文献类型：期刊文献

英文题名：Influence of polyvinyl chloride contaminant on chemical recycling of polyethylene via thermal and catalytic pyrolysis

作者：Zhang, Chaoran[1];Li, Zhixiang[1];Cheng, Yan[2];Wang, Wenjie[1];Zhang, Zhongyao[1];Ge, Xiaohu[1];Chen, Wenyao[1];Qian, Gang[1];Cao, Yueqiang[1];Duan, Xuezhi[1];Zhou, Xinggui[1];Zhang, Jing[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn & Low Carbon Technol, Shanghai 200237, Peoples R China;[2]BASF Adv Chem Co, Shanghai, Peoples R China

年份：2026

外文期刊名：AICHE JOURNAL

收录：;EI(收录号：20261120249109);WOS:【SCI-EXPANDED(收录号:WOS:001708314200001)】；

基金：This work was financially supported by BASF Advanced Chemicals Company, National Natural Science Foundation of China (22378117), and the Guangxi Science and Technology Innovation Platform Program (LT2504240028).

语种：英文

外文关键词：dehydrochlorination; kinetic modeling; polyethylene; polyvinyl chloride; zeolite catalysis

摘要：Polyethylene (PE) is the most abundant component of plastic waste. Its chemical recycling primarily relies on pyrolysis, which produces pyrolysis oils that can be catalytically upgraded into light olefins. In practice, PE is often recycled alongside polyvinyl chloride (PVC) contaminants, which are difficult to completely separate given their use in multilayer materials. Upon heating, PVC readily releases acidic hydrogen chloride, which can negatively impact chemical recycling. However, most studies have focused on the chemical recycling of pure PE, with limited attention to the effects of PVC contamination. Here, by employing a pyrolyzer-gas chromatography-mass spectrometry/ flame ionization detector/thermal conductivity detector system, we reveal that PVC contamination significantly increases char formation at the expense of pyrolysis oils-the precursors for monomer recovery. Furthermore, rapid deactivation of the ZSM-5 catalyst is observed, attributed to acidity loss caused by framework aluminum leaching. These deleterious effects are effectively mitigated through an ionic liquid-based dehydrochlorination pretreatment of feedstock, the kinetic model of which is developed.