Thermochemical recycling of end-of-life and virgin HDPE: A pilot-scale study

Abbas-Abadi, Mehrdad Seifali; Zayoud, Azd; Kusenberg, Marvin; Roosen, Martijn; Vermeire, Florence H.; Yazdani, Parviz; Waeyenberg, Jonathan Van; Eschenbacher, Andreas; Hernandez, Francisco Jose Arraez; Kuzmanović, Maja; Thi, Hang Dao; Kresovic, Uros; Sels, Bert F.; Puyvelde, Peter Van; Meester, Steven De; Saeys, Mark

doi:10.1016/j.jaap.2022.105614

Cited by 17 publications

(9 citation statements)

References 88 publications

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“…This sharp rise in the yield of condensable pyrolysis products can be mainly attributed to severe cracking of wax products as pyrolysis temperature is increased. 29,30 Figure 7 shows the pathways based on the major pyrolysis products observed in the primary decomposition of HDPE under the isothermal reaction-controlled regime. In the pyrolysis of HDPE, the primary routes in the formation of products are β-scission reactions.…”

Section: Validation Of Hdpe Pyrolysis Conditions Formentioning

confidence: 99%

Parametric Study of Polyethylene Primary Decomposition Using a Micropyrolyzer Coupled with Two-Dimensional Gas Chromatography

Jayarama Krishna,

Perez,

Toraman

2024

ACS Sustainable Chem. Eng.

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A deeper understanding of pyrolysis reaction pathways under an isothermal, reaction-controlled regime is essential for studying the kinetics and optimizing the design of pyrolysis reactors. This work methodically studied the effect of various pyrolysis variables on the product distribution of highdensity polyethylene (HDPE) to validate the pyrolysis conditions that minimize transport effects and secondary gas-phase reactions. The primary decomposition of HDPE was performed using a Box− Behnken design to evaluate the role of pyrolysis variables such as particle size, sample size, carrier gas flow rate, and temperature. Pyrolysis experiments used a micropyrolyzer connected to twodimensional chromatography with flame ionization and time-offlight spectrometer detectors (Py−GC × GC−FID/TOF−MS). Principal component analysis of pyrolysis data showed statistical differences in the yield of C 3 to C 28 hydrocarbons as the temperature varied between 480 and 600 °C. Furthermore, a larger sample size of 1000 μg resulted in a different product distribution compared to smaller sample sizes of 50−150 μg. At 600 °C, the yields of cyclodiolefins, cycloolefins, and aromatics increased by approximately 355, 67, and 62%, respectively, when the sample size was increased from 50 to 1000 μg, and the flow rate decreased from 100 to 50 mL min −1 .

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Section: Validation Of Hdpe Pyrolysis Conditions Formentioning

confidence: 99%

Parametric Study of Polyethylene Primary Decomposition Using a Micropyrolyzer Coupled with Two-Dimensional Gas Chromatography

Jayarama Krishna,

Perez,

Toraman

2024

ACS Sustainable Chem. Eng.

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“…Pyrolysis involves the thermal cracking of waste plastic into smaller molecules in gas, liquid, and wax forms with carbon chain length distributions of C2–C5, C5–C20, and C20–C60+, respectively. − These fractions are a mixture of both terminal and internal unsaturated and saturated hydrocarbons. , LDPE and HDPE are the most common types of PE. Due to the difference in the branching in the chemical structure, the behavior during the pyrolysis process is distinct.…”

Section: Introductionmentioning

confidence: 99%

“…For example, Abbas-Abadi et al. reported that 93.2 wt % of oil could be obtained after pyrolyzing HDPE at 0.1 bar, 464 °C . Arabiourrutia et al report that for the slow pyrolysis of HDPE at 430 °C the pyrolysis oil has a similar composition to vacuum gas oil, which is the common feedstock for fluid catalytic cracking units in refineries .…”

Section: Introductionmentioning

confidence: 99%

“…13−15 These fractions are a mixture of both terminal and internal unsaturated and saturated hydrocarbons. 16,17 LDPE and HDPE are the most common types of PE. Due to the difference in the branching in the chemical structure, the behavior during the pyrolysis process is distinct.…”

Section: ■ Introductionmentioning

confidence: 99%

“…For example, Abbas-Abadi et al reported that 93.2 wt % of oil could be obtained after pyrolyzing HDPE at 0.1 bar, 464 °C. 16 Arabiourrutia et al report that for the slow pyrolysis of HDPE at 430 °C the pyrolysis oil has a similar composition to vacuum gas oil, which is the common feedstock for fluid catalytic cracking units in refineries. 23 Overall, the pyrolytic process is currently the most promising chemical recycling process, which also opens up the possibility for the petrochemical industry to step in.…”

Section: ■ Introductionmentioning

confidence: 99%

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Production of Long Chain Alcohols from Waste Polyethylene Pyrolysis Oil Using a One-Pot Hydroboration–Oxidation Process

Bui

Pazdur

Janssens

et al. 2023

ACS Sustainable Chem. Eng.

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We provide a new method to source fatty alcohols from poly(ethylene) (PE) pyrolysis oil. To this end, we have developed a new one-pot process to obtain fatty alcohols from a mixture of long chain alkenes and alkanes (C10–C20) that is obtained from pyrolyzed PE. Hydroboration–oxidation methods with and without an isomerization step were investigated for converting all types of alkenes present in the PE pyrolysis oil to primary alcohols only, following the anti-Markovnikov rule. Our process showed 91%–98% conversion of the alkenes to alcohols in a one-pot reaction at a scale of 50 g at low temperature (10–25 °C) under ambient pressure. In addition, the efficiency of the process was confirmed by testing several types of pyrolysis oil derived from commercial waste PE where alcohol recovery reached 83%–92% based on the amount of alkenes in the PE pyrolysis oil. As fatty alcohols are commodity chemicals, our study can pave the way for converting waste plastics into high value chemicals, a welcome energy and materials saving shortcut to the specialty chemicals market.

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Interactions of operating parameters on the production of waste polypropylene pyrolysis oil: neural fuzzy model and genetic algorithm optimization

Pan

Martins²,

Debenest³

2022

J Mater Cycles Waste Manag

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Thermochemical recycling of end-of-life and virgin HDPE: A pilot-scale study

Cited by 17 publications

References 88 publications

Parametric Study of Polyethylene Primary Decomposition Using a Micropyrolyzer Coupled with Two-Dimensional Gas Chromatography

Parametric Study of Polyethylene Primary Decomposition Using a Micropyrolyzer Coupled with Two-Dimensional Gas Chromatography

Production of Long Chain Alcohols from Waste Polyethylene Pyrolysis Oil Using a One-Pot Hydroboration–Oxidation Process

Interactions of operating parameters on the production of waste polypropylene pyrolysis oil: neural fuzzy model and genetic algorithm optimization

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