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

作　　者：谭扬[1] 马春富 TAN Yang1, MA Chunfu2(1. Yantai Institute of Coastal Zone Research Chinese Academy of Sciences, Yantai 264003, China; 2. Yantai University, Yantai 264003, Chin)

机构地区：[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

出　　处：《生物质化学工程》2018年第2期35-41,共7页Biomass Chemical Engineering

基　　金：中科院仪器设备功能开发技术创新项目(2017g0061)

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 k J/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H_2O、CO_2、CO、CH_4、甲醇、酚类和N_2O;产物中的CH_4、甲醇、酚类和N_2O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。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 k J/mol at different heating rates. The gas products of pyrolysis analyzed by FTIR contained H_2O,CO_2,CO,CH_4,methanol,phenols and N_2O,in which CH_4,methanol,phenols and N_2O were mainly released at the temperature range from 300 to 500 ℃ and the maximal yields of these gas products were obtained at about 420 ℃.

关 键 词：碱木质素 热解 动力学 热重-红外联用仪 

分 类 号：TS712[轻工技术与工程—制浆造纸工程] TQ35[化学工程]