Method of purifying caprolactam

Details Method of purifying caprolactam Method of purifying caprolactam

1975-08-11

1977-04-12

Jiles, Henry R.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07D20116

Patent

active

040174824

ABSTRACT:
A method of simultaneously purifying crude caprolactams obtained from the Beckmann rearrangement of cyclohexanone oxime in oleum and the gas-phase rearrangement of cyclohexanone oxime in the presence of catalysts. The improvement consists in that the crude caprolactam obtained from the catalytic gas-phase rearrangement is added to the acid rearrangement mixture derived from the Beckmann rearrangement in oleum and the mixture is maintained at temperatures of from 100.degree. to 200.degree. C with thorough mixing, whereupon it is neutralized and worked up. Advantageously, the content of lactam in the catalytic gas-phase rearrangement is from 5 to 30% of the content of lactam in the acid rearrangement mixture obtained from the Beckmann rearrangement.

REFERENCES:
patent: 3210338 (1965-10-01), Huber et al.

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