20.500.12556/DKUM-85896 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 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 (C1–C6), 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. polypropylene polyolefins supercritical water plastics waste chemical recycling polipropilen superkritična voda plastični odpadki kemično recikliranje true false true MDPI Angleški jezik Slovenski jezik https://www.mdpi.com/journal/polymers © 2022 by the authors Znanstveno delo 2023-09-18 12:47:04 2023-09-18 12:47:04 2025-05-13 12:19:25 0000-00-00 00:00:00 2022 0 0 18 str. Št. 20, številka članka 4415 Letn. 14 19 Oct. 2022 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2022-09-13 2022-10-16 2022-10-19 66.02 126526723 10.3390/polym14204415 2073-4360 Chemical_Recycling_of_Polyolefins-Colnik-2022.pdf Chemical_Recycling_of_Polyolefins-Colnik-2022.pdf 1 0D3893891A636E9A4F2C302C9A068E90 4b10116a94b606c5b372fd0c18576950fe67b3672512d92b24cd6fe7eb64f5ae d6dbe26d-5611-11ee-86d1-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=172439 https://www.mdpi.com/2073-4360/14/20/4415 0 de30208f-5611-11ee-86d1-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=172440 Fakulteta za kemijo in kemijsko tehnologijo Medicinska fakulteta 0 0 0