枞酸的热分解反应  

Thermal Decomposition Reaction of Abietic Acid

作　　者：刘红军[1] 谭卫红[1] 周永红[1] 张猛[1] 

机构地区：[1]中国林业科学研究院林产化学工业研究所国家林业局林产化学工程重点开放性实验室,南京210042

出　　处：《林业科学》2012年第8期123-128,共6页Scientia Silvae Sinicae

基　　金：国家“十二五”科技支撑项目(2012BAD32B05)

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.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 ahietic 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 abietie 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, 2096.4 J·g^-1, 1.469 J·g^-1 K^-1, 1. 163 J·g^-1 K^-1 and 4.769 J·g^-1 K^-1, respectively.

关 键 词：枞酸 热分析 热分解动力学 比热容 

分 类 号：TQ351.471[化学工程]