| 摘要 |
PURPOSE: To provide a method for purifyingε-caprolactone by which a high yield of theε-caprolactone is obtained from a reactional mixture prepared by oxidizing cyclohexanone by distillation. CONSTITUTION: Low-boiling substances contained in a reactional mixture prepared by oxidizing cyclohexanone are distilled away by the first distillation step and high-boiling fraction impurities are then taken out in a low concentrated state as a bottom product in the second distillation step for distilling away the productε-caprolactone from the first bottom product and separating theε-caprolactone from high-boiling substances so as to provide at least >=20wt.% lactone concentration in the second bottom product. Theε- caprolactone contained in the second bottom product is subsequently evaporated with an evaporator and recovered in a method for purifying theε-caprolactone by distilling the reactional mixture and separating theε-caprolactone from the impurities.
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