| 摘要 |
Disclosed is an apparatus or process for production of a highly pure diol in an industrial scale using a cyclic carbonate and an aliphatic monohydric alcohol as starting materials. More specifically, disclosed is an industrial apparatus or process for production of the highly pure diol at low cost, wherein the apparatus or process enables to produce the highly pure diol stably in an amount of 1 ton/hour or more, preferably 2 tons/hour or more, more preferably 3 tons/hour or more for a long period (e.g., 1000 hours or longer, preferably 3000 hours or longer, more preferably 5000 hours or longer). The apparatus or process is characterized in that a continuous multi-component distillation column (E) having a specific structure is used and a liquid component is drawn from a side-cut drain outlet provided in the upper part of a chimney tray having a specific structure which is placed in a concentration unit of the distillation column (E).
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