Chemical recycling of polyolefins waste materials using supercritical water

Maja Čolnik (Avtor), Petra Kotnik (Avtor), Željko Knez (Avtor), Mojca Škerget (Avtor)

Povzetek

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.

Ključne besede

polipropilen;superkritična voda;plastični odpadki;kemično recikliranje;polypropylene;polyolefins;supercritical water;plastics waste;chemical recycling;

Podatki

Jezik:	Angleški jezik
Leto izida:	2022
Tipologija:	1.01 - Izvirni znanstveni članek
Organizacija:	UM FKKT - Fakulteta za kemijo in kemijsko tehnologijo
Založnik:	MDPI
UDK:	66.02
COBISS:	126526723
ISSN:	2073-4360
Št. ogledov:	38
Št. prenosov:	1
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Slovenski jezik
Sekundarne ključne besede:	polipropilen;superkritična voda;plastični odpadki;kemično recikliranje;
Vrsta dela (COBISS):	Znanstveno delo
Strani:	18 str.
Letnik:	ǂVol. ǂ14
Zvezek:	ǂiss. ǂ20
Čas izdaje:	19 Oct. 2022
DOI:	10.3390/polym14204415
ID:	19945514