Detailed mechanistic modeling of high-density polyethylene pyrolysis: Low molecular weight product evolution

Levine, Seth E.; Broadbelt, Linda J.

doi:10.1016/j.polymdegradstab.2009.01.031

Cited by 135 publications

(108 citation statements)

References 32 publications

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“…This approach has been found particularly useful to assess the homolytic character of bond scission for polyethylene [70], polypropylene [87], polystyrene, polybutadiene and polyisoprene [88] for which strong linear relationships were obtained. In an attempt to apply this approach here, we used the classical group additivity method to determine the reaction enthalpies of relevant pyrolysis initiation reactions, i.e., those leading to the initial thermal breakdown of the polymers (see Table S3).…”

Section: Structure-reactivity Relationshipmentioning

confidence: 99%

Structure-reactivity relationship in pyrolysis of plastics: A comparison with natural polymers

Larraín

Carrier

Radović

2017

Journal of Analytical and Applied Pyrolysis

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Highlights• Global activation energy depends on conversion in pyrolysis of all polymers.• Activation energy variability is proportional to chemical complexity of polymers.• An Evans-Polanyi relationship for initiation reactions of polymer pyrolysis is proposed. AbstractRecent advances in plastics recycling confirm the high potential of pyrolysis technologies to enhance recovery and selectivity rates. Modelling the kinetics of this complex process to stimulate scaling-up opportunities remains a major challenge.This study is an attempt to develop practical quantitative reactivity indices for the pyrolysis of natural and synthetic polymers. Representative samples from both categories (coal and pine vs. PET, PE and PMMA) were selected. Their weight loss during pyrolysis was determined experimentally and analyzed using judicious lumping procedures for its initiation, propagation and termination steps. The combined experimental and theoretical approach allowed us to determine apparent activation energies using the isoconversional Friedman method; and the use of Benson's group contribution method generated reaction enthalpies for the initiation reactions. Increasing activation energies with conversion in each case indicated that bond scission proceeds in order of increasing bond strength. The greater chemical complexity of natural polymers was reflected in the higher coefficients of variability for activation energy and wider ranges of reaction enthalpies. A structure-reactivity relationship based on the Evans-Polanyi theory was used to test the hypothesis that primary pyrolysis kinetics is controlled by cleavage of weakest chemical bonds. While the results show that this approach is promising, especially if confirmed by extension to a larger data set, they also suggest the need to compare the relative kinetic importance of initiation and propagation steps in the sequence of polymer pyrolysis reactions.

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Section: Structure-reactivity Relationshipmentioning

confidence: 99%

Structure-reactivity relationship in pyrolysis of plastics: A comparison with natural polymers

Larraín

Carrier

Radović

2017

Journal of Analytical and Applied Pyrolysis

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“…Thermal stability studies of polymers are a matter of great interest because of the technical and commercial importance of these materials [1][2][3][4][5] with the kinetic analysis of thermal degradation playing an important role in such studies [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. A reliable evaluation of the kinetic parameters permits a theoretical interpretation of the experimental data and provides a mathematical description needed to extrapolate the reaction behaviour to conditions different from the experimental ones [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Combined kinetic analysis of thermal degradation of polymeric materials under any thermal pathway

Jiménez

Pérez‐Maqueda

Criado

2009

Polymer Degradation and Stability

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Combined kinetic analysis has been applied for the first time to the thermal degradation of polymeric materials. The combined kinetic analysis allows the determination of the kinetic parameter from the simultaneous analysis of a set of experimental curves recorded under any thermal schedule. Besides, the method does not make any assumption about the kinetic model or activation energy and allows the analysis even when the process does not follow one of the ideal kinetic models already proposed in literature. In the present paper the kinetics of the thermal degradation of both polytetrafluoroethylene (PTFE) and polyethylene (PE) have been performed. It has been concluded, without previous assumptions on the kinetic model, that the thermal degradation of PTFE obeys a first order kinetic law, while the thermal degradation of PE follows a diffusion-controlled kinetic model.

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“…In addition, there was less amount of CO and CO 2 which shows that there was complete conversion of plastic to gas Broadbelt (2009) andKannan et al (2014). …”

Section: Gc Analysis For Pehd Gas Yield Distribution Productsmentioning

confidence: 98%

Studying and Evaluating Sustainable Materials for Converting Plastic Waste to Fuel

Abdelrahman¹,

Dosky²,

Mohamed³

et al. 2018

EER

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Gasification is one of the most important solutions for plastic waste management. We researched the conversion of plastic waste to fuel using sustainable material (Nano Clay) modified with Nano transition metals (TiO 2 , MnO, and ZnO). This was processed in a fix bed reactor design. After studying the reaction mechanism of the gasification process, we evaluated the optimize (reactor temperature, reaction time and feeding ratio of the modified catalyst) on the gasification process with its application for the modified catalyst on the degradation of polyethylene high density(PEHD), other waste plastic to fuel (CH 4 , H 2 , and other light component gasses). This method can be used as an important resource for renewable energy (like generating electricity and clean fuel), rather than waste for landfills and the incineration process which is the main source of CO 2 emissions.

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Detailed mechanistic modeling of high-density polyethylene pyrolysis: Low molecular weight product evolution

Cited by 135 publications

References 32 publications

Structure-reactivity relationship in pyrolysis of plastics: A comparison with natural polymers

Structure-reactivity relationship in pyrolysis of plastics: A comparison with natural polymers

Combined kinetic analysis of thermal degradation of polymeric materials under any thermal pathway

Studying and Evaluating Sustainable Materials for Converting Plastic Waste to Fuel

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