Thermal degradation of medical plastic waste by in-situ FTIR, TG-MS and TG-GC/MS coupled analyses
Thermal degradation of medical plastic waste by in-situ FTIR, TG-MS and TG-GC/MS coupled analyses
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通过原位 FTIR、TG-MS 和 TG-GC/MS 耦合分析对医用塑料废物进行热降解
DOI：
10.1016/j.jaap.2018.10.012
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发表时间：
2018-11-01
影响因子：
6
通讯作者：
Xing, Futang
中科院分区：
文献类型：
--
作者：
Qin, Linbo;Han, Jun;Xing, Futang
在本文中，使用惰性和氧化大气下研究了主要由聚苯乙烯（PS）和聚丙烯（PP）组成的医用塑料废物的热降解（药剂塑料瓶和塑料输液袋的混合物），使用原子和氧化大气下进行了研究。同时，还讨论了医用塑料废物热降解过程中的气体演化曲线以及分解残基的功能组。脂肪族C-H，芳香的C = C和芳香的CEH表现出巨大的变化，表明医用塑料废物在约100摄氏度的情况下开始玻璃化，开始降解300摄氏度，并在惯用气氛下达到最大值至最大值接近400度C。初始热解产物。芳香族化合物主要归因于PS降解，而烷烃和烷烃主要源自PP吱吱作响。还发现，在整个温度范围内的峰值和相关阶段，气态进化曲线与DTG曲线非常一致。与惰性大气中医疗塑料废物的热降解相比，医用塑料废物的初始降解温度转移到较低的温度，而在氧化大气中，由于氧化碳酸，苯酚，苯酚和苯二醇而导致的氧化烃大气中的降解速率显着降低。最后，还提出了最初的吱吱作响的机制以及由医用塑料废物热降解产生的主要挥发物的次要反应途径。
In this paper, thermal degradation of medical plastic waste (the blends of medicinal plastic bottles and plastic infusion bag) that mainly composed of polystyrene (PS) and polypropylene (PP) is studied under both inert and oxidative atmospheres using in-situ FTIR, TG-MS and TG-GC/MS coupled analyses. Meanwhile, the gas evolution profiles as well as the function groups of the decomposition residues during medical plastic waste thermal degradation are also discussed. The aliphatic C-H, aromatic C=C and aromatic CeH exhibit the dramatically vary with temperature, indicating the medical plastic waste begins vitrifying at about 100 degrees C, starts degrading around 300 degrees C and reaches to the maximum near 400 degrees C in inert atmosphere, produces mainly styrene, benzene, toluene, and small amounts of C-1-C-4 aliphatic hydrocarbons as the initial pyrolysis products. The aromatic compounds are mainly ascribed to PS degradation, and alkanes and alkenes are mainly originated from PP creaking. It is also found that the gaseous evolution profiles are well consistent with DTG curves in terms of appearance of peaks and relevant stages in the whole temperature range. Compared with thermal degradation of medical plastic waste in inert atmosphere, the initial degradation temperature for the medical plastic waste is shifted to lower temperature, while the degradation rate is reduced significantly in the oxidative atmosphere that produces oxygenated hydrocarbons such as acetic acid, phenol and benzoic acid due to the O-atom attack. Lastly, the initial creaking mechanism together with the secondary reaction pathways of the primary volatiles produced from medical plastic waste thermal degradation are also proposed.