Cargando…

Chemical Recycling of Polyolefins Waste Materials Using Supercritical Water

In the following work, the hydrothermal degradation of polypropylene waste (PP) using supercritical water (SCW) has been studied. The procedure was carried out in a high-pressure, high-temperature batch reactor at 425 °C and 450 °C from 15 to 240 min. The results show a high yield of the oil (up to...

Descripción completa

Detalles Bibliográficos
Autores principales: Čolnik, Maja, Kotnik, Petra, Knez, Željko, Škerget, Mojca
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9609547/
https://www.ncbi.nlm.nih.gov/pubmed/36297994
http://dx.doi.org/10.3390/polym14204415
_version_ 1784819048436989952
author Čolnik, Maja
Kotnik, Petra
Knez, Željko
Škerget, Mojca
author_facet Čolnik, Maja
Kotnik, Petra
Knez, Željko
Škerget, Mojca
author_sort Čolnik, Maja
collection PubMed
description In the following work, the hydrothermal degradation of polypropylene waste (PP) using supercritical water (SCW) has been studied. The procedure was carried out in a high-pressure, high-temperature batch reactor at 425 °C and 450 °C from 15 to 240 min. The results show a high yield of the oil (up to 95%) and gas (up to 20%) phases. The gained oil phase was composed of alkanes, alkenes, cycloalkanes, aromatic hydrocarbons, and alcohols. Alkanes and alcohols predominated at 425 °C and shorter reaction times, while the content of aromatic hydrocarbons sharply increased at higher temperatures and times. The higher heating values (HHVs) of oil phases were in the range of liquid fuel (diesel, gasoline, crude and fuel oil), and they were between 48 and 42 MJ/kg. The gas phase contained light hydrocarbons (C(1)–C(6)), where propane was the most represented component. The results for PP degradation obtained in the present work were compared to the results of SCW degradation of colored PE waste, and the potential degradation mechanism of polyolefins waste in SCW is proposed. The results allowed to conclude that SCW processing technology represents a promising and eco-friendly tool for the liquefaction of polyolefin (PE and PP) waste into oil with a high conversion rate.
format Online
Article
Text
id pubmed-9609547
institution National Center for Biotechnology Information
language English
publishDate 2022
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-96095472022-10-28 Chemical Recycling of Polyolefins Waste Materials Using Supercritical Water Čolnik, Maja Kotnik, Petra Knez, Željko Škerget, Mojca Polymers (Basel) Article In the following work, the hydrothermal degradation of polypropylene waste (PP) using supercritical water (SCW) has been studied. The procedure was carried out in a high-pressure, high-temperature batch reactor at 425 °C and 450 °C from 15 to 240 min. The results show a high yield of the oil (up to 95%) and gas (up to 20%) phases. The gained oil phase was composed of alkanes, alkenes, cycloalkanes, aromatic hydrocarbons, and alcohols. Alkanes and alcohols predominated at 425 °C and shorter reaction times, while the content of aromatic hydrocarbons sharply increased at higher temperatures and times. The higher heating values (HHVs) of oil phases were in the range of liquid fuel (diesel, gasoline, crude and fuel oil), and they were between 48 and 42 MJ/kg. The gas phase contained light hydrocarbons (C(1)–C(6)), where propane was the most represented component. The results for PP degradation obtained in the present work were compared to the results of SCW degradation of colored PE waste, and the potential degradation mechanism of polyolefins waste in SCW is proposed. The results allowed to conclude that SCW processing technology represents a promising and eco-friendly tool for the liquefaction of polyolefin (PE and PP) waste into oil with a high conversion rate. MDPI 2022-10-19 /pmc/articles/PMC9609547/ /pubmed/36297994 http://dx.doi.org/10.3390/polym14204415 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Čolnik, Maja
Kotnik, Petra
Knez, Željko
Škerget, Mojca
Chemical Recycling of Polyolefins Waste Materials Using Supercritical Water
title Chemical Recycling of Polyolefins Waste Materials Using Supercritical Water
title_full Chemical Recycling of Polyolefins Waste Materials Using Supercritical Water
title_fullStr Chemical Recycling of Polyolefins Waste Materials Using Supercritical Water
title_full_unstemmed Chemical Recycling of Polyolefins Waste Materials Using Supercritical Water
title_short Chemical Recycling of Polyolefins Waste Materials Using Supercritical Water
title_sort chemical recycling of polyolefins waste materials using supercritical water
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9609547/
https://www.ncbi.nlm.nih.gov/pubmed/36297994
http://dx.doi.org/10.3390/polym14204415
work_keys_str_mv AT colnikmaja chemicalrecyclingofpolyolefinswastematerialsusingsupercriticalwater
AT kotnikpetra chemicalrecyclingofpolyolefinswastematerialsusingsupercriticalwater
AT knezzeljko chemicalrecyclingofpolyolefinswastematerialsusingsupercriticalwater
AT skergetmojca chemicalrecyclingofpolyolefinswastematerialsusingsupercriticalwater