Continuous Chemical Recycling of Polyurethane Technology

This whitepaper presents the development and implementation of continuous chemical recycling technology for polyurethane (PU), specifically focusing on the glycolysis process utilized in a co-rotating twin-screw extruder. The technology aims to convert end-of-life rigid PU foam from refrigeration appliances into recycled polyol (rPolyol), which can be reintegrated into polyurethane systems. The document outlines the challenges faced in recycling PU, including the presence of contaminants and the need for closed-loop systems. It details the process methodology, including the feeding of powdered PU into the extruder, the introduction of a depolymerization agent, and the importance of controlling residence time to optimize depolymerization performance. Additionally, the paper discusses the advantages of continuous processing over batch methods, particularly in handling contaminated waste streams. The findings indicate that the technology supports sustainable practices and aligns with circular economy objectives, providing a viable solution for large-scale PU recycling.