脱氢枞酸在空气中的热分解动力学  

Thermal decomposition kinetics of dehydroabietic acid in air

作　　者：祝远姣[1] 陈小鹏[1] 王琳琳[1] 钟华[1] 梁杰珍[1] 童张法[1] 

机构地区：[1]广西大学化学化工学院,广西南宁530004

出　　处：《化工学报》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)~~

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.

关 键 词：脱氢枞酸 热分解动力学 活化能 熔化焓 熔化熵 

分 类 号：O643[理学—物理化学]