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Open AccessArticle

Assessment of Supercritical CO2 Extraction as a Method for Plastic Waste Decontamination

1
Sustainable Resource and Waste Management, TUHH—Hamburg University of Technology, Blohmstr., 15, 21079 Hamburg, Germany
2
Eurotechnica GmbH, An den Stücken 55, D-22941 Bargteheide, Germany
3
Polymer Consult Buchner GmbH, Dorfgrund 6, D-22397 Hamburg, Germany
*
Authors to whom correspondence should be addressed.
Polymers 2020, 12(6), 1347; https://doi.org/10.3390/polym12061347
Received: 23 May 2020 / Revised: 8 June 2020 / Accepted: 10 June 2020 / Published: 15 June 2020
(This article belongs to the Special Issue Polymer Recycling: Degradation, Processing, Applications)
Due to the lack of advanced methods to clean plastic waste from organic contaminants, this study aimed at evaluating supercritical extraction as a decontamination method. Oil-adhesive high-density polyethylene (HD-PE) oil containers were subjected to supercritical extraction using supercritical carbon dioxide. The extraction was conducted at 300 bar, applying various temperatures (i.e., 70, 80 and 90 °C). The study assessed the impact of temperature on the decontamination efficiency. The variation in the samples’ quality was first analyzed using near infrared (NIR) spectroscopy. An analysis of the content of polycyclic aromatic hydrocarbons (PAHs) was followed. Samples treated at 70 and 80 °C showed higher extraction efficiencies, in spite of the lower extraction temperatures. The NIR analysis showed that the plastic specimens did not experience degradation by the supercritical decontamination method. Moreover, the NIR spectra of the extracted oil showed the presence of a wide range of compounds, some of which are hazardous. This has been confirmed by a GC-MS analysis of the extracted oil. Based on the provided assessment, the quality of the decontaminated HD-PE plastic samples—from a contamination point of view—is enhanced in comparison to untreated samples. The level of PAHs contamination decreased to be within the allowed limits defined by the REACH regulation, and also met the specifications of the German Product Safety Committee. This study proved the effectiveness of the supercritical extraction using CO2 in extracting organic contaminants from plastics, while maintaining their quality. View Full-Text
Keywords: plastic waste; decontamination; supercritical extraction; polycyclic aromatic hydrocarbons plastic waste; decontamination; supercritical extraction; polycyclic aromatic hydrocarbons
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MDPI and ACS Style

Alassali, A.; Aboud, N.; Kuchta, K.; Jaeger, P.; Zeinolebadi, A. Assessment of Supercritical CO2 Extraction as a Method for Plastic Waste Decontamination. Polymers 2020, 12, 1347.

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