| 摘要 |
PURPOSE: A perforated tray without downcomer is provided to distill an easily polymerizable compound, such as an (meth)acrylic acid, or a liquid containing such the easily polymerizable compound in a stable manner over an extended period of time and to effectively prevent the formation of polymers. CONSTITUTION: A perforated tray without downcomer satisfies following conditions. The hole has a diameter of 10mm to 25mm. Two adjacent holes are spaced by a distance of 1.2d to 3d, measured between the two centers. The tray thickness is 2mm to 8mm. The opening ratio is 10% to 30%. A perforated tray tower without downcomer fitted with two or more such perforated trays without downcomer satisfies following conditions. Perforated trays are spaced by a distance of 0.1D to 0.5D, wherein D denotes the tower diameter. The levelness of each perforated tray is 8mm or less. If a plurality of perforated trays are used at the same stage, the two most closely located holes that respectively belong to adjacent perforated trays are spaced by a distance of 50mm to 150mm, measured between the two centers.
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