If you like our site, mark us as a preferred source on Google — so you’ll see our articles more often in search!
★Mark us as a preferred sourceRecycling engineering plastics presents a complex challenge for the chemical and waste management industries. According to experts, the mechanical processes proven for packaging are not sufficient on their own. To successfully keep specialty materials used in the automotive industry and other technically demanding fields—such as compounded polyolefins, polyurethanes, and polyamides—in the loop, an intelligent combination of multiple complementary technologies is required.
Recycling Engineering Plastics: No Single Universal Solution
Unlike high-volume commodity plastics used in packaging, the composition of specialty plastics is tailored to unique, high-performance requirements. Standard plastics often fail to deliver the required performance in demanding areas like the automotive industry.
According to a recent study published in the prestigious U.S. scientific journal Accounts of Materials Research, bringing plastics from heterogeneous waste streams into the circular economy requires two fundamental things: scalable sorting processes and the right mix of recycling technologies. Dr. Bernhard von Vacano, head of the Plastics Circularity Research Program and lead author of the study, pointed out that there is no single, all-encompassing standard technology for engineering plastics. The goal in every case is to produce high-quality recycled materials and achieve a closed material loop using an intelligent technology mix adapted to the specific waste stream.
The Limits of Mechanical Recycling
The most common technology is mechanical recycling, where plastics are sorted, crushed, and melted. Although the process is highly energy-efficient, it only works optimally with clean and homogeneous waste streams—such as packaging waste containing large volumes of relatively pure polymers and few additives.
Strict quality and hygiene requirements can restrict the reuse of mechanically recycled materials in new products, especially packaging, even in this area. For engineering plastics, the situation is even more difficult: waste streams of adequate purity are quite scarce, and the products frequently contain very complex polymer compositions.
Solvent-Based Technology and Depolymerization for Complex Waste
For waste plastics with more complicated compositions, solvent-based recycling can provide a viable solution. In this process, a suitable solvent is used to selectively dissolve, separate, and clean a specific type of plastic. An excellent example is the recovery of polyamides from scrapped vehicles, which can then be reused to manufacture new components.
Another defining direction is depolymerization, where plastics are broken down into their basic building blocks and then put back together again. The innovative process called loopamid® focuses specifically on the textile-to-textile recycling of polyamide 6. Through this technology, waste textiles can be transformed back into polyamide fibers that meet the same high-quality standards as conventional polyamide 6. The first commercial-scale production facility for this process started operations in early 2025 at the Caojing site in Shanghai, China.
Thermochemical Processes: Pyrolysis and Gasification
For highly heterogeneous plastics that often end up in incineration plants, high-energy-demand thermochemical processes can offer an alternative:
-
Pyrolysis: The long polymer chains in plastics are broken down into short hydrocarbon chains, producing pyrolysis oil that serves as a raw material for the chemical industry.
-
Gasification: This process produces syngas, which can be deployed as a chemical feedstock in production.
The Key to Scaling Up: Effective Waste Management and Regulation
Executed pilot projects demonstrate that the recycling of polyurethanes and polyamides is technically feasible, and raw materials of virgin-equivalent quality can be recovered from waste plastics.
According to Dr. Jens Hamprecht, co-author of the publication and Vice President of the company’s Performance Materials division, two key conditions must be met to achieve large-scale investments and industrial-scale deployment. First, it is necessary to build effective waste management systems that keep plastics in the loop over the long term. Second, policymakers must establish clear and reliable regulatory frameworks that support recycling.
By conserving resources and reducing dependence on fossil raw materials, recycling is a fundamental pillar of the transformation towards a sustainable economy. Research by the global chemical company—which generated sales of around €60 billion in 2025 and employs nearly 95,000 people—highlights that a predictable regulatory policy framework can help position Europe as a leading hub for innovation, sustainable growth, and technological progress in the manufacturing industry.
Source and Reference:
