Process for the purification of raw caprolactam

Details Process for the purification of raw caprolactam Process for the purification of raw caprolactam

1980-11-03

1982-05-04

Bond, Robert T.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07D20116

Patent

active

043281540

ABSTRACT:
A process for the purification of raw caprolactam obtained by extraction h alkylated phenols from its sulphuric solution, re-extraction with water, oxidation preferably with KMnO.sub.4, evaporation of water and distillation, comprises, before the oxidation treatment, a "fast distillation", in the presence of an alkali. The oxidation is conducted at 0.degree.-80.degree. C. and at atmospheric pressure with 0.005-0.5% by weight of KMnO.sub.4. The amount of alkali (NaOH) used in the fast distillation is comprised between 0.05 and 0.5% by weight.

REFERENCES:
patent: 3145198 (1964-08-01), Morbidelli et al.
patent: 3261467 (1973-09-01), Williams et al.
patent: 3904609 (1975-09-01), Mattone et al.
patent: 3912721 (1975-10-01), Mattone et al.
patent: 4036830 (1977-07-01), De Rooijj et al.

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