TG-FTIR and Py-GC/MS study of the pyrolysis mechanism and composition of volatiles from flash pyrolysis of PVC

Zhou, Jingjing; Liu, Guijian; Wang, Shuibing; Zhang, Hong; Xu, Fanfan

doi:10.1016/j.joei.2020.07.009

Cited by 97 publications

(33 citation statements)

References 42 publications

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“…34 The mass-to-nucleus ratio of the pyrolysis product was relatively small and the pyrolysis product was relatively clear, so the substance corresponding to the mass-to-nucleus ratio was unique and certain. 35,36 Methane molecules mainly escaped at 393 °C with an increase in temperature. HCN only appeared at around 500 °C.…”

Section: Resultsmentioning

confidence: 99%

Mechanism Study on Nitrogen Migration and Catalytic Denitrification during the Pyrolysis of Lysine and Tryptophan

et al. 2021

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Catalytic fast pyrolysis can effectively solve the pollution and treatment problems of sewage sludge to realize the green recycling of biomass waste energy. The study on the mechanism of nitrogen migration is a crucial part of the conversion of sewage sludge. Herein, two amino acids of lysine with linear amines and tryptophan with aromatic nitrogen-containing heterocycles were used as typical model compounds to investigate the pyrolysis mechanism and nitrogen migration behavior. The results revealed that lysine mainly underwent two routes: one was to cyclize itself to lactam and cleavage twice with the gradual dehydrogenation to form stable nitrogen-containing heterocycles; the second was first decarboxylation and then cleavage with gradual dehydrogenation to form nitriles. The first route was easier to proceed at low temperatures, while the second route took up more proportions at high temperatures. Tryptophan was converted gradually to stable indoles after decarboxylation, deamination, dehydrogenation, and denitrification. Based on the full understanding of the nitrogen migration mechanism of lysine and tryptophan, the catalytic denitrification mechanism over dolomite, limonite, and HZSM-5 modified with Ni loading catalysts was also explored.

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Section: Resultsmentioning

confidence: 99%

Mechanism Study on Nitrogen Migration and Catalytic Denitrification during the Pyrolysis of Lysine and Tryptophan

et al. 2021

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“…In addition, the flash pyrolysis of PVC was conducted with a temperature reaction up to 500 °C. The major products were HCl, alkenes, monocyclic aromatics, and PAHs at 3.02%, 2.86%, 33.5%, and 48.3%, respectively [ 128 ].…”

Section: Waste Plastic Recycling and Technologymentioning

confidence: 99%

Current Prospects for Plastic Waste Treatment

et al. 2022

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The excessive amount of global plastic produced over the past century, together with poor waste management, has raised concerns about environmental sustainability. Plastic recycling has become a practical approach for diminishing plastic waste and maintaining sustainability among plastic waste management methods. Chemical and mechanical recycling are the typical approaches to recycling plastic waste, with a simple process, low cost, environmentally friendly process, and potential profitability. Several plastic materials, such as polypropylene, polystyrene, polyvinyl chloride, high-density polyethylene, low-density polyethylene, and polyurethanes, can be recycled with chemical and mechanical recycling approaches. Nevertheless, due to plastic waste’s varying physical and chemical properties, plastic waste separation becomes a challenge. Hence, a reliable and effective plastic waste separation technology is critical for increasing plastic waste’s value and recycling rate. Integrating recycling and plastic waste separation technologies would be an efficient method for reducing the accumulation of environmental contaminants produced by plastic waste, especially in industrial uses. This review addresses recent advances in plastic waste recycling technology, mainly with chemical recycling. The article also discusses the current recycling technology for various plastic materials.

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“…Meanwhile, quantitative pyrolysis coupled with more sophisticated characterization techniques such as GC/MS reveal chemical structural attributes of complex feed in addition to unique features of volatile species. 318 Similarly, TGA coupled with GC/MS has also been used to identify the chemical formula/structure of volatile products. 319 Undoubtedly, these advanced techniques provide rapid solutions to process design and optimization, catalyst evaluation, choice of feed and composition, and understanding synergetic effects during copyrolysis.…”

Section: Kinetic and Mechanistic Aspects Of Wastementioning

confidence: 99%

“…A combined study of weight loss and kinetic parameters obtained from TGA with simultaneous detection of functional groups in volatile species by FT-IR provides significant understanding over the mechanism and kinetics of the reaction. , Unfortunately, TG-FTIR is not effective in identifying specific volatile substances. Meanwhile, quantitative pyrolysis coupled with more sophisticated characterization techniques such as GC/MS reveal chemical structural attributes of complex feed in addition to unique features of volatile species . Similarly, TGA coupled with GC/MS has also been used to identify the chemical formula/structure of volatile products .…”

Section: Kinetic and Mechanistic Aspects Of Waste Plastics Pyrolysismentioning

confidence: 99%

Thermochemical Recycling of Waste Plastics by Pyrolysis: A Review

et al. 2021

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The increasing demand for plastics for their widespread applications has ultimately resulted in accumulation of substantial plastic waste, which remains a concern due to limited efforts, inadequacy, and environmental distresses of conventional techniques for waste plastics remediation. The enhanced production of raw materials for polymer syntheses has a dual impact on our ecosystem by causing rapid depletion of nonrenewable petroleum resources and waste generation. To address this situation, researchers have adopted advanced thermochemical recycling processes to produce intermediate products of the petrochemical industries including monomers, fuels, and other value-added products. Such practices can potentially serve the purpose of a circular economy. This review aims to cover the recent highlights in the field of waste plastics pyrolysis including critical observations from the past to provide precise understanding. Consequently, the reactivities and product distributions for plastic feeds, pyrolysis reactors, roles of catalysts, and effects of operating parameters on reactivity and selectivity have been covered. Coprocessing of plastic waste with radioactive materials, biomass, and heavy petroleum residue is also discussed. Furthermore, an overview on kinetics and mechanistic aspects of plastic pyrolysis is presented with a discussion on relevant analytical techniques. The applications of pyrolysis oil as a fuel or fuel additive are comprised in a separate section. Lastly, comparisons of existing chemical recycling technologies, summaries of commercial operations, and future projections are provided.

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TG-FTIR and Py-GC/MS study of the pyrolysis mechanism and composition of volatiles from flash pyrolysis of PVC

Cited by 97 publications

References 42 publications

Mechanism Study on Nitrogen Migration and Catalytic Denitrification during the Pyrolysis of Lysine and Tryptophan

Mechanism Study on Nitrogen Migration and Catalytic Denitrification during the Pyrolysis of Lysine and Tryptophan

Current Prospects for Plastic Waste Treatment

Thermochemical Recycling of Waste Plastics by Pyrolysis: A Review

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