Synergistic torrefaction of plastic polymers and biomass
- Idaho National Laboratory
- ExxonMobil Technology and Engineering
This study investigates the synergistic torrefaction of biomass and plastics, a process that could improve bioenergy and circular energy production by utilizing the combined energy potentials of both materials. A thorough investigation into the thermochemical transformations that occur during the synergistic torrefaction process, from material preparation to the final characteristics of the torrefied product was undertaken. The study aimed to uncover the underlying synergies that contribute to improved energy content and stability, which could lead to diverse energy applications. Materials used included biomass (e.g., corn stover, loblolly pine) alongside plastics numbered #1–#7. Torrefaction was conducted at various temperatures of 200, 225, and 250 °C and the torrefied material along with the raw material were extruded to make composite filament. The torrefied material was chemically characterized (e.g., ultimate, proximate, higher heating value) while the filament was mechanically tested (e.g., shear force). The results showed a consistent decrease in mass yield with increased torrefaction temperature, with notable variations among different biomass-plastic combinations. PVC, in particular, exhibited significant degradation, with the release of HCl gas promoting synergistic effects at lower temperatures. Co-torrefaction of biomass with PVC and PP demonstrated synergistic mass yields, in that the torrefaction of the mixture was accelerated compared to the separated components, while other plastics PET, HDPE, LDPE, PS, and PC showed resilience to degradation. Mechanical testing indicated that the torrefaction process alters the strength and brittleness of the resulting materials, with implications for their application in bioenergy production and bio-renewable materials.
- Research Organization:
- Idaho National Laboratory (INL), Idaho Falls, ID (United States)
- Sponsoring Organization:
- USDOE Office of Nuclear Energy (NE); USDOE Office of Nuclear Energy (NE)
- Grant/Contract Number:
- AC07-05ID14517
- OSTI ID:
- 3013102
- Report Number(s):
- INL/JOU-24-80968
- Journal Information:
- Polymer Degradation and Stability, Journal Name: Polymer Degradation and Stability Journal Issue: NA Vol. 341
- Country of Publication:
- United States
- Language:
- English
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