Multi-layer flexible packaging has historically been unrecyclable due to the inseparability of its component polymer layers. A new catalytic process from MIT changes that calculus.
The multi-layer problem
Multi-layer packaging accounts for approximately 25% of all plastic packaging by volume but close to 0% of mechanical recycling streams globally. This category is disproportionately represented in ocean-bound and mismanaged plastic waste streams.
The catalytic solution
The MIT team developed a tungsten-based catalyst that selectively breaks interlayer bonds at 250°C. In pilot trials, the process recovered 94% of the PET layer, 88% of the PE layer, and 91% of the aluminium foil layer from typical snack packaging.