Method of recovering caprolactam from mixed waste

Details Method of recovering caprolactam from mixed waste Method of recovering caprolactam from mixed waste

1992-06-25

1993-08-31

Bond, Robert T.

Organic compounds -- part of the class 532-570 series

Organic compounds

Unsubstituted hydrocarbyl chain between the ring and the -c-...

540485, C07D20112, C07D20116

Patent

active

052410668

ABSTRACT:
A process for recovering caprolactam from waste containing both polycaprolactam and materials which are insoluble in acidic solvents for polycaprolactam includes agitating the waste in an acidic solvent capable of dissolving polycaprolactam without degrading the acid insoluble materials, separating the solution containing polycaprolactam from the acid insoluble materials, feeding the solution containing the polycaprolactam to a depolymerization reactor, without substantially precipitating the polycaprolactam and depolymerizing the polycaprolactam solution to obtain substantially pure caprolactam.

REFERENCES:
patent: 3317519 (1967-05-01), Lazarus et al.
Dmitrieva et al., "Regeneration of .epsilon.-Caprolactam From Wastes In the Manufacture of Polycaproamide Fibres and Yarns" Fibre Chemistry, Mar. 1986, pp. 229-241.

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