摘要
利用热重仪对黑液热解行为进行研究,毛白杨碱性亚硫酸盐-蒽醌(AS-AQ)法制浆的黑液热解分为4个阶段。随着升温速率的提高,DTG曲线峰值温度增加,侧峰数量减少,剩余固体量增加。采用Zsokó法研究不同阶段动力学参数,结果表明:第一和第三阶段反应级数为1,第二阶段反应级数为4,第四阶段反应级数为2。在整个热解过程中的两个主要阶段为第二阶段(150～450℃)和第三阶段(450～650℃),升温速率为40℃/min时活化能最低,分别为87.380和99.294 kJ/mol;随着升温速率的升高,150～450℃区间活化能降低,450～650℃活化能呈现递增趋势。
The pyrolysis kinetics of Chinese white poplar black liquor was studied via thermogravimetric analysis in present study. The results indicated that the pyrolysis of black liquor was a 4-stage process. The peak temperature of DTG and the solid content increased with the rise of heating rates, while the number of side peaks declined. The analyzed pyrolysis kinetics of by Zsoko method is a complicated model, of which the reaction of the first and third stages was 1st order, the second stage and the last stage were in accordance with the 4th and 2nd reaction order. During the two main stages of the pryolysis process at 150-450 ℃ and 450-650 ℃, the lowest activation energies were observed at the heating rate of 40 ℃/min. They represented 87. 380 and 99. 294 kJ/mol respectively. The activation energy between 150 ℃ and 450 ℃ stage decreased, while it increased during the fol- lowing stage with the rising heating rates.
出处
《林产化学与工业》
EI
CAS
CSCD
北大核心
2013年第3期55-58,共4页
Chemistry and Industry of Forest Products
基金
北京市自然科学基金(NO.3122026)
关键词
黑液
热解
热重
动力学
black liquor
pyrolysis
thermogravimetric
kinetics
