Scientists Report Major Breakthrough in Textile Recycling

Scientists involved in a German‑funded project say they have achieved a notable step toward more effective textile recycling, potentially allowing used workwear to be turned into high‑performance fabrics.

New method recovers polyester from blended waste

The research effort, known as TheKey, reports that it can extract polyester’s core building blocks—terephthalic acid (TA) and ethylene glycol (EG)—from blended textile waste with a quality that meets industry standards. The recovered monomers can be used to produce new polyester, a material widely employed in workwear, protective clothing, and sports apparel.

Traditional mechanical recycling of polyester‑cotton blends often degrades the fibers, while chemical approaches risk material loss. TheKey’s process, developed under conditions that approximate large‑scale production, aims to avoid those drawbacks. According to the project’s documentation, the recovered polyester matches the specifications required for manufacturing PET fibers.

“We have now laid the foundation for producing high‑quality PET fibres from used textiles,” said Diana Wolf, manager of R&D in environmental and process engineering at project partner Mewa. The statement reflects confidence that the method could be integrated into existing manufacturing lines once further refinements are completed.

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Challenges remain for cotton recovery

While the polyester breakthrough is significant, the group acknowledges that cotton recovery from blended fabrics is still problematic. Existing techniques can separate cotton, but the resulting pulp does not yet meet the quality needed for direct reuse in standard cotton production streams. Researchers are working to improve the purity and strength of the cellulose pulp to make it suitable for new textile fibers.

By the project’s conclusion, the partners aim to deliver a fully circular solution for polyester‑cotton textiles, producing PET fibers from recovered polyester monomers and high‑quality cellulose pulp from cotton. Achieving this would bring the textile sector closer to a circular economy, reducing reliance on virgin raw materials.

TheKey consortium includes eight partners, ranging from textile service firms to university research institutes. Members such as JAKO, matterr, and the Research Institute for Textile and Clothing at Hochschule Niederrhein contribute expertise in textile technology, chemical engineering, and materials science. The Institute for Chemical and Thermal Process Engineering at Technische Universität Braunschweig and the Ifeu Institute for Energy and Environmental Research Heidelberg also play key roles.

In practice, the development could mean that a worksite’s discarded uniforms are not simply landfilled or down‑cycled into low‑grade fabric. Instead, they might reappear as fresh, high‑performing garments after a relatively straightforward processing step.

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The impact could be immediate.

The next phase of the project will focus on scaling the technology toward a continuous industrial process, improving robustness, reproducibility, and material recovery rates. Funding from the German federal Ministry for Research, Technology and Space supports these efforts, highlighting governmental interest in sustainable manufacturing.

As the group moves toward pilot‑scale trials, the broader industry will be watching closely. Successful commercialization could set a precedent for tackling other mixed‑material recycling challenges, potentially prompting similar initiatives across the global textile market.