4.4 Article

PET pyrolysis and hydrolysis mechanism in the fixed pyrolyzer

Related references

Note: Only part of the references are listed.
Article Engineering, Chemical

Catalytic Pyrolysis of Poly(ethylene terephthalate) withMolybdenum Oxides for the Production of Olefins and TerephthalicAcid

Junhong Liu et al.

Summary: A molybdenum oxide catalyst was used to catalytically convert PET into olefins and TPA in a H2 atmosphere. The catalyst effectively promoted the cleavage of PET molecules and the production of olefins and aromatic products. Vinyl ester was found to be a crucial intermediate in the formation of olefins, and the catalyst facilitated the hydrogenation and conversion of the ester groups to produce olefins and TPA.

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH (2022)

Article Engineering, Environmental

Reforming of tar model compounds over sustainable and low-cost biochar: Special focus on spontaneous gasification reactivity and tar reforming kinetics for reformer design

Yen-Hau Chen et al.

Summary: This study evaluated the spontaneous gasification and catalytic activity of wood char in simulated sorption enhanced gasification environments, investigating the impact of hydrogen on tar-reforming performance. The results showed that spontaneous gasification during tar surrogates reforming led to the catalytic deactivation of wood char. By considering gasification-caused deactivation, the carbon conversion was used as a variable to modify the kinetic equations of the tar surrogates reforming.

CHEMICAL ENGINEERING JOURNAL (2021)

Article Engineering, Environmental

Upcycling of waste teabags via catalytic pyrolysis in carbon dioxide over HZSM-11

Soosan Kim et al.

Summary: The study explores the effects of CO2 and HZSM-11 catalyst on the pyrolytic products of waste teabags, showing that their synergistic use enhances the production of caprolactam, a value-added nylon monomer. The conversion of CO2 into CO during catalytic pyrolysis was greater compared to non-catalytic pyrolysis, highlighting the potential of upcycling everyday waste such as waste teabags through the synergistic employment of HZSM-11 catalyst and CO2 pyrolysis medium.

CHEMICAL ENGINEERING JOURNAL (2021)

Article Environmental Sciences

Dynamic flow and pollution of antimony from polyethylene terephthalate (PET) fibers in China

Jianwen Chu et al.

Summary: The study on the material flow of PET fibers in China reveals that the manufacturing stage is the main source of Sb release, improper disposal of waste fibers results in high Sb release, and there is a clear relationship between anthropogenic Sb and industrial intensity. Proper management of Sb in PET fibers is necessary to prevent widespread dispersion in the environment.

SCIENCE OF THE TOTAL ENVIRONMENT (2021)

Article Thermodynamics

Species transport and reaction characteristics between gas and solid phases for ex-situ catalytic pyrolysis of biomass

Yuchun Zhang et al.

Summary: This study proposed a novel ex-situ catalytic pyrolysis method for biomass, which simultaneously reacts and separates to increase product yield and reduce carbon residue. By optimizing parameters, the yield ratio of bio-oil can reach 54.2%, providing a theoretical basis for improving biomass high-value utilization technology.

ENERGY (2021)

Article Energy & Fuels

Thermogravimetric analysis of hazardous waste: Pet-coke, by kinetic models and Artificial neural network modeling

Sathiya S. P. Prabhakaran et al.

Summary: Pet coke is a hazardous waste obtained from petroleum refinery, with low reactivity and predominantly inorganic composition. The study provides reliable kinetic parameters for scale up and utilization of pet coke.
Article Physics, Applied

Pyrolysis behaviors of polyethylene terephthalate (PET): A density functional study

Jiawei Zhang et al.

Summary: This study investigates the pyrolysis mechanism of PET using DFT, revealing that the C-C bond between two carboxyl groups and the single bond between carboxyl group and carbon atom are the weakest in PET. The energy barriers for releasing CO2 are stable, while those for CO fluctuate. Proposed reaction paths for the formation of cyclic compounds are also discussed.

INTERNATIONAL JOURNAL OF MODERN PHYSICS B (2021)

Article Green & Sustainable Science & Technology

Numerical investigation of co-gasification of coal and PET in a fluidized bed reactor

Shaohua Du et al.

Summary: The study focuses on the co-gasification of PET and coal in a fluidized bed reactor, taking into account variations in particle size, density, and devolatilization reaction rate modification. The model's effectiveness is verified by comparing simulation results with experimental data. Furthermore, the study discusses the impacts of inlet gas velocity, solid feed position, and initial particle size on hydrodynamics and co-gasification reaction.

RENEWABLE ENERGY (2021)

Review Chemistry, Multidisciplinary

The Chemical Recycling of Polyesters for a Circular Plastics Economy: Challenges and Emerging Opportunities

Jack Payne et al.

Summary: Plastics have been crucial in human development, but increasing environmental concerns have raised public scrutiny and calls for bans. This has led to the development of renewable alternatives and new waste management strategies, with a focus on catalytic chemical recycling of poly(lactic acid) (PLA) and poly(ethylene terephthalate) (PET). The emergence of new materials has the potential to modernize the plastics economy, but industrial feasibility and challenges remain.

CHEMSUSCHEM (2021)

Article Thermodynamics

Insights into evolution mechanism of PAHs in coal thermal conversion: A combined experimental and DFT study

Yi-Feng Chen et al.

Summary: The evolution mechanism and energy conversion of volatile in low-rank coal with pyrolysis temperatures are still unclear. Experimental results and theoretical calculations reveal the complex correlation between volatiles and coal structure at different pyrolysis temperatures, with kinetic rate coefficients of the rate-limiting step successfully computed. Thermodynamic and kinetic calculations show that phenols pyrolysis have to overcome a higher energy barrier, and a hydrogen-rich environment can kinetically facilitate the formation of polycyclic aromatic hydrocarbons.

ENERGY (2021)

Article Polymer Science

Ultrafast microwave assisted recycling of PET to a family of functional precursors and materials

Eva Backstrorm et al.

Summary: A series of terephthalamides were successfully produced by rapid catalyst-free microwave-assisted aminolysis of polyethylene terephthalate (PET), which were further utilized for fabrication of plastic films or as plasticizers for polylactide (PLA). The study demonstrated that chemical recycling of PET by aminolysis is a viable and versatile option, producing valuable chemical compounds for material applications.

EUROPEAN POLYMER JOURNAL (2021)

Article Biochemistry & Molecular Biology

Analytical methods for the investigation of enzyme-catalyzed degradation of polyethylene terephthalate

Valentina Pirillo et al.

Summary: The study focuses on the persistent pollution concerns of PET plastic in global ecosystems and the enzymatic degradation research, including kinetic analysis of enzymes and methods study, providing important information for biologically recycling PET waste products.

FEBS JOURNAL (2021)

Article Polymer Science

Poly (4-styrenesulfonic acid): A recoverable and reusable catalyst for acid hydrolysis of polyethylene terephthalate

Hossein Abedsoltan et al.

Summary: Poly (4-styrenesulfonic acid) (PSSA) was utilized as a recoverable acid catalyst for hydrolysis of polyethylene terephthalate (PET) to terephthalic acid (TPA) and ethylene glycol (EG). The PSSA system exhibited faster hydrolysis kinetics than H2SO4 with better surface wetting of PET and higher localized concentration of protons. Reutilization and titration results indicated that PSSA maintained activity after five reaction cycles.

POLYMER (2021)

Review Thermodynamics

Co-pyrolysis of waste plastic and solid biomass for synergistic production of biofuels and chemicals-A review

Zhiwei Wang et al.

Summary: The study focuses on co-pyrolysis of waste plastic and solid biomass mixtures, which can provide synergistic enhancement for fuels and value-added products, and foster eco-friendly pathways for waste management and sustainability. The paper discusses the properties of different feedstocks and experimental methods for co-pyrolysis, as well as characteristics of co-pyrolysis reactors and catalytic methods.

PROGRESS IN ENERGY AND COMBUSTION SCIENCE (2021)

Review Engineering, Multidisciplinary

Composite materials based on recycled polyethylene terephthalate and their properties - A comprehensive review

Ashwani Kumar Singh et al.

Summary: Composite materials based on RPET as matrix material are cost effective, environmentally friendly, reducing consumption of virgin materials and addressing environmental pollution concerns. Various efforts have been made to explore the influence of different reinforcing materials and blending of RPET with various virgin polymers on the properties of composite materials based on RPET.

COMPOSITES PART B-ENGINEERING (2021)

Article Energy & Fuels

In line upgrading of biomass fast pyrolysis products using low-cost catalysts

Enara Fernandez et al.

Summary: This study explored biomass pyrolysis and the in-line catalytic cracking of the pyrolysis volatile stream. Different catalysts were found to promote different reaction pathways and product distributions during the cracking process, and methods to make the volatile stream suitable for further catalytic conversion for the production of hydrogen, fuels, and chemicals were identified.
Article Environmental Sciences

Enzymatic degradation of polyethylene terephthalate nanoplastics analyzed in real time by isothermal titration calorimetry

Kristina Vogel et al.

Summary: Plastics waste poses adverse effects on ecosystems and human health when not properly managed. Current research focuses on microbial or enzymatic degradation of microplastics, while using isothermal titration calorimetry in combination with thermokinetic models for in-depth analysis of degradation processes. The new method allows quantification of enzymatic and microbial adsorption to nanoparticles in simulated aquatic conditions.

SCIENCE OF THE TOTAL ENVIRONMENT (2021)

Article Engineering, Environmental

Polyethylene terephthalate (PET) recycling via steam gasification - The effect of operating conditions on gas and tar composition

Shouzhuang Li et al.

Summary: Polyethylene terephthalate (PET) is commonly used in textile fiber, film, and bottles. PET waste gasification can produce high concentrations of CO2 and biphenyl, and adjusting gasifying agents, temperature, residence time, and steam/fuel ratio can affect the product composition.

WASTE MANAGEMENT (2021)

Article Chemistry, Multidisciplinary

Synergistic catalysis of imidazole acetate ionic liquids for the methanolysis of spiral poly(ethylene 2,5-furandicarboxylate) under a mild condition

Xiaoling Qu et al.

Summary: In this study, metal-free tetrabutylphosphonium-based ionic liquids were used as catalysts for the methanolysis of the polyester PEF, achieving nearly 100% PEF degradation and a 77.6% DMFD yield under optimized conditions. By adjusting the structures of the ILs, the [BMIm][OAc] showed excellent catalytic activity. Furthermore, a synergetic catalytic mechanism of [BMIm][OAc] for the methanolysis of PEF was proposed based on experimental results and theoretical calculations.

GREEN CHEMISTRY (2021)

Article Chemistry, Multidisciplinary

Low-energy catalytic methanolysis of poly(ethyleneterephthalate)

Duong Dinh Pham et al.

Summary: In this study, a low-energy catalytic route for methanolysis to convert PET resin to DMT was developed, achieving high DMT selectivity at ambient temperature by controlling the moisture level. The PET depolymerization apparently proceeded through two series of reaction steps, and the degradation of PET had a relatively low activation energy of 66.5 kJ mol(-1), which was accountable for catalytic methanolysis of PET at ambient conditions.

GREEN CHEMISTRY (2021)

Article Chemistry, Multidisciplinary

Polyethylene Terephthalate Deconstruction Catalyzed by a Carbon-Supported Single-Site Molybdenum-Dioxo Complex

Yosi Kratish et al.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2020)

Review Environmental Sciences

Recent advances in biocatalysts engineering for polyethylene terephthalate plastic waste green recycling

Nadia A. Samak et al.

ENVIRONMENT INTERNATIONAL (2020)

Article Engineering, Environmental

Gas-phase treatment of polyethylene terephthalate waste in nitrating atmosphere for recycling purposes

S. A. Kulyukhin et al.

JOURNAL OF HAZARDOUS MATERIALS (2020)

Article Chemistry, Multidisciplinary

Degradation of poly(ethylene terephthalate) catalyzed by metal-free choline-based ionic liquids

Yachan Liu et al.

GREEN CHEMISTRY (2020)

Review Polymer Science

Organocatalysis for depolymerisation

Coralie Jehanno et al.

POLYMER CHEMISTRY (2019)

Article Engineering, Chemical

Operating Conditions for the Pyrolysis of Poly-(ethylene terephthalate) in a Conical Spouted-Bed Reactor

Maite Artetxe et al.

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH (2010)

Article Polymer Science

Hydrolysis of poly(ethylene terephthalate) in a fluidised bed reactor

G Grause et al.

POLYMER DEGRADATION AND STABILITY (2004)