Process for producing epsi-caprolactam

摘要

A high purity epsi-caprolactam is prepared by pouring a molten crude epsi-caprolactam and a solvent comprising an aliphatic hydrocarbon and having a lower temperature than that of the crude epsi-caprolactam, into a vessel and mixing them to obtain a first slurry containing a crystallized epsi-caprolactam. The slurry is then subjected to a solid-liquid separation to obtain epsi-caprolactam and a first liquid phase. This process can effectively remove impurities from a crude epsi-caprolactam, which is obtained by for example, subjecting cyclohexanone oxime to the Beckmann rearrangement.