1. Superstructure optimization for management of low-density polyethylene plastic waste.
- Author
-
Hernández, Borja, Vlachos, Dionisios G., and Ierapetritou, Marianthi G.
- Subjects
PLASTIC scrap recycling ,LOW density polyethylene ,INDUSTRIAL efficiency ,PLASTIC scrap ,WASTE management ,GREENHOUSE gas mitigation ,HYDROFORMYLATION ,MARINE debris - Abstract
We introduce a systematic framework centered on superstructure optimization to identify the most efficient economic and environmentally friendly approach for managing plastic waste. Applying the proposed framework to low-density-polyethylene (LDPE) plastic waste, we determine that pyrolysis is the most profitable technology followed by hydroformylation to C4-C8 olefins, and the oligomerization of higher carbon olefins. Coupling the results with geographical information, the selected superstructure has the potential to improve the economics of plastic waste management by approximately $3 per kg
LDPE in countries like the United States. On the other hand, the lowest CO2 emission plastic waste management uses solvent-based recycling only when there is significant degradation during mechanical recycling. When plastic waste can be recycled mechanically more than five times, the emissions in mechanical recycling are lower. These technologies collectively contribute to emissions reductions ranging from 1.5 and 3 kgCO2eq . per kgLDPE , for mechanical and solvent-based recycling, respectively. [ABSTRACT FROM AUTHOR]- Published
- 2024
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