| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for purifyingε-caprolactone reduced in acid value and moisture content. SOLUTION: A low-boiling fraction contained in a reactional solution is distilled off in the first distillation column to provide the first bottom liquid, which is then fed to the second distillation column having a concentrating section of three or more stages to distill off a low-boiling fraction from the column top of the second distillation column. A high-boiling substance is then taken out of the column bottom of the second distillation column to take outε- caprolactone from any stage within the range of 30-90% of the number of stages from the feed stage of the second distillation column to the topmost stage from the side of the column bottom.
|
