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用单光子离子化 (SPI) /共振增强的多光子离子化 (REMPI) 飞行时间质谱法对PVC材料的燃烧裂变过程进行了在线研究 ,发现与其它有机材料不同 ,PVC涂层材料在 30 0℃时即发生裂变 ,生成苯系物、萘及少量多环芳烃。在空气条件下 ,产生酚类有机污染物。在 70 0℃和 80 0℃的低流速空气环境中检测到了二英的前体物———氯代苯 (MCB)、氯代酚及氯乙烯单体 ,预示着二英的形成 ,并可间接在线监测二英的浓度。在各温度条件下都有多环芳烃 (PAHs)产生 ,但在 70 0℃～ 80 0℃时 ,产生的数量最多。提高空气流速可大大降低MCB和PAHs的产生。在 1 0 0 0℃～ 1 1 90℃时 ,燃烧趋于完全
The single photon ionization (SPI) / resonance enhanced multiphoton ionization (REMPI) time-of-flight mass spectrometry was used to investigate the fission process of PVC. The results show that, unlike other organic materials, When fission occurs, generating benzene, naphthalene and a small amount of polycyclic aromatic hydrocarbons. Under air conditions, phenolic organic pollutants are produced. The precursors of dioxins, such as chlorobenzene (MCB), chlorinated phenols and vinyl chloride monomer, were detected in air with low flow rate at 70 0 ℃ and 80 0 ℃, indicating the formation of dioxins, And can be indirectly online monitoring two Ying British concentration. Polycyclic aromatic hydrocarbons (PAHs) are produced at all temperature conditions, but are most abundant at 70 0 ° C to 80 0 ° C. Increasing the air flow rate can greatly reduce the production of MCB and PAHs. At 100 ℃ ~ 1190 ℃, the combustion tends to be complete