METHOD FOR PRODUCING HIGH-QUALITY ε-CAPROLACTAM

摘要

A method for producing a high-quality epsilon-caprolactam, the method involving a crystallization step for crystallizing a high-quality epsilon-caprolactam by pouring and combining, into and with a crystallization solution in a container, a melted rough epsilon-caprolactam and a mixed solvent of a cyclohexane and an n-heptane having a temperature that is 20 to 100°C lower than the crystallization temperature of the melted epsilon-caprolactam, wherein the container is equipped with a stirring instrument and a baffle, and the melted rough epsilon-caprolactam and the mixed solvent are poured and combined while injecting the entire baffle in the container into the crystallization solution when the stirring instrument is being used during the crystallization step.