| 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 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°-80° C. and at atmospheric pressure with 0.005-0.5% by weight of KMnO 4 . The amount of alkali (NaOH) used in the fast distillation is comprised between 0.05 and 0.5% by weight. |