Biphasic molten salt system for converting bio-based packaging into platform chemicals

Overview

This technology offers a novel approach to chemical recycling of bio-based, compostable packaging materials such as aliphatic polyesters. The solution addresses a critical challenge in the circular plastics economy: converting used packaging back into high-value platform chemicals rather than landfill waste or low-grade fuels. By using a biphasic reaction system, the process enables selective depolymerization under mild conditions while preserving the quality of the resulting chemical products.

The approach supports sustainability goals for packaging manufacturers, brand owners, and chemical producers seeking alternatives to traditional mechanical recycling, which often degrades polymer quality. It also provides a pathway to recover valuable feedstocks from compostable plastics that currently lack established end-of-life recovery infrastructure.

Technical specifications

System design:

• A biphasic configuration combining an inorganic molten salt aqueous phase (bottom layer) with an organic extraction solvent phase (top layer)
• Compostable packaging dissolves and depolymerizes within the molten salt phase, potentially with co-catalysts to enhance reaction selectivity
• Formed platform chemicals migrate immediately into the organic phase due to favorable solubility, preventing over-decomposition or unwanted condensation reactions
• The organic solvent is recycled after product recovery, and the molten salt is regenerated for reuse

Process advantages:

• Operates under mild reaction conditions compared to conventional pyrolysis or gasification
• Targets production of platform chemicals and starting monomers rather than fuels, maximizing recovered value
• Designed for continuous or batch processing of flexible packaging formats

Technology readiness level

The technology is currently at an early-to-mid stage of development. The research team is actively validating the biphasic system through experimental demonstration over the next six to nine months, focusing on converting bio-based packaging back to starting materials and other high-value chemicals through chemical depolymerization in molten salt with or without co-catalysts. Further technical details and validation results will be disclosed under appropriate confidentiality arrangements. The approach is ready for collaborative partnerships to advance scale-up and application-specific optimization.