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Evangelopoulos, PanagiotisORCID iD iconorcid.org/0000-0002-9949-6274
Publications (3 of 3) Show all publications
Shafaghat, H., Gulshan, S., Johansson, A.-C., Evangelopoulos, P. & Yang, W. (2022). Selective recycling of BTX hydrocarbons from electronic plastic wastes using catalytic fast pyrolysis. Applied Surface Science, 605, Article ID 154734.
Open this publication in new window or tab >>Selective recycling of BTX hydrocarbons from electronic plastic wastes using catalytic fast pyrolysis
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2022 (English)In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 605, article id 154734Article in journal (Refereed) Published
Abstract [en]

Non-catalytic and catalytic pyrolysis of two waste electrical and electronic equipment (WEEE) fractions, with two different copper contents (low- and medium-grade WEEE named as LGE and MGE, respectively), were performed using micro- and lab-scale pyrolyzers. This research aimed to fundamentally study the feasibility of chemical recycling of the WEEE fractions via pyrolysis process considering molecular interactions at the interfaces of catalyst active sites and WEEE pyrolyzates which significantly influence the chemical functionality of surface intermediates and catalysis by reorganizing the pyrolyzates near catalytic active sites forming reactive surface intermediates. Hence, Al2O3, TiO2, HBeta, HZSM-5 and spent FCC catalysts were used in in-situ micro-scale pyrolysis. Results indicated that HBeta and HZSM-5 zeolites were more suitable than other catalysts for selective production of aromatic hydrocarbons and BTX. High acidity and shape selectivity of zeotype surfaces make them attractive frameworks for catalytic pyrolysis processes aiming for light hydrocarbons like BTX. Meanwhile, the ex-situ pyrolysis of LGE and MGE were carried out using HZSM-5 in micro- and lab-scale pyrolyzers to investigate the effect of pyrolysis configuration on the BTX selectivity. Although the ex-situ pyrolysis resulted in higher formation of BTX from LGE, the in-situ configuration was more efficient to produce BTX from MGE. © 2022 The Author(s)

Place, publisher, year, edition, pages
Elsevier B.V., 2022
Keywords
BTX, Catalytic fast pyrolysis, Monoaromatic hydrocarbons, Selective recycling, WEEE, Zeolite solid acids, Alumina, Aluminum oxide, Aromatic hydrocarbons, Catalyst activity, Electronic Waste, Oscillators (electronic), Pyrolysis, Recycling, Titanium dioxide, Catalytic fast pyrolyse, Catalytic pyrolysis, Fast pyrolysis, Monoaromatic hydrocarbon, Pyrolyzers, Solid acid, Waste electrical and electronic equipment, Zeolite solid acid, Zeolites
National Category
Other Materials Engineering
Identifiers
urn:nbn:se:ri:diva-60149 (URN)10.1016/j.apsusc.2022.154734 (DOI)2-s2.0-85137170603 (Scopus ID)
Note

Funding details: Energimyndigheten, 51219-1; Funding text 1: This research was supported by the Swedish Energy Agency via the project number 51219-1. The authors would like to thank Boliden Rönnskär for providing the raw WEEE fractions for this research.

Available from: 2022-09-29 Created: 2022-09-29 Last updated: 2023-05-09Bibliographically approved
Evangelopoulos, P., Persson, H., Kantarelis, E. & Yang, W. (2020). Performance analysis and fate of bromine in a single screw reactor for pyrolysis of waste electrical and electronic equipment (WEEE). Process Safety and Environmental Protection, 143, 313-321
Open this publication in new window or tab >>Performance analysis and fate of bromine in a single screw reactor for pyrolysis of waste electrical and electronic equipment (WEEE)
2020 (English)In: Process Safety and Environmental Protection, ISSN 0957-5820, E-ISSN 1744-3598, Vol. 143, p. 313-321Article in journal (Refereed) Published
Abstract [en]

This study focuses on chemical recycling of plastics from waste electrical and electronic equipment (WEEE), which constitutes a problematic waste fraction due to the presence of brominated flame retardants. An auger reactor has been designed and used for this study. Real WEEE material provided by Stena Technoworld has been pyrolyzed under different temperature conditions. The performance of the reactor as well as other important parameters such as the fate of the bromine have been investigated and evaluated. The main outcome of this investigation is to simulate a continuous process, which can be useful for designing a full-scale industrial process. The mass balance results after performing thermal treatment at 400, 500, and 600 °C, showed a high gas yield (44 %wt) at the temperature of 600 °C, which energy content is enough to self-sustain the auger reactor. At the low temperature of 400 °C the oil production reaches its maximum yield as well as maximum concentration of bromine, corresponding to 0.5 wt% in the oil. Several valuable organic compounds have been detected in the oil composition, which can be used as precursors for feedstock recycling producing new plastics. © 2020 The Authors

Place, publisher, year, edition, pages
Institution of Chemical Engineers, 2020
Keywords
Auger reactor, BRFs, Feedstock recycling, Pyrolysis, Screw reactor, WEEE, Augers, Bromine, Chemical equipment, Elastomers, Electronic equipment, Flame retardants, Low temperature production, Petroleum industry, Plastic recycling, Temperature, Brominated flame retardants, Chemical recycling, Industrial processs, Maximum concentrations, Performance analysis, Temperature conditions, Waste electrical and electronic equipment, Electronic Waste
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-45606 (URN)10.1016/j.psep.2020.07.006 (DOI)2-s2.0-85087748329 (Scopus ID)
Note

Funding details: 36880-2; Funding text 1: The authors would like to acknowledge Shen Wu for constructing the auger reactor, which this experimental process has been used. Moreover, the authors would like to acknowledge Stena Technoword and Henrik Jilvero for providing the WEEE material and Swedish energy agenc y (Project number 36880-2 ) for funding this study.

Available from: 2020-08-14 Created: 2020-08-14 Last updated: 2021-11-30Bibliographically approved
Persson, H., Han, T., Sandström, L., Xia, W., Evangelopoulos, P. & Yang, W. (2018). Fractionation of liquid products from pyrolysis of lignocellulosic biomass by stepwise thermal treatment. Energy, 154, 346-351
Open this publication in new window or tab >>Fractionation of liquid products from pyrolysis of lignocellulosic biomass by stepwise thermal treatment
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2018 (English)In: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 154, p. 346-351Article in journal (Refereed) Published
Abstract [en]

The thermal properties of cellulose, hemicellulose and lignin can be utilized to improve the characteristics of pyrolysis liquids. In this study, a concept of stepwise pyrolysis to fractionate the liquid based on the thermal properties of the biomass constituents was investigated. Lignocellulosic biomass was thermally treated in two steps: 200–300 °C followed by 550 °C. Derived liquids were studied for GC/MS analysis, water content, acid concentration and a solvent extraction method. Pyrolytic liquid derived from 550 °C after treatment at lower temperatures have a higher relative composition of phenolic compounds compared to one-step pyrolysis (increased from 58 to 90% of GC/MS peak area). Also, compounds known to promote aging, such as acids and carbonyl compounds, are derived at lower temperatures which may suppress aging in the liquid derived downstream at 550 °C. For liquids derived at 550 °C, the total acid number was reduced from 125 in one-step treatment to 14 in two-step treatment. Overall, no significant difference in the total liquid yield (sum of the liquids derived in separated treatments) nor any variations in their collective composition compared to one-step treatment at 550 °C was observed, i.e. stepwise pyrolysis can be utilized for direct fractionation of pyrolytic vapors.

Keywords
Bio-oil, Biomass, Fractionation, Pyrolysis, Stepwise, Carbonyl compounds, Cellulose, Chemical analysis, Liquids, Solvent extraction, Thermodynamic properties, Acid concentrations, Bio oil, Biomass constituents, Lignocellulosic biomass, Phenolic compounds, Solvent extraction methods, Stepwise pyrolysis, concentration (composition), gas chromatography, mass spectrometry, phenolic compound, solvent
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-34001 (URN)10.1016/j.energy.2018.04.150 (DOI)2-s2.0-85046167007 (Scopus ID)
Note

Funding details: 33284-2, Energimyndigheten; Funding details: 39449-1, Energimyndigheten; Funding text: The authors would like to thank Energimyndigheten ( Swedish Energy Agency ) for funding this project (projects no 33284-2 and 39449-1 ).

Available from: 2018-07-03 Created: 2018-07-03 Last updated: 2023-05-25Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0002-9949-6274

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