| 摘要 |
PROBLEM TO BE SOLVED: To provide a preparation method for 2,3-DCH and epichlorohydrin(ECH) capable of controlling the formation of polymers within a distillation column which distills to remove low-boiling point portions and of a continuous operation for a long period relating to a preparation method for 2,3-dichloro-1-propanol(2,3-DCH). SOLUTION: It relates to the preparation method for 2,3-DCH and ECH. This preparation method represents the following features, respectively. To prepare 2,3-DCH, polymerization inhibitor is added within a distillation column which distils to remove the low-boiling point portions from the top of the distillation column, and the components remaining in the bottom of the column and in the bottom of the first distillation column are led to the third distillation column. From the top of the column, 2,3-DCH is recovered. ECH is prepared by subjecting the recovered 2,3-DCH to a saponification reaction. As polymerization inhibitors hydroquinone monomethylether, 2,5-di-tert-butylhydroquinone and 2,2-methylenebis (4-ethyl-6-tert-butylphenol) are preferable.
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