Chemistry Program, Department of Natural and Exact Sciences, San Pablo Campus, University of Cartgena, Cartagena 130015, Colombia.
Chemical Engineering Program, School of Engineering, Universidad Tecnológica de Bolivar, Parque Industrial y Tecnológico Carlos Vélez Pombo Km 1 Vía Turbaco, Cartagena 130001, Colombia.
Int J Mol Sci. 2023 Mar 11;24(6):5397. doi: 10.3390/ijms24065397.
In this study, the thermal degradation and pyrolysis of hospital plastic waste consisting of polyethylene (PE), polystyrene (PS), and polypropylene (PP) were investigated using TG-GC/MS. The identified molecules with the functional groups of alkanes, alkenes, alkynes, alcohols, aromatics, phenols, CO and CO were found in the gas stream from pyrolysis and oxidation, and are chemical structures with derivatives of aromatic rings. They are mainly related to the degradation of PS hospital waste, and the alkanes and alkenes groups originate mainly from PP and PE-based medical waste. The pyrolysis of this hospital waste did not show the presence of derivatives of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans, which is an advantage over classical incineration methodologies. CO, CO, phenol, acetic acid and benzoic acid concentrations were higher in the gases from the oxidative degradation than in those generated in the pyrolysis with helium. In this article, we propose different pathways of reaction mechanisms that allow us to explain the presence of molecules with other functional groups, such as alkanes, alkenes, carboxylic acids, alcohols, aromatics and permanent gases.
在这项研究中，使用 TG-GC/MS 研究了由聚乙烯 (PE)、聚苯乙烯 (PS) 和聚丙烯 (PP) 组成的医院塑料废物的热降解和热解。在热解和氧化过程中从气流中鉴定出具有烷烃、烯烃、炔烃、醇、芳烃、酚、CO 和 CO 官能团的分子，这些是具有芳烃衍生物的化学结构。它们主要与 PS 医院废物的降解有关，烷烃和烯烃基团主要来源于基于 PP 和 PE 的医疗废物。这种医院废物的热解没有显示出多氯二苯并对二恶英和多氯二苯并呋喃衍生物的存在，这是优于经典焚烧方法的优点。在氧化降解产生的气体中，CO、CO、苯酚、乙酸和苯甲酸的浓度高于氦气热解产生的气体。在本文中，我们提出了不同的反应机制途径，这些途径使我们能够解释其他官能团分子的存在，例如烷烃、烯烃、羧酸、醇、芳烃和永久气体。
