裂解气相色谱-质谱法研究增塑剂邻苯二甲酸二丁酯的热降解

探讨了无氧条件，温度范围在500～750 ℃内邻苯二甲酸二丁酯(DBP)的热裂解行为，利用GC/MS定性测定其裂解产物，讨论部分产物与裂解温度之间的关系。实验结果表明：低于650 ℃时，邻苯二甲酸二丁酯的裂解产物主要为2-丁烯、1-丁醇、邻苯二甲酸酐和苯甲酸丁酯，并且随温度的升高裂解产物变得复杂；温度升高到700 ℃，邻苯二甲酸酐、苯甲酸丁酯进一步裂解成为分子质量更小的自由基，并发生稠环化反应，形成更稳定的菲、蒽等芳香族多环化合物。根据分析实验提供的裂解产物信息，增塑剂DBP在高温下裂解会产生多环芳烃污染物，而这些特性将为塑料热解再生利用过程中的环境保护提供一定的依据。

Study on Thermal Decomposition of Dibutyl Phthalate by Pyrolysis GC/MS

The pyrolysis characteristic study of dibutyl phthalate (DBP) at different temperatures was performed under anaerobic conditions. The quantitative analysis of the pyrolysis products was researched by GC/MS. The relationships of some products and pyrolysis temperatures were discussed. The main pyrolysis products of DBP are 2-butene, 1-butanol, and the component is complex with the increase of temperature, when the temperature is below 650 ℃. Phthalic anhydride and butyl benzoate are pyrolysised into smaller mass radicals, and polycyclic aromatic hydrocarbons such as phenanthrene, anthracene are found at 700 ℃. These characteristics are helpful for the environmental protection in study of recovery and reuse of plastic by pyrolysis.