摘要
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.
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 × 10^8 s^-1 , respectively.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2008年第10期2526-2530,共5页
CIESC Journal
基金
国家自然科学基金项目(30560119)
广西青年科学基金项目(0640001
0832008)
广西自然科学基金项目(0575003)
广西研究生教育创新计划项目(2007105930817D06
2006105930817M30)
广西大学科研基金项目(X071071)
教育部高等学校博士学科点专项科研基金项目(20070593004)~~
关键词
脱氢枞酸
热分解动力学
活化能
熔化焓
熔化熵
dehydroabietic acid
kinetics of thermal decomposition
activation energy
enthalpy of fusion
entropy of fusion
