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采用气相色谱-质谱法并结合热重分析法对聚氯乙烯(PVC)的热裂解行为进行了研究。首先对PVC的热失重行为进行考察,确定最佳裂解温度;然后分别在350℃和600℃下对PVC进行热裂解,并用气相色谱-质谱联用仪对裂解产物进行定性和半定量分析。结果表明:在350℃下,PVC裂解产物主要以HCl和苯等易挥发物质为主;在600℃下,裂解产物为多环芳烃,但未检测到HCl。根据裂解产物的种类及相对含量的变化,确定PVC的分段裂解回收工艺,从而提高了热裂解产物的回收率和热裂解效率。
The pyrolysis behavior of polyvinyl chloride (PVC) was studied by gas chromatography-mass spectrometry and thermogravimetric analysis. First of all, the thermal degradation behavior of PVC was investigated to determine the optimal pyrolysis temperature. Then the PVC was pyrolyzed at 350 ℃ and 600 ℃ respectively, and the pyrolysis products were qualitatively and semi-quantitatively analyzed by gas chromatography-mass spectrometry. The results showed that at 350 ℃, the main products of PVC pyrolysis were mainly volatile substances such as HCl and benzene. At 600 ℃, the pyrolysis products were polycyclic aromatic hydrocarbons but no HCl was detected. According to the type and relative content of pyrolysis products, the segmented pyrolysis recovery process of PVC was determined, which improved the recovery rate and pyrolysis efficiency of pyrolysis products.