究。结果表明：碱木质素热解失重过程可分为3个阶段，其中200~500℃是碱木质素主要的热解挥发阶段，反应符合一级反应动力学模型，利用Coats-Redfern动力学模型计算得出不同升温速率下热解主反应的表观活化能为39.3~43.1 kJ/mol。FTIR的实时分析结果表明：碱木质素热解的气态产物主要有H₂O、CO₂、CO、CH₄、甲醇、酚类和N₂O；产物中的CH₄、甲醇、酚类和N₂O主要在300~500℃区间内释放，随着热解温度的升高，这些气态产物在420℃附近集中释放，且产量达到最大。

关键词: 碱木质素, 热解, 动力学, 热重-红外联用仪

Abstract: The TG-FTIR technique was used to investigate the pyrolysis characteristics of black liquor alkali lignin as well as its gas products. The results revealed that the pyrolysis process of alkali lignin comprised three stages and it mainly occurred at the temperature range from 200 to 500℃. The pyrolysis reaction of alkali lignin could be described by first-order reaction kinetics model and the apparent activation energies calculated by Coats-Redfern model were from 39.3 to 43.1 kJ/mol at different heating rates. The gas products of pyrolysis analyzed by FTIR contained H₂O, CO₂, CO, CH₄, methanol, phenols and N₂O, in which CH₄, methanol, phenols and N₂O were mainly released at the temperature range from 300 to 500℃ and the maximal yields of these gas products were obtained at about 420℃.

Key words: alkali lignin, pyrolysis, kinetics, TG-FTIR

中图分类号:

TS71+2
TQ35

谭扬, 马春富. 利用TG-FTIR研究造纸黑液碱木质素的热解机理[J]. 生物质化学工程, 2018, 52(2): 35-41.

TAN Yang, MA Chunfu. Mechanism Study of Black Liquor Alkali Lignin Pyrolysis by Using TG-FTIR[J]. bce, 2018, 52(2): 35-41.

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利用TG-FTIR研究造纸黑液碱木质素的热解机理

Mechanism Study of Black Liquor Alkali Lignin Pyrolysis by Using TG-FTIR

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