A high purity ε-caprolactam is prepared by pouring a molten crude ε-caprolactam and a solvent comprising an aliphatic hydrocarbon and having a lower temperature than that of the crude ε-caprolactam, into a vessel and mixing them to obtain a first slurry containing a crystallized ε-caprolactam. The slurry is then subjected to a solid-liquid separation to obtain ε-caprolactam and a first liquid phase. This process can effectively remove impurities from a crude ε-caprolactam, which is obtained by for example, subjecting cyclohexanone oxime to the Beckmann rearrangement.
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Paragraph [0056] - [0059]
(2008/06/13)
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