Invention Reference Number
This technology enables the conversion of polyethylene waste into liquid hydrocarbon products under mild conditions without external hydrogen, solvents, or metal catalysts. The process addresses limitations of conventional plastic recycling by producing liquid alkanes suitable for downstream use while avoiding complex feedstocks and high-severity operating conditions. By leveraging a robust reaction medium with intrinsic catalytic activity, the approach offers a practical pathway for transforming difficult-to-recycle plastics into value-added chemical products using simplified processing steps.
Description
Oak Ridge National Laboratory has developed a one-pot process that converts polyethylene into liquid alkane products using a molten reaction medium that simultaneously functions as a catalyst and solvent. The system operates under neat conditions at relatively low temperatures and does not require external hydrogen sources, added solvents, or precious or transition metal catalysts.
The reaction environment provides highly active acidic sites within a stable, ionic medium that promotes controlled carbon–carbon bond rearrangement while suppressing excessive degradation. This enables the selective formation of liquid hydrocarbons across gasoline- and diesel-range fractions. The approach has demonstrated effectiveness not only for conventional polyethylene but also for more structurally robust and high-molecular-weight plastic materials, which are typically challenging to process using existing chemical recycling methods.
Spectroscopic and modeling studies indicate that the reaction proceeds through repeated transformation steps within the molten medium, allowing continuous conversion of polymer chains into smaller, stabilized hydrocarbon products. The simplicity of the system and its compatibility with commercially available materials make it attractive for industrial adaptation while maintaining process control and product selectivity.
Benefits
- Converts polyethylene into liquid hydrocarbon products without external hydrogen
- Operates under mild temperatures and solvent-free conditions
- Avoids the use of noble or transition metal catalysts
- Capable of processing high-molecular-weight and difficult plastic feedstocks
Applications and Industries
- Plastic waste processing and materials recovery
- Chemical manufacturing and hydrocarbon upgrading
- Polymer and specialty chemical industries
- Industrial waste conversion operations
Contact
To learn more about this technology, email partnerships@ornl.gov or call 865-574-1051.
