Cocracking Kinetics of PE/PP and PE/Hydrocarbon Mixtures (I) PE/PP Mixtures

Jing, Xudong; Yan, Guoxun; Zhao, Yuehong; Wen, Hao; Xu, Zhiwei

doi:10.1021/ef5008243

Cited by 22 publications

(10 citation statements)

References 27 publications

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“…18 There are some indications that copyrolysis of PP and PE might reduce activation energy and maximum decomposition temperature when mixed at a certain ratio. 19,20 Last but not least, the mixing of PE/PP/PS/PET in co-pyrolysis was performed by Muhammad et al 21 It was found that the mixture seems to produce more aromatic products (styrene, toluene) than expected from proportions of individual products.…”

Section: Introductionmentioning

confidence: 99%

Co-pyrolysis of Mixed Plastics and Cellulose: An Interaction Study by Py-GC×GC/MS

et al. 2017

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Understanding of the interaction between cellulose and various plastics is crucial for designing waste-to-energy processes. In this work, co-pyrolysis of polystyrene (PS) and cellulose was performed in a Py-GC×GC/MS system at 450–600 °C with ratios 70:30, 50:50, and 30:70. Polypropylene (PP), polyethylene (PE), and polyethylene terephthalate (PET) were then added to the mixture with different ratios. It was found that co-pyrolysis of PS and cellulose promotes the formation of aromatic products with a large increase in the yield of ethylbenzene as compared to the calculated value from individual feedstock. This indicates interactions between cellulose and PS pyrolysis products. Observations from experiments including more than one type of plastics indicate that the interactions between different plastics are more pronounced than the interaction between plastics and cellulose.

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Section: Introductionmentioning

confidence: 99%

Co-pyrolysis of Mixed Plastics and Cellulose: An Interaction Study by Py-GC×GC/MS

et al. 2017

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“…As we all know, the thermal decomposition process of plastics is complex and the composition of products from polyolefin pyrolysis is widely different due to the thermal behavior and the reactivity of these plastics. Pyrolysis kinetics of plastics has been carried out on many studies based on the thermogravimetric analysis (TGA) technique, − and most of the studies have mainly focused on the virgin materials. Furthermore, awareness of the kinetic information (e.g., reaction rate, activation energy, or preexponential factor) on different plastics (virgin and waste) was seldom discussed.…”

Section: Introductionmentioning

confidence: 99%

Thermal Cracking of Virgin and Waste Plastics of PP and LDPE in a Semibatch Reactor under Atmospheric Pressure

et al. 2015

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Study of the decomposition kinetics, pyrolysis products, and even reaction mechanisms plays an important role for the development of polymer recycling. In the present research, the kinetics of virgin and waste polypropylene (PP) and lowdensity polyethylene (LDPE) were studied by a modified Coats−Redfern method. Afterward, thermal cracking of them in a semibatch reactor under atmospheric pressure in nitrogen has been investigated. Both virgin and waste plastics are decomposed at 420−460 °C, and the products have been characterized using GC, FT-IR, 1 H NMR, and GC-MS. The reaction path and the degradation mechanism for the thermal cracking of polymer in this study were also discussed. The lower activation energy of waste PP and LDPE indicates that waste plastics degrade at lower initial temperature and may favor mild conditions. Due to the short residence time, the higher gaseous and liquid yields were obtained for virgin PP and LDPE. A large amount of residues for waste polymer indicates that it is a favorable way to degrade waste plastics in a semibatch reactor without further separation. Chain scission reactions are the predominant degradation mechanism in this thermal cracking process. The significant content of unsaturated hydrocarbons in PP thermal cracking products shows the intramolecular hydrogen transfer and β-scission reactions are predominant. In the case of LDPE, intermolecular hydrogen transfer and β-disproportionate reactions also occur. For thermal cracking polymer in a semibatch reactor under atmospheric pressure, the high yields of gasoline (C 6 −C 12 ) and diesel (C 13 −C 22 ) fraction in liquid products confirm that it is a desirable way to realize waste plastics recovery.

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“…Thermogravimetric analysis (TGA) has been widely used to determine the rate of polymer degradation and the influence of major process variables. − Response surface methodology (RSM) was used to predict the influence of experimental conditions on product yield. ,, Reaction temperature and time have been identified to be major factors in previous studies. , Additional factors such as feed size, feed quantity and inert (nitrogen) gas flow rate have also been previously investigated and were included in this study as well …”

Section: Introductionmentioning

confidence: 99%

Catalytic Thermal Cracking of Postconsumer Waste Plastics to Fuels. 1. Kinetics and Optimization

et al. 2015

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Thermogravimetric analysis (TGA) was used to investigate thermal and catalytic pyrolysis of waste plastics such as prescription bottles (polypropylene/PP), high density polyethylene, landfill liners (polyethylene/PE), packing materials (polystyrene/PS), and foams (polyurethane/PU) into crude plastic oils. In the first phase of this investigation, a statistical design experiments approach identified reaction temperature and time as the most important factors influencing product oil yield. Kinetic parameters including activation energy determined for both catalytic and noncatalytic processes showed a reduction in activation energy for the catalytic reactions. In the second phase, the interactions of reaction temperature and time with a number of catalysts were investigated to determine the effect on the yield of crude plastic oil. It was found that Y-zeolites increased conversion at reduced temperature for PP and PE while spent fluid catalytic cracking and sulfated zirconia catalysts supported pyrolytic decomposition of PS and PU foams. Response surface methodology (RSM) was utilized to optimize TGA conditions for pyrolytic decomposition of PP. The results were then validated through batch scale experiments, and the resulting crude oils were characterized and distilled into motor gasoline, diesel #1, diesel #2, and vacuum gas oil fractions. Catalysts enhanced cracking at lower temperatures and narrowed the molecular weight (hydrocarbon) distribution in the crude oils. Chemical characterization of the crude oils indicated an increased gasoline-range fraction in oils obtained in the presence of catalyst while the distillate fractions were more evenly distributed among gasoline-range and diesel-range hydrocarbons in the absence of catalyst. The distillates obtained were characterized for fuel properties, elemental composition, boiling point, and molecular weight distribution. The fuel properties of the diesel-range distillate (diesel fraction) were comparable to those of ultralow sulfur diesel (ULSD).

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Cocracking Kinetics of PE/PP and PE/Hydrocarbon Mixtures (I) PE/PP Mixtures

Cited by 22 publications

References 27 publications

Co-pyrolysis of Mixed Plastics and Cellulose: An Interaction Study by Py-GC×GC/MS

Co-pyrolysis of Mixed Plastics and Cellulose: An Interaction Study by Py-GC×GC/MS

Thermal Cracking of Virgin and Waste Plastics of PP and LDPE in a Semibatch Reactor under Atmospheric Pressure

Catalytic Thermal Cracking of Postconsumer Waste Plastics to Fuels. 1. Kinetics and Optimization

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