Process for the purification of caprolactam

摘要

Object of the invention is a process for the purification of epsilon -caprolactam prepared either by Beckmann rearrangement or by rearrangement of cyclohexanoxime in the gaseous phase or by depolymerisation of polyamide waste comprising treating the solid, finely-divided crude lactam with an organic solvent for a period of up to 60 hours at a temperature from 0 DEG to 50 DEG C. According to the purification process many impurities could be removed without a substantial decrease in the yield of the purified caprolactam.