Low-energy nanopurification for multilayer packaging recycling

Overview

The proposed low-energy nanopurification technology offers a novel solution for recycling multilayer snack packaging by recovering high-purity polyolefins. This process utilizes ceramic membranes to selectively dissolve and purify films, effectively separating high-molecular-weight polymer chains from low-molecular-weight contaminants. This innovative approach allows companies to recycle existing packaging materials without the need for redesign, making it a cost-effective and scalable option for the circular economy.

Technical specifications

Key features:

• Utilizes ceramic membranes for size-based separation of polymers
• Operates at low temperatures, reducing energy consumption and avoiding hazardous byproducts
• Modular design allows integration with current recycling operations
• Demonstrated removal of over 90% of low-molecular-weight contaminants while preserving polymer integrity
• Applicable to a variety of polymers, including PS, PVC, ABS, PE, and PP

The process incorporates a membrane dialysis step that requires significantly less solvent than conventional methods, concentrating inks, coatings, and residues for further processing. This allows for precise control over the final purity of the recovered polymers.

Technology readiness level

This nanopurification technology is at TRL 5, having been validated under representative conditions with real ceramic membranes. The next steps involve optimizing solvent use and operating parameters in pilot trials, with a roadmap for industrial scale-up being developed.