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公开(公告)号：EP4163269A1
公开(公告)日：2023-04-12
申请号：EP21816971.2
申请日：2021-05-31
发明人： KASE, Yuki , SUGIMOTO, Takashi
摘要： A method for producing an easily polymerizable compound, comprising a polymerization prevention step of supplying an oxygen-containing gas to an easily polymerizable compound-containing liquid through a gas supply means having one or more supply ports, wherein an area S (mm 2 ) per one supply port is 0.1 or more and 20 or less, and a ratio V/S of a linear velocity V (m/s) of the gas at the supply port to the area S in the polymerization preventing step is 6.0 or more.
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公开(公告)号：EP3632890A1
公开(公告)日：2020-04-08
申请号：EP18806372.1
申请日：2018-05-22
摘要： A method for producing (meth)acrylic acid comprising: a step of obtaining a (meth)acrylic acid-containing gas by subjecting a (meth)acrylic acid production raw material to a catalytic gas phase oxidation reaction; a step of obtaining a (meth)acrylic acid-containing liquid by bringing the (meth)acrylic acid-containing gas into contact with a collection solvent and/or condensing the (meth)acrylic acid-containing gas by cooling; a step of obtaining crude (meth)acrylic acid by introducing the (meth)acrylic acid-containing liquid into a low-boiling separation column; a step of obtaining purified (meth)acrylic acid and a refining residue containing a glyoxal compound by purifying the crude (meth)acrylic acid; and a step of returning at least a part of the refining residue to the low-boiling separation column; wherein a returning position of the refining residue to the low-boiling separation column is located closer to a bottom side of the low-boiling separation column than a supply port of the (meth)acrylic acid-containing liquid.
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公开(公告)号：EP4166534A1
公开(公告)日：2023-04-19
申请号：EP21818506.4
申请日：2021-05-31
发明人： KASE, Yuki , SUGIMOTO, Takashi
摘要： A method for producing an easily polymerizable compound, comprising a step of introducing an easily polymerizable compound-containing liquid into a vaporization separation column (1) selected from a distillation column and a stripping column to purify, wherein: the vaporization separation column (1) is provided with a circulation path (2) for returning a drawn liquid, obtained by withdrawing at least a part of a bottom liquid (3) of the column, to the vaporization separation column (1); the circulation path (2) is provided with a reboiler (4) having a heating part (5) and a supply port (7) for supplying an oxygen-containing gas on an upstream side of the reboiler (4); the supply port (7) is located below an inlet of the heating part (5) with a height difference of 0.5 m or more; and an oxygen-containing gas is supplied to the drawn liquid from the supply port (7).
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