University of Utah

Separation of Nylon 66 (PA 66) From Automotive Shredder Residue (ASR) Plastics by Flotation

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Courtesy of University of Utah

Plastics are the most valuable component of the automotive shredder residue (ASR) waste material making up 30% of the total weight. One promising separation technique, which is able to selectively recover the plastics from ASR, is flotation. It has been demonstrated for a synthetic PA66/ABS/PC system that nylon 66 (PA 66) can be selectively separated by caustic treatment and addition of alcohol or sulfonamide promoters. Under such conditions the separation efficiency for PA 66 can even reach 100%. The high purity product should be suitable for reuse in many different industries.

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