邻苯二甲酸钙的热分解反应研究

The Thermal Decomposition of Calcium Phthalate

用热重和示差扫描量热分析法研究了—水合邻苯二甲酸钙的热分解过程.其热分解过程分为三个阶段:在160～260℃脱水生成无水盐;在460～780℃分解生成CaCO_3·C;在780～900℃生成CaO和CO.用粉末X射线衍射、红外光谱和色-质联用分析法表征了各阶段热分解产物的组成和结构,讨论了热分解产物的自由基反应机理.

The thermal decomposition of calcium phthalate monohydrate, CaC8H4O4 · H2O, was studied by thermogravimetric analysis and differential scanning calorimetry. The products of thermal decomposition at various stages were characterized by the powder X-ray diffraction, infrared spectrometry and gas chromatography-mass spectrometry. The radical reactions in the pyrolytic process were discussed. The thermal decomposition of CaC8H4O4 · H2O proceeds in three stages: It was dehydrated at 160-260℃, pyrolyzed to form CaCO3 · C at 460-780℃ and CaO at 780- 900℃. Pyrolysis of CaC8H4O4 at 500℃ gave (C6H5)2CO and CO as the main volatile products, with a large amount of fluorenone, 9,10-anthraquinone, diphenylmethane, etc.