AI Article Synopsis
- Polyurethane (PU) is a widely used plastic, and recovering its valuable components through chemical recycling is crucial for managing its waste.
- Acidolysis, specifically using dicarboxylic acid (DCA) vapor at lower temperatures (<150 °C), offers an effective way to recover polyol from PU waste without the issues seen in high-temperature methods.
- This green chemistry approach minimizes unwanted byproducts and simplifies the process, making it easier to scale up and apply to commercial PU foam waste.
Article Abstract
Polyurethane (PU) is the sixth most used plastic in the world. Because many PU derived materials are thermosets and the monomers are valuable, chemical recycling to recover the polyol component is the most viable pathway to utilizing postconsumer PU waste in a closed-loop fashion. Acidolysis is an effective method to recover polyol from PU waste. Previous studies of PU acidolysis rely on the use of dicarboxylic acid (DCA) in high temperature reactions (>200 °C) in the liquid phase and result in unwanted byproducts, high energy consumption, complex separations of excess organic acid, and an overall process that is difficult to scale up. In this work, we demonstrate selective PU acidolysis with DCA vapor to release polyol at temperatures below the melting points of the DCAs (<150 °C). Notably, acidolysis with DCA vapor adheres to the principles of green chemistry and prevents in part esterification of the polyol product, eliminating the need for additional hydrolysis/processing to obtain the desired product. The methodology was successfully applied to a commercial PU foam (PUF) postconsumer waste.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11025130 | PMC |
| http://dx.doi.org/10.1021/acsmacrolett.4c00008 | DOI Listing |
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