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...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-10-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/14/20/4415 |
| _version_ | 1797470148420960256 |
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| author | Maja Čolnik Petra Kotnik Željko Knez Mojca Škerget |
| author_facet | Maja Čolnik Petra Kotnik Željko Knez Mojca Škerget |
| author_sort | Maja Čolnik |
| collection | DOAJ |
| 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<sub>1</sub>–C<sub>6</sub>), 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. |
| first_indexed | 2024-03-09T19:32:38Z |
| format | Article |
| id | doaj.art-642dcaf88d1e4c0e9eccc785c3f36480 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-09T19:32:38Z |
| publishDate | 2022-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-642dcaf88d1e4c0e9eccc785c3f364802023-11-24T02:09:03ZengMDPI AGPolymers2073-43602022-10-011420441510.3390/polym14204415Chemical Recycling of Polyolefins Waste Materials Using Supercritical WaterMaja Čolnik0Petra Kotnik1Željko Knez2Mojca Škerget3Laboratory for Separation Processes and Product Design, Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova 17, SI-2000 Maribor, SloveniaLaboratory for Separation Processes and Product Design, Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova 17, SI-2000 Maribor, SloveniaLaboratory for Separation Processes and Product Design, Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova 17, SI-2000 Maribor, SloveniaLaboratory for Separation Processes and Product Design, Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova 17, SI-2000 Maribor, SloveniaIn 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<sub>1</sub>–C<sub>6</sub>), 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.https://www.mdpi.com/2073-4360/14/20/4415polypropylenepolyolefinssupercritical waterplastics wastechemical recycling |
| spellingShingle | Maja Čolnik Petra Kotnik Željko Knez Mojca Škerget Chemical Recycling of Polyolefins Waste Materials Using Supercritical Water Polymers polypropylene polyolefins supercritical water plastics waste chemical recycling |
| 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 | polypropylene polyolefins supercritical water plastics waste chemical recycling |
| url | https://www.mdpi.com/2073-4360/14/20/4415 |
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