Journal
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
Volume 155, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jaap.2021.105030
Keywords
Starch-based plastic bags; Pyrolysis; Heterogeneous acid catalyst; Building blocks; Chemical recycling
Funding
- Regione Emilia-Romagna (Bando Alte competenze per la ricerca e il trasferimento tecnologico -POR FSE)
- (Obiettivo tematico 10)
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Pyrolysis technology is explored for depolymerizing and charring starch-based plastic bags, providing a highly active and recyclable acid catalyst and highly pure terephthalic acid.
Pyrolysis was explored as a technology for depolymerizing and charring starch-based plastic bags in a novel valorization perspective based on a chemical recycling strategy, alternative to anaerobic digestion or composting. The char obtained from the thermal treatment (420?C for 15 h) was sulfonated to give a highly active and recyclable heterogeneous acid catalyst (10 wt% yield based on starch-based plastic bags subjected to pyrolysis), comparable in terms of catalytic activity and reusability to the analog catalyst prepared from potato starch and tested on a model esterification reaction. From pyrolysis liquid of starch-based plastic bags, highly pure terephthalic acid (4 wt% yield) was isolated through self-precipitation, whereas the remaining pyrolysis liquid produced (21 wt%) was solvent-fractionated to give a polar fraction (7 wt% yield) enriched in levoglucosan, and a less polar fraction (14 wt% yield) enriched in monobutenyl adipate and terephthalate.
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