Key Findings
Toray Industries Inc. has developed a solvent-based recycling process capable of recovering polyphenylene sulfide (PPS) from automotive waste while maintaining a molecular weight, melting point, and crystallization temperature similar to virgin PPS. A preliminary lifecycle-analysis study indicates that PPS produced via this technology may reduce cradle-to-gate greenhouse gas emissions compared to virgin material production.
Technical Details
The process leverages the unique solubility characteristics of PPS to selectively recover the material in its polymer form. The technical workflow consists of the following steps:
- Dissolution: A proprietary solvent is used to dissolve PPS-containing waste materials.
- Separation: A solid-liquid separation step removes insoluble materials, including metal contaminants and glass fibers found in PPS composites.
- Recovery: The PPS is recovered through crystallization.
By avoiding the depolymerization and repolymerization required in chemical recycling, this solvent-based route is expected to provide substantial energy savings. Unlike conventional mechanical recycling, this method removes impurities without degrading the polymer structure.
Background & Context
PPS is a high-performance thermoplastic used extensively in automotive glass-fiber-reinforced components due to its thermal and mechanical properties. However, recycling is typically difficult due to impurity separation challenges and the risk of polymer degradation during mechanical processing. Toray developed this process to address demand driven by end-of-life vehicle regulations, such as those recently introduced in the E.U.
Significance & Outlook
Toray is currently verifying the continuous operation of the process and evaluating additional application-relevant properties. The company has identified three primary challenges for commercial-scale production: securing waste feedstock supplies, demonstrating large-scale continuous operation, and establishing customer acceptance for recycled PPS. Toray aims to begin commercial supply of the recycled PPS in 2030 and intends to explore the future reuse of recovered glass fibers.
Source: https://www.chemengonline.com/solvent-based-technology-recovers-pps-from-waste-materials/
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