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Position: Home > Articles > Thermal Decomposition Reaction of Abietic Acid Scientia Silvae Sinicae 2012,48 (8) 123-128

枞酸的热分解反应

作  者:
刘红军;谭卫红;周永红;张猛
单  位:
中国林业科学研究院林产化学工业研究所
关键词:
枞酸;热分析;热分解动力学;比热容
摘  要:
使用纯度99.32%的环状二萜化合物枞酸样品,通过TG,DCS,TG-MS研究枞酸的热分解反应和反应机制,得到其热分解反应的活化能Ea在质量损失20%,40%,60%时分别为12.76,12.96,11.81kJ·mol-1,从362.2℃开始开环分解、气化,气化热ΔH为2096.4J·g-1,分解质量损失的主要物质为m/z40~90的小分子,分解反应过程首先是脱去异丙基、羧基,然后开环分解,枞酸受热的相变过程中融熔热ΔH为49.3J·g-1,固态比热容均值是1.469J·g-1K-1,液态为1.163J·g-1K-1,由固体变液体的相变比热容是4.769J·g-1K-1
译  名:
Thermal Decomposition Reaction of Abietic Acid
作  者:
Liu Hongjun Tan Weihong Zhou Yonghong Zhang Meng (Institute of Chemical Industry of Forest Products, CAF Key and Open Lab. on Forest Chemical Engineering, SFA Nanjing 210042)
关键词:
abietic acid; thermal analysis; thermal decomposition kinetics; heat capacity
摘  要:
The decomposition reaction and mechanism of abietic acid with the purity 99.32% was tested by thermogravimetric analysis (TG),differential scanning calorimetry (DSC) and thermogravimetric analyzer coupled to a quadrupole mass spectrometer(TG-MS). The thermal decomposition activation energy of abietic acid at 20%(TG) , 40%(TG) , 60%(TG) were 12.76, 12.96, 11.81 kJ·mol-1, respectively. The results of TG-MS showed that there are micromolecules, whose m/z are between 40 to 90 when decomposed after 362.2 ℃, which proved that the decomposition process of abietic acid is first off isopropyl, carboxyl, and then open-ring. The fusion heat, heat of gasification, heat capacity of solid state, liquid state and phase change form solid to liquid were 49.3 J·g-1, 2 096.4 J·g-1, 1.469 J·g-1K-1, 1.163 J·g-1K-1 and 4.769 J·g-1K-1, respectively.

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