Nonisothermal Decomposition Kinetics of Abietic Acid in Argon Atmosphere

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• 作者：Weijian Nong ; Xiaopeng Chen ; Linlin Wang ; Jiezhen Liang ; Lingping Zhong ; Zhangfa Tong
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2011
• 出版时间：December 21, 2011
• 年：2011
• 卷：50
• 期：24
• 页码：13727-13731
• 全文大小：759K
• 年卷期：v.50,no.24(December 21, 2011)
• ISSN：1520-5045

文摘

Abietic acid was isolated from rosin by means of reaction-crystallization coupled with exposure to ultrasonic waves, and it was then characterized by its specific rotation, infrared spectra, and ¹³C nuclear magnetic resonance spectra. The thermal decomposition of abietic acid in argon atmosphere was studied under nonisothermal conditions using TG-DTG techniques with heating rates of 5, 10, 20, and 25 K/min. For the kinetic study, the nonisothermal kinetic parameters were obtained via the analysis of the TG-DTG curves by using the Flynn-Wall-Ozawa (FWO) method, the Kissinger method, and the integral method. The results showed that the nonisothermal decomposition mechanism of abietic acid in argon atmosphere followed Mampel Power law with n = 3/2, whose differential and integral forms were f(伪) = 2/3伪^鈥?/2 and G(伪) = 伪^3/2. The apparent activation energy E_a and the pre-exponential factor A were 123.44 kJ/mol and 1.78 脳 10¹¹ s^鈥?, respectively. The kinetic equation can be expressed as d伪/dt = 1.19 脳 10¹¹伪^鈥?/2 exp(鈭?.48 脳 10⁴/T). The thermodynamic parameters (螖H, 螖G, and 螖S) were calculated as well.