Reclaiming .epsilon.-caprolactam from carpet waste
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United States of America Patent
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Sep 17, 1996
Grant Date -
N/A
app pub date -
Jun 2, 1994
filing date -
Jun 4, 1993
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Abstract
The present invention is for a method of preparing purified .epsilon.-caprolactam from carpet waste containing nylon-6. Contaminated .epsilon.-caprolactam is obtained by depolymerizing nylon-6 from carpet waste. A mixture of the contaminated .epsilon.-caprolactam and water is then hydrogenated in the presence of hydrogen and a hydrogenation catalyst in order to produce purified .epsilon.-caprolactam. The amount of contaminated .epsilon.-caprolactam in the mixture can be between 10 and 95% by weight.
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