Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Reduced-order condensed-phase kinetic models for polyethylene, polypropylene and polystyrene thermochemical recycling

Journal Article · · Chemical Engineering Journal

Thermochemical recycling of plastic waste (PW) into chemicals and energy vectors requires coupling particle and reactor-scale simulations to accurate condensed phase pyrolysis mechanisms for each constituent. This work proposes a methodology to derive reduced-order condensed-phase kinetic models from validated semi-detailed kinetic mechanisms. Two types of kinetic models are obtained for polyethylene (PE), polypropylene (PP) and polystyrene (PS): reduced semi-detailed models and multi-step fully lumped ones. These families offer different compromises between accuracy and computational cost. The former employ 50–100 gas + liquid species and describe both the radical degradation and the detailed carbon distribution of the products. Conversely, the latter involves 5–10 species per polymer tracking only the main petroleum cuts. The kinetic mechanisms are complemented by the definition of thermochemical properties of gas, liquid, and solid-phase species, accounting for phase-transitions through pseudo-chemical reactions. Model validations are performed by comparison with experimental data and the original semi-detailed mechanisms in terms of mass loss, heat fluxes and product distribution profiles. The resulting CHEMKIN-like condensed-phase models are attached as Supplementary Material and as a GitHub repository. Extending the proposed approach to other polymers and coupling it with existing subsets in the CRECK kinetic framework (e.g., biomass, PVC, PET) offers a powerful tool to model thermochemical recycling of PW and biomass/PW mixtures.

Research Organization:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy and Carbon Management (FECM)
OSTI ID:
2997939
Journal Information:
Chemical Engineering Journal, Journal Name: Chemical Engineering Journal Vol. 500; ISSN 1385-8947
Publisher:
Elsevier BVCopyright Statement
Country of Publication:
United States
Language:
English

References (150)

Mechanisms of thermal degradation of polystyrene, polymethacrylonitrile, and their copolymers on flash pyrolysis journal September 1998
Simultaneous long-chain branching and random scission: I. Monte Carlo simulation journal January 2001
Chemical recycling of mixed plastics of pyrolysis journal January 1995
Die Plancksche Theorie der Strahlung und die Theorie der spezifischen Wärme journal January 1907
A LaFeO3 supported natural‐clay‐mineral catalyst for efficient pyrolysis of polypropylene plastic material journal August 2021
Pyrolysis-molecular weight chromatography: A new on-line system for analysis of polymers. II. Thermal decomposition of polyolefins: Polyethylene, polypropylene, polyisobutylene journal August 1976
Pyrolysis of polypropylene for production of fuel‐range products: Effect of molecular weight of polypropylene journal March 2021
Reduced Kinetic Schemes of Complex Reaction Systems: Fossil and Biomass-Derived Transportation Fuels: REDUCED KINETIC SCHEMES OF COMPLEX REACTION SYSTEMS journal July 2014
THERM: Thermodynamic property estimation for gas phase radicals and molecules journal September 1991
Thermodynamic properties of polyethylene journal January 1962
Tacticity as a Factor Contributing to the Thermal Stability of Polystyrene journal December 2007
A Review of Modeling of Diffusion Controlled Polymerization Reactions journal May 2007
Thermal degradation of polystyrene and polyethylene. Part III journal February 1949
The kinetics of the thermal degradation of polystyrene and polyethylene journal September 1961
Thermal degradation of polystyrene: Effect of end groups derived from azobisisobutyronitrile journal January 1976
The thermal properties of polypropylene journal January 1984
Pyrolysis of polystyrene in a batch-type stirred vessel journal March 1999
Fire safety evaluation of expanded polystyrene foam by multi-scale methods journal October 2013
Behaviour of waste polypropylene pyrolysis char-based epoxy composite materials journal December 2019
Pyrolysis characteristics and thermal kinetics of expanded polystyrene (EPS) and styrene-methyl methacrylate (St-MMA) copolymer in LFC process journal November 2018
Reduction of detailed kinetic mechanisms for ignition and extinction of premixed hydrogen/air flames journal August 1996
Structural investigations on polyethylenes and ethylene-propylene copolymers by reaction gas chromatography and X-ray diffraction journal January 1968
Polymer reactions—Part VII: Thermal pyrolysis of polypropylene journal April 1980
Effects of zeolites on the pyrolysis of polypropylene journal January 1996
Study of the pyrolysis of polystyrenes journal May 1980
Study of the pyrolysis of polystyrenes journal June 1981
Pyrolysis of polypropylene journal September 1982
Pyrolysis of polypropylene journal June 1982
Evolution of the product yield with temperature and molecular weight in the pyrolysis of polystyrene journal March 1989
Molecular weight and pyrolysis products distribution of polymers journal November 1992
Thermogravimetric studies on the thermal decomposition of polyethylene journal April 1996
On the thermal treatment of plastic mixtures of MSW: Pyrolysis kinetics journal January 1993
Ab initio kinetics for pyrolysis and combustion systems book June 2019
Model reduction and lumping procedures book January 2019
Detailed mechanistic modeling of polymer degradation: application to polystyrene journal February 2001
Gasification of polystyrene as initial step in incineration, fires, or smoldering of plastics journal January 1998
Kinetic model reduction using genetic algorithms journal January 1998
Pyrolysis kinetics of γ-irradiated polypropylene journal January 2001
Thermo-mechanical degradation of polypropylene, low-density polyethylene and their 1:1 blend journal January 1998
Thermogravimetric evaluation of the kinetics of decomposition of polyolefin blends journal January 1998
Thermal degradation of polystyrene journal June 2001
Catalyst addition in polyethylene pyrolysis journal April 2001
Kinetics of pyrolysis of high density polyethylene. Comparison of isothermal and dynamic experiments journal December 2002
Thermal degradation of poly(vinyl chloride) journal December 2003
Kinetic study of polypropylene pyrolysis using ZSM-5 and an equilibrium fluid catalytic cracking catalyst journal August 2003
Kinetic modeling of the thermal degradation of polyethylene and polystyrene mixtures journal December 2003
Kinetic modeling of polyethylene and polypropylene thermal degradation journal May 1997
Gas product distribution from polyethylene pyrolysis journal September 1999
Classification of volatile products from the temperature-programmed pyrolysis of polypropylene (PP), atactic-polypropylene (APP) and thermogravimetrically derived kinetics of pyrolysis journal April 2002
Lumping procedures in detailed kinetic modeling of gasification, pyrolysis, partial oxidation and combustion of hydrocarbon mixtures journal January 2001
Recovery of high-valued products from styrene-based polymers through coprocessing: Experiments and mechanistic modeling journal February 1998
Pyrolysis characteristics of polystyrene and polypropylene in a stirred batch reactor journal March 2004
Two-stage pyrolysis of polystyrene: Pyrolysis oil as a source of fuels or benzene, toluene, ethylbenzene, and xylenes journal February 2020
Study on pyrolytic kinetics and behavior: The co-pyrolysis of microalgae and polypropylene journal September 2015
Characteristics and kinetics study of simultaneous pyrolysis of microalgae Chlorella vulgaris, wood and polypropylene through TGA journal November 2017
Master equation lumping for multi-well potential energy surfaces: A bridge between ab initio based rate constant calculations and large kinetic mechanisms journal October 2021
Maximizing light olefins and aromatics as high value base chemicals via single step catalytic conversion of plastic waste journal January 2022
Bayesian tuned kinetic Monte Carlo modeling of polystyrene pyrolysis: Unraveling the pathways to its monomer, dimers, and trimers formation journal January 2023
Coupled matrix-based Monte Carlo modeling for a mechanistic understanding of poly (methyl methacrylate) thermochemical recycling kinetics journal November 2023
A lumped kinetic model and experimental investigation of poly(ethylene terephthalate) condensed-phase pyrolysis journal November 2024
Kinetic study of high density polyethylene (HDPE) pyrolysis journal December 2010
Strategies for mechanism reduction for large hydrocarbons: n-heptane journal July 2008
Oxidation and combustion of the n-hexene isomers: A wide range kinetic modeling study journal December 2008
Skeletal mechanism reduction through species-targeted sensitivity analysis journal January 2016
Curve matching, a generalized framework for models/experiments comparison: An application to n- heptane combustion kinetic mechanisms journal June 2016
Coupling chemical lumping to data-driven optimization for the kinetic modeling of dimethoxymethane (DMM) combustion journal February 2024
Reaction mechanism reduction and optimisation for modelling aviation fuel oxidation using standard and hybrid genetic algorithms journal April 2006
Thermal degradation behaviors of polyethylene and polypropylene. Part I: Pyrolysis kinetics and mechanisms journal July 2010
Insights into pyrolysis and co-pyrolysis of biomass and polystyrene: Thermochemical behaviors, kinetics and evolved gas analysis journal October 2017
The pyrolysis of oak with polyethylene, polypropylene and polystyrene using fixed bed and stirred reactors and TGA instrument journal October 2021
Estimation of pure component properties journal December 2004
Estimation of pure component properties journal March 2007
Estimation of pure component properties journal July 2008
Modelling pyrolysis process for PP and HDPE inside thermogravimetric analyzer coupled with differential scanning calorimeter journal September 2021
A step-by-step model for pyrolysis kinetics of polyethylene in an autoclave under non-linear increase of temperature journal August 2004
Binary mixture pyrolysis of polypropylene and polystyrene: A modeling and experimental study journal June 2005
Theoretical prediction of product distribution of the pyrolysis of high density polyethylene journal October 2007
Detailed kinetic modeling of the thermal degradation of vinyl polymers journal March 2007
Thermal degradation of polyethylene modeled on tetracontane journal March 2008
Development of a microwave thermogravimetric analyzer and its application on polystyrene microwave pyrolysis kinetics journal March 2018
Isothermal fast pyrolysis kinetics of synthetic polymers using analytical Pyroprobe journal May 2019
Slow pyrolysis of polyethylene terephthalate: Online monitoring of gas production and quantitative analysis of waxy products journal September 2019
Modeling of polystyrene degradation using kinetic Monte Carlo journal October 2022
Towards a lumped approach for solid plastic waste gasification: Polystyrene pyrolysis journal May 2023
Tailored HZSM-5 catalyst modification via phosphorus impregnation and mesopore introduction for selective catalytic conversion of polypropylene into light olefins journal August 2024
Product distribution modelling in the thermal pyrolysis of high density polyethylene journal June 2007
A TG-FTIR investigation on the co-pyrolysis of the waste HDPE, PP, PS and PET under high heating conditions journal June 2020
Thermo-catalytic pyrolysis of polystyrene in the presence of zinc bulk catalysts journal September 2014
The chemistry of chemical recycling of solid plastic waste via pyrolysis and gasification: State-of-the-art, challenges, and future directions journal May 2021
Characterization of high-impact polystyrene by catalytic pyrolysis over Al-MCM-41: Study of the influence of the contact between polymer and catalyst journal October 2007
Detailed mechanistic modeling of high-density polyethylene pyrolysis: Low molecular weight product evolution journal May 2009
Further considerations of the sources of the volatiles from pyrolysis of polystyrene journal November 2009
Kinetic modelling of High Density PolyEthylene pyrolysis: Part 2. Reduction of existing detailed mechanism journal July 2012
Kinetic modelling of high density polyethylene pyrolysis: Part 1. Comparison of existing models journal August 2012
Molecular weight dependence and stereoselective chain cleavage during the early stages of the isotactic polypropylene pyrolysis journal September 2017
The influence of the recycling stress history on LDPE waste pyrolysis journal June 2020
A directed relation graph method for mechanism reduction journal January 2005
Numerical modeling of auto-ignition of isolated fuel droplets in microgravity journal January 2015
From theoretical reaction dynamics to chemical modeling of combustion journal January 2017
Automation of chemical kinetics: Status and challenges journal July 2022
A Thermal Degradation Study of Insulation Materials Extruded Polystyrene journal January 2014
Pyrolytic decomposition and model-free kinetics analysis of mixture of polypropylene (PP) and low-density polyethylene (LDPE) journal March 2009
Theory and practice in the thermoanalytical kinetics of complex processes: Application for the isothermal and non-isothermal thermal degradation of HDPE journal March 2010
Formal kinetics of polystyrene pyrolysis in non-oxidizing atmosphere journal November 2012
Pyrolysis of virgin and waste polypropylene and its mixtures with waste polyethylene and polystyrene journal January 2004
Process and technological aspects of municipal solid waste gasification. A review journal April 2012
The effect of slow pyrolysis on the conversion of packaging waste plastics (PE and PP) into fuel journal September 2018
Fuel production from waste polystyrene via pyrolysis: Kinetics and products distribution journal April 2019
Real time monitoring of slow pyrolysis of polyethylene terephthalate (PET) by different mass spectrometric techniques journal April 2020
Towards a lumped approach for solid plastic waste gasification: Polyethylene and polypropylene pyrolysis journal February 2023
Insight into Polyethylene and Polypropylene Pyrolysis: Global and Mechanistic Models journal April 2021
Progress and Outlook of Solar-Powered Biomass for Biorefineries: A Minireview journal November 2022
Reaction Mechanism Generator v3.0: Advances in Automatic Mechanism Generation journal May 2021
Unveiling Solvent Effects on β-Scissions through Metadynamics and Mean Force Integration journal July 2024
Tacticity Changes during Controlled Degradation of Polypropylene journal September 2021
Influence of the Intrinsic Nanocore Environment in a Pd-Metalated Porous Organic Polymer for Catalytic Biomass-Derived Furfural Upgrading journal September 2022
Recent Advances in the Photocatalytic Conversion of Biomass-Derived Furanic Compounds journal August 2021
Kinetics, Product Evolution, and Mechanism for the Pyrolysis of Typical Plastic Waste journal December 2021
Mathematical Modeling of Fast Biomass Pyrolysis and Bio-Oil Formation. Note I: Kinetic Mechanism of Biomass Pyrolysis journal March 2017
Pyrolysis of Polyethylene in a Fluidized Bed Reactor journal November 1994
Binary Interactions between High-Density Polyethylene and 4-(1-Naphthylmethyl)bibenzyl during Low-Pressure Pyrolysis journal January 2000
Tertiary Resource Recovery from Waste Polymers via Pyrolysis:  Neat and Binary Mixture Reactions of Polypropylene and Polystyrene journal October 2001
Modeling the Evolution of the Full Polystyrene Molecular Weight Distribution during Polystyrene Pyrolysis journal April 2003
Estimation of the Enthalpy of Vaporization and the Entropy of Vaporization for Pure Organic Compounds at 298.15 K and at Normal Boiling Temperature by a Group Contribution Method journal September 2005
Product Yields and Compositions in the Continuous Pyrolysis of High-Density Polyethylene in a Conical Spouted Bed Reactor journal April 2011
Lumping and Reduction of Detailed Kinetic Schemes: an Effective Coupling journal December 2013
Thermodynamics of the Liquid State journal April 1943
Influence of Gas-Phase Reactions on the Product Yields Obtained in the Pyrolysis of Polyethylene journal February 1997
Kinetics of the Low-Temperature Pyrolysis of Polyethene, Polypropene, and Polystyrene Modeling, Experimental Determination, and Comparison with Literature Models and Data journal June 1997
Characterization of Coke Formed in the Pyrolysis of Polyethylene journal December 1997
Recycling of Polyethene and Polypropene in a Novel Bench-Scale Rotating Cone Reactor by High-Temperature Pyrolysis journal May 1998
Polyethylene Pyrolysis:  Theory and Experiments for Molecular-Weight-Distribution Kinetics journal May 1998
The NIST Chemistry WebBook:  A Chemical Data Resource on the Internet journal September 2001
Mechanistic Modeling of Polymer Degradation:  A Comprehensive Study of Polystyrene journal August 2002
Mechanistic Modeling of Polymer Pyrolysis:  Polypropylene journal November 2003
Reexamination of the Pyrolysis of Polyethylene:  Data Needs, Free-Radical Mechanistic Considerations, and Thermochemical Kinetic Simulation of Initial Product-Forming Pathways journal December 2003
The Theory of Phase Transitions journal November 1936
Critical Evaluation of Thermochemical Properties of C 1 –C 4 Species: Updated Group-Contributions to Estimate Thermochemical Properties journal March 2015
Heat capacity and other thermodynamic properties of linear macromolecules. II. Polyethylene journal January 1981
Estimation of the Heat Capacities of Organic Liquids as a Function of Temperature using Group Additivity. I. Hydrocarbon Compounds journal May 1993
An automatic chemical lumping method for the reduction of large chemical kinetic mechanisms journal November 2008
Thermal Decomposition Characteristics of Critical Components in Solid Wastes journal January 2004
Plastic waste recycling is gaining momentum journal August 2023
Pyrolysis of polystyrene in coal tar and ethylene tar pitches journal January 2012
High loading rice husk green composites: Dimensional stability, tensile behavior and prediction, and combustion properties journal January 2019
Techno-Economic Evaluation of High Temperature Pyrolysis Processes for Mixed Plastic Waste journal March 1998
Pyrolysis Gas Chromatographic Characterization of Block Copolymers of Ordinary and Deuterated Styrenes journal June 1982
Simple pyrolysis of polystyrene into valuable chemicals journal June 2021
Multi-Scale Modeling of Plastic Waste Gasification: Opportunities and Challenges journal June 2022
Pyrolysis of Low Density Polyethylene: Kinetic Study Using TGA Data and ANN Prediction journal April 2020