Reclaiming .epsilon.-caprolactam from carpet waste

Details Reclaiming .epsilon.-caprolactam from carpet waste Reclaiming .epsilon.-caprolactam from carpet waste

1994-06-02

1996-09-17

Krass, Frederick

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Process of treating scrap or waste product containing solid...

521 405, 540540, C07D20112, C07D20116, C08J 1114

Patent

active

055568904

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.

REFERENCES:
patent: 4563308 (1986-01-01), Plantema et al.
patent: 5032684 (1991-07-01), Neubauer et al.
patent: 5169870 (1992-12-01), Corbin et al.
Abstract for German DD--75083, "Lactam Purification by Distillation, Hydrogenation, Concentration and Rectification".
J. Stresink & J. Mokry, Feasibility of Purifying 6-Caprolacctum by Hydrofining and Ion Exchange Resins, Petrochemica, 20(5/6) 171-177 (1980).

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