Stepwise dechlorination and co-pyrolysis of poplar wood with dechlorinated polyvinyl chloride: Synergistic effect and products distribution

IF 5.6 2区 工程技术 Q2 ENERGY & FUELS
Zihao Yang, Shengli Niu, Jie Zhu, Jie Geng, Jisen Liu, Kuihua Han, Yongzheng Wang, Sunwen Xia
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Abstract

With the combination of stepwise dechlorination and co-pyrolysis techniques, this study conducted polyvinyl chloride (PVC) dechlorination experiments and co-pyrolysis experiments of poplar wood (PW) with dechlorinated polyvinyl chloride (DPVC) by thermogravimetric analysis and a fixed bed reactor. Stepwise pyrolysis effectively removed Cl from PVC with a dechlorination efficiency of 99.84 % at 360 °C for 30 min. Thermogravimetric tests and thermokinetic variables were employed to describe the co-pyrolysis process's thermodynamic behavior, where co-pyrolysis significantly diminished the activation energy of the initial pyrolysis stage (9.65–21.62 kJ/mol) and increased the reaction rate (0.02–0.09 %/°C). The synergistic effect of co-pyrolysis enhanced the yield and quality of liquid oil and reduced the solid residue rate, with the maximum change in solid residue rate (−2.36 wt%) occurring at PW:DPVC = 3:7. The optimal conditions for the synergistic effect are a raw material ratio of 3:7 at 500 °C. Co-pyrolysis efficiently reduced the content of oxygen-containing compounds of phenols, ketones, and acids in oil, and elevated the selectivity of aromatics. The research methods avoid the drawbacks of bio-oil and plastic oil and improve the quality of pyrolysis oil in a concise and efficient manner, which provides some new ideas for the resource and clean utilization of municipal waste.

Abstract Image

杨木与脱氯聚氯乙烯的逐步脱氯和共聚解作用:协同效应和产品分布
本研究结合分步脱氯和共热解技术,通过热重分析和固定床反应器,进行了聚氯乙烯(PVC)脱氯实验和杨木(PW)与脱氯聚氯乙烯(DPVC)的共热解实验。在 360 ℃、30 分钟的条件下,逐步热解可有效去除聚氯乙烯中的氯,脱氯效率为 99.84%。热重试验和热动力学变量被用来描述共热解过程的热力学行为,其中共热解显著降低了初始热解阶段的活化能(9.65-21.62 kJ/mol),并提高了反应速率(0.02-0.09 %/°C)。协同热解的协同效应提高了液体油的产量和质量,降低了固体残渣率,在 PW:DPVC = 3:7 时固体残渣率变化最大(-2.36 wt%)。产生协同效应的最佳条件是原料比为 3:7、温度为 500 ℃。协同热解有效降低了油中酚、酮、酸等含氧化合物的含量,提高了芳烃的选择性。该研究方法避免了生物油和塑料油的缺点,简洁高效地提高了热解油的质量,为城市垃圾的资源化和清洁利用提供了新思路。
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来源期刊
Journal of The Energy Institute
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.
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