Effect of typical impurities on the pyrolysis oil of waste plastics

被引：0

作者：

Sun K. ^{[1
]}

Wang W. ^{[1
]}

Huang Q. ^{[1
]}

机构：

[1] State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou

来源：

Huagong Jinzhan/Chemical Industry and Engineering Progress | 2021年 / 40卷 / 06期

关键词：

Impurity; Oil; Plastic; Polymer; Pyrolysis; Waste treatment;

D O I：

10.16085/j.issn.1000-6613.2020-1468

中图分类号：

学科分类号：

摘要：

Fine impurity particles were separated from the waste plastics at four waste disposal sites and used as additives in the pyrolysis of pure plastics in order to study the effect of impurities on the oil quality during the pyrolysis of non-recyclable waste plastics. The effects of four types of impurities (I1-I4) on polyethylene, polypropylene, polystyrene and their mixture were investigated, as well as the role of organics and inorganics in the impurities. The additives increased the concentration of primary components in oil from 65.5% to 79.2%-90.3%. The highest concentration was obtained with impurity sample I4, collected at a bicycle dismantling plant. I4 also increased the alkenes in the polyethylene/polypropylene pyrolysis oil by 25.0% and 21.1%, but had no significant effect on polystyrene pyrolysis. The I4 had 3 effects on the pyrolysis of plastics: inorganic ash acting as a heat carrier, the catalytic effect of specific active ash components and the effect of organics in the impurities. Ash as a heat carrier promoted the cleavage of polymer chains. Active ash components catalyzed hydrogenation and hydrogen transfer reaction. Pyrolysis of the organic components in I4 produced additional aromatics and alkenes. The study would provide guidance for the pretreatment and oil quality control in the large-scale waste plastic pyrolysis process. © 2021, Chemical Industry Press Co., Ltd. All right reserved.

引用

页码：3499 / 3506

页数：7

共 29 条

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