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AssigneeNippon Shokubai Kagaku Kogyo Co., Ltd.
InventorsSadao Yoshida, Kunihiro Kubota, Daizo Kobayashi, Noboru Shimizu, Takashi Ohara
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A method of distilling a polymerizable vinyl compound selected from the group consisting of acrolein, methacrolein, acrylic acid, methacrylec acid, hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate, glycidyl acrylate and glycidyl methacrylate, the method comprising distilling the polymerizable vinyl compound in the presence of a polymerization inhibitor using a distillation tower having perforated trays without downcomers and wherein the temperature of the inner wall of the tower is maintained at a temperature sufficient to prevent the condensation of the vapor being distilled, whereby the polymerizable vinyl compound is distilled without the formation of polymer.
In a method of distilling a polymerizable vinyl compound selected from the group consisting of acrolein, methacrolein, acrylic acid, methacrylic acid, hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate, glycidyl acrylate and glycidyl methacrylate, by distilling said polymerizable vinyl compound in contact with a polymerization inhibitor for said polymerizable vinyl compound in a distillation tower having perforated trays, the improvement comprising heating the tower to maintain the inner wall thereof at a temperature sufficiently high to prevent condensation of the vapor of the polymerizable vinyl compound being distilled but sufficiently low so as not to diminish the rectification effect of said tower, said temperature being within 30.degree. C. higher than that of the vapor of said polymerizable vinyl compound being distilled, whereby formation of polymer of the polymerizable vinyl compound being distilled is prevented during distillation.
Dependencies are inferred from the claim text.