Process for recovering and purifying caprolactam from an...

Details Process for recovering and purifying caprolactam from an... Process for recovering and purifying caprolactam from an...

2005-02-01

2005-02-01

Kifle, Bruck (Department: 1624)

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

Organic compounds

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

Reexamination Certificate

active

06849731

ABSTRACT:
Process for recovering caprolactam from a solution comprising caprolactam dissolved in an organic solvent, said process comprising:a) washing the solution with water or an aqueous alkaline solution, resulting in a washed solution comprising caprolactam and organic solvent and in a washing residue,b) evaporating organic solvent from the washed solution, resulting in caprolactam product,c) optionally, hydrogenating the caprolactam product,d) optionally, evaporating water from the caprolactam product,e) distilling the caprolactam product to recover caprolactam and a distillation residue,f) extracting the distillation residue with an organic solvent in the presence of water to obtain (i) an extract comprising caprolactam dissolved in organic solvent and (ii) an aqueous effluent, andg) recycling the extract to step a) or b).

REFERENCES:
patent: 2758991 (1956-08-01), Kretzers et al.
patent: 3761467 (1973-09-01), Williams
patent: 274111 (1988-07-01), None
patent: 98 41502 (1998-09-01), None
patent: 98 49140 (1998-11-01), None

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