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November 23, 2020 08:02 AM

Audi explores chemical recycling of automotive plastics

Karen Laird
Editor, Sustainable Plastics
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    Audi

    A joint project between automaker Audi and the industrial resource strategies think tank at Karlsruhe Institute for Technology (KIT) is aimed at finding an alternative to energy recovery as an end-of-life solution for automotive plastic components that are not suitable for mechanical recycling.

    That work will focus on the many auto parts that are composed of more than one type of plastic, posing challenges for efficient mechanical recycling.

    “We want to establish smart circular systems in our supply chains and make efficient use of resources,” said Marco Philippi, senior director of procurement strategy for Audi, part of Volskwagen AG

    The new pilot project seeks to create smart circular systems for plastics, by establishing chemical recycling as a complementary technology to mechanical recycling, relegating incineration to the past.

    The technology is being evaluated at KIT by teams led by Dieter Stapf at the Institute for Technical Chemistry and Rebekka Volk at the Institute for Industrial Production. Audi supplies the end-of-life plastic components recovered from Audi models returning from the German dealership network, which are then chemically processed into pyrolysis oil, to serve as feedstock for the production of new raw materials.

    The technology enables a wider range of plastics to be recovered and conserves resources because fewer primary materials are required.

    Audi is one of the first automobile manufacturers to test this recycling method in a pilot project with plastics from automobile production.

    “Recycling automotive plastics has not been possible for many components so far. That is why we are doing pioneering work here together with Audi,” Stapf said, “If we want to close these loops, we need to develop suitable methods for this.”

    Audi

    Recycled PET bottles are used in the seat covers of the Audi A3 Sportback 40 TFSI e.

    Audi says it is planning to gradually increase the proportion of secondary materials in its models. It already uses PET in its Audi A3 model. PET, however, is easily separated from any other materials it is combined with, making it easier to recycle. In the Audi A3, for instance, three textile seat covers are available with a recycled material content of up to 89 percent.

    Currently, however, the seat covers are not made of 100 percent recyclable materials.

    “The challenge is the lower fabric, which is connected to the upper material with an adhesive. We are working on replacing this too with recyclable polyester,” said Ute Grönheim, who is responsible for textile materials development at Audi.

    “Our goal is to manufacture the seat cover completely from the same type of material so that it can be recycled. We’re not far from achieving this goal.”

    Going forward, the plan is to make all textile seat covers from recycled materials across all model ranges. Once technical feasibility has been successfully demonstrated, Audi plans to industrialize the technology and then progressively apply it to more and more components.

    This project is conducted by the Industrial Resource Strategies Thinktank, which the Baden-Württemberg state government, in collaboration with the industry and supported by academia, has established at KIT.

     

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