METHOD FOR PRODUCING EASILY POLYMERIZABLE COMPOUNDS

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To provide a method for producing easily polymerizable compounds that includes the step of purifying easily polymerizable compounds with a vaporization separation column provided with a column bottom liquid circuit including a reboiler, whereby the polymerization of the easily polymerizable compounds in the reboiler can be suppressed.SOLUTION : A method for producing easily polymerizable compounds includes the step of introducing an easily polymerizable compound-containing liquid into a vaporization separation column selected from a distillation column and an evaporation column to purify the liquid under reduced pressure. The vaporization separation column is provided with a circuit for returning the extracted liquid, which is at least partial extract of the column bottom liquid, to the vaporization separation column. The circuit is provided with a reboiler including a heating part. Upstream of the reboiler, provided is a feed port for feeding an oxygen-containing gas. The feed port is provided below the heating part by 0.5 m or more. The oxygen-containing gas is fed from the feed port to the extracted liquid.SELECTED DRAWING : Figure 1