Purification of caprolactam

Details Purification of caprolactam Purification of caprolactam

1980-06-17

1981-11-17

Bond, Robert T.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07D20116

Patent

active

043010733

ABSTRACT:
A process for purifying caprolactam, which has been obtained by a Beckmann rearrangement, by extracting crude caprolactam with solvents, distilling the extract in the presence of alkali, and isolating pure caprolactam, wherein, in a first stage, caprolactam is distilled from the alkaline distillation residue at a bottom temperature of 130.degree.-160.degree. C., and is recycled to the distillation stage, the residue thus obtained is distilled, in a second stage, at a bottom temperature of 140.degree.-180.degree. C., and the distillate is treated with strongly acidic agents in a third stage and is then recycled to the extraction stage.

REFERENCES:
patent: 3264064 (1966-08-01), Nieswandt et al.
patent: 3755305 (1973-08-01), Schwarz et al.
patent: 3912721 (1975-10-01), Mattone et al.
patent: 3914217 (1975-10-01), Smith
patent: 4148793 (1979-04-01), Danziger et al.
patent: 4154729 (1979-05-01), Fuchs et al.

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