Fast co-pyrolysis characteristics of polyethylene terephthalate and epoxy resin from waste wind turbine blades

IF 5.6 2区工程技术 Q2 ENERGY & FUELS Journal of The Energy Institute Pub Date : 2024-09-21 DOI:10.1016/j.joei.2024.101841

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Abstract

The present study systematically investigated the fast co-pyrolysis characteristics of epoxy resin and polyethylene terephthalate (PET) derived from waste wind turbine blades, with the aim of uncovering the possible synergistic effect in co-pyrolysis. The co-pyrolysis of epoxy resin and PET was beneficial to the formation of pyrolytic char, while the generation of small molecule gaseous products was restrained to a certain degree. The kinetic results revealed that the presence of epoxy resin dramatically reduced the energy barrier for PET decomposition into terephthalic acid (TPA) and vinyl benzoate via a cyclic transition state, finally resulting in an obvious reduction in the activation energy of the pyrolysis reaction. Remarkably, the activation energy for co-pyrolysis sharply decreased to around 150 kJ/mol at a low conversion rate. The co-pyrolysis presented a significant impact on the further transformation of primary pyrolysis products via decarboxylation, deoxygenation, decarbonylation, isomerization, and so on, thus contributing to the selective production of specified chemicals. Furthermore, the plausible reaction pathways and synergistic mechanisms between co-pyrolysis of epoxy resin and PET were discussed thoroughly.

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废弃风力涡轮机叶片中的聚对苯二甲酸乙二醇酯和环氧树脂的快速共热解特性

本研究系统研究了从废弃风力涡轮机叶片中提取的环氧树脂和聚对苯二甲酸乙二酯（PET）的快速共热解特性，旨在揭示共热解过程中可能存在的协同效应。环氧树脂和聚对苯二甲酸乙二醇酯的共热解有利于热解炭的形成，而小分子气态产物的生成则受到一定程度的抑制。动力学结果表明，环氧树脂的存在大大降低了 PET 通过循环过渡态分解成对苯二甲酸（TPA）和苯甲酸乙烯酯的能障，最终导致热解反应的活化能明显降低。值得注意的是，在低转化率条件下，共热解的活化能急剧下降至 150 kJ/mol 左右。共热解对初级热解产物通过脱羧、脱氧、脱羰基、异构化等进一步转化产生了重大影响，从而有助于选择性地生产特定化学品。此外，还深入讨论了环氧树脂和 PET 共同热解的合理反应途径和协同机制。

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来源期刊

Journal of The Energy Institute 工程技术-能源与燃料

CiteScore

10.60

自引率

5.30%

发文量

166

审稿时长

16 days

期刊介绍： The Journal of the Energy Institute provides peer reviewed coverage of original high quality research on energy, engineering and technology.The coverage is broad and the main areas of interest include: Combustion engineering and associated technologies; process heating; power generation; engines and propulsion; emissions and environmental pollution control; clean coal technologies; carbon abatement technologies Emissions and environmental pollution control; safety and hazards; Clean coal technologies; carbon abatement technologies, including carbon capture and storage, CCS; Petroleum engineering and fuel quality, including storage and transport Alternative energy sources; biomass utilisation and biomass conversion technologies; energy from waste, incineration and recycling Energy conversion, energy recovery and energy efficiency; space heating, fuel cells, heat pumps and cooling systems Energy storage The journal''s coverage reflects changes in energy technology that result from the transition to more efficient energy production and end use together with reduced carbon emission.