Formation of chloride products in the MSW (municipal solid wastes) pyrolysis process by Py-GC/MS method with key model components

IF 5.8 2区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Analytical and Applied Pyrolysis Pub Date : 2025-03-31 DOI:10.1016/j.jaap.2025.107113

Yande Cai , Ze Wang , Jianjun Wang , Songgeng Li

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引用次数: 0

Abstract

The formation of chloride products in the process for pyrolysis of municipal solid wastes (MSW) with key model components was investigated by Py-GC/MS method. HCl and CH₃Cl are identified as the most abundant chloride products for the individual pyrolysis of polyvinyl chloride (PVC) or corn straw (CS) in the range of 200–600 °C. For the pyrolysis of CS, a higher temperature is more favorable for the generation of HCl than that of CH₃Cl. In the PVC pyrolytic products, chlorobenzene (Ph-Cl), benzyl chloride (Ph-CH₂Cl), and 1-(chloroethyl)benzene (Ph-CHClCH₃) are also detected but in extremely low amounts. For the co-pyrolysis of PVC/CS, the formation of CH₃Cl is significantly promoted. The synergistic effect in the PVC/CS co-pyrolysis process is mainly attributed to the reaction between the HCl derived from PVC and the decomposition products of lignin. The products of Ph-Cl and Ph-CH₂Cl are mainly generated from the cyclization of Cl-containing chain species. CH₃Cl and Ph-CHClCH₃ are mainly generated from secondary reactions between HCl and other pyrolytic products. No remarkable synergistic effect is observed on the formations of chlorides in the co-pyrolysis of PVC/PP (polypropylene), while the generation of Ph-CHClCH₃ is significantly enhanced in the co-pyrolysis of PVC/PS (polystyrene).

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基于关键模型组分的Py-GC/MS法研究城市生活垃圾热解过程中氯化物产物的形成

采用Py-GC/MS法研究了含关键模型组分的城市生活垃圾热解过程中氯化物产物的形成。在200-600 °C范围内，聚氯乙烯（PVC）或玉米秸秆（CS）的单独热解产物中，HCl和CH3Cl含量最多。对于CS的热解，较高的温度比CH3Cl的生成更有利于HCl的生成。在PVC热解产物中，也检测到氯苯（Ph-Cl）、氯化苄（Ph-CH2Cl）和1-（氯乙基）苯（Ph-CHClCH3），但含量极低。对于PVC/CS共热解，明显促进了CH3Cl的生成。PVC/CS共热解过程中的协同效应主要是由于PVC衍生的HCl与木质素分解产物之间的反应。Ph-Cl和Ph-CH2Cl的产物主要是由含cl链种的环化产生的。CH3Cl和Ph-CHClCH3主要由HCl与其他热解产物的二次反应生成。在PVC/PP（聚丙烯）共热解过程中，氯化物的生成没有明显的协同效应，而在PVC/PS（聚苯乙烯）共热解过程中，Ph-CHClCH3的生成明显增强。

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来源期刊

Journal of Analytical and Applied Pyrolysis 化学-分析化学

CiteScore

9.10

自引率

11.70%

发文量

340

审稿时长

44 days

期刊介绍： The Journal of Analytical and Applied Pyrolysis (JAAP) is devoted to the publication of papers dealing with innovative applications of pyrolysis processes, the characterization of products related to pyrolysis reactions, and investigations of reaction mechanism. To be considered by JAAP, a manuscript should present significant progress in these topics. The novelty must be satisfactorily argued in the cover letter. A manuscript with a cover letter to the editor not addressing the novelty is likely to be rejected without review.