化工学报 ›› 2008, Vol. 59 ›› Issue (10): 2526-2530.

• 催化、动力学与反应器 • 上一篇    下一篇

脱氢枞酸在空气中的热分解动力学

祝远姣; 陈小鹏; 王琳琳; 钟华;梁杰珍;童张法   

  1. 广西大学化学化工学院
  • 出版日期:2008-10-05 发布日期:2008-10-05

Thermal decomposition kinetics of dehydroabietic acid in air

ZHU Yuanjiao; CHEN Xiaopeng; WANG Linlin; ZHONG Hua; LIANG Jiezhen;TONG Zhangfa   

  • Online:2008-10-05 Published:2008-10-05

摘要: 采用TG/DTA/DSC热分析技术,在线性升温速率为5、10、15和20 K·min-1和静态空气条件下,研究了脱氢枞酸在空气气氛中的热分解动力学。由热重/差热法(TG/DTA)得到脱氢枞酸在空气中是一步分解;运用差示扫描量热法(DSC)测定了脱氢枞酸的熔点为445.05K,摩尔熔化焓为19.74 kJ·mol-1和摩尔熔化熵为44.35J·mol-1·K-1;分别利用Kissinger法和Flynn-Wall-Ozawa法对脱氢枞酸非等温热分解数据进行了动力学分析,同时利用Satava-Sestak法研究了脱氢枞酸的热分解机理。结果表明,脱氢枞酸的热分解机理为收缩球状界面反应模型R3,热分解反应的表观活化能为107.89 kJ·mol-1,指前因子为9.33×108 s-1)。

关键词:

脱氢枞酸, 热分解动力学, 活化能, 熔化焓, 熔化熵

Abstract:

The thermal decomposition kinetics of dehydroabietic acid in static state air was investigated by TG/DTA/DSC techniques with various heating rates of 5, 10, 15 and 20 K·min-1TG/ DTA curves showed that decomposition proceeded through a welldefined step in airThe melting point, molar enthalpy and entropy of fusion of dehydroabietic acid were determined as 445.05 K, 19.74 kJ·mol-1 and 44.35 J·mol-1·K-1, by differential scanning calorimetry (DSC)The nonisothermal kinetics parameters were analyzed by means of the Kissinger and FlynnWallOzawa methods, and the thermal decomposition mechanism of dehydroabietic acid was also studied with the SatavaSestak methodThe results showed that the thermal decomposition mechanism of dehydroabietic acid in air was controlled by interface reaction R3 , and the apparent activation energy and preexponential factor were 107.89 kJ·mol-1 and 9.33×108 s-1, respectively.

Key words:

脱氢枞酸, 热分解动力学, 活化能, 熔化焓, 熔化熵