Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 8, Issue 51, Pages 19051-19061Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.0c07317
Keywords
hydrothermal liquefaction; chemical recycling; depolymerization; circular economy; polymers
Categories
Funding
- European Union's Horizon 2020 research and innovation [764734]
- Aarhus University Centre for Circular Bioeconomy (CBIO)
- H2020 Societal Challenges Programme [764734] Funding Source: H2020 Societal Challenges Programme
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Synthetic polymers constitute one of the main carbon-containing wastes generated nowadays. In this study, combined hydrothermal liquefaction (co-HTL) is evaluated for 1:1 mixtures of Miscanthus giganteus and different synthetic polymers-including poly-acrylonitrile-butadiene-styrene (ABS), bisphenol-A-based epoxy resin, high-density polyethylene (HDPE), low-density polyethylene (LDPE), polyamide 6 (PA6), polyamide 6/6 (PA66), poly(ethylene terephthalate) (PET), polycarbonate (PC), polypropylene (PP), polystyrene (PS), and polyurethane foam (PUR)-using batch HTL at 350 degrees C. Based on oil yields and composition, a comprehensive discussion of observed interactions is presented. The results show that even though polyolefins do not depolymerize under these conditions, the oil products depict that these materials interact with miscanthus biocrude changing its composition. Bisphenol-Abased polymers as PC and epoxy resins both contribute to the formation of monomer-like structures in the biocrude. PET increases the presence of carboxyl groups, while polyamides and PUR increase significantly the oil yield, modifying the biocrude composition toward nitrogen-containing molecules. PUR co-HTL was found to increase oil, carbon, and energy yields, leading to process improvement when compared to pure miscanthus processing.
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