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    • 3. 发明授权
    • Production process for hydroxyalkyl(meth)acrylate
    • (甲基)丙烯酸羟烷基酯的制备方法
    • US06458988B1
    • 2002-10-01
    • US09664953
    • 2000-09-16
    • Hajime MatsumotoTokumasa IshidaYasuhiro ShingaiMasatoshi UeokaYukihiro Yoneda
    • Hajime MatsumotoTokumasa IshidaYasuhiro ShingaiMasatoshi UeokaYukihiro Yoneda
    • C07C6726
    • C07C67/26C07C69/54
    • A production process for a hydroxyalkyl(meth)acrylate, which comprises the steps of carrying out a reaction between (meth)acrylic acid and an alkylene oxide and stripping the unreacted residue of the alkylene oxide from the resultant reaction liquid, wherein: (1) the stripping step is performed by use of an inert gas, and the concentration of oxygen in the inert gas is adjusted in the range of 0.1 to 5 mol %; (2) the concentration of the unreacted residue of the (meth)acrylic acid in the resultant reaction liquid is suppressed to not higher than 10 weight %; (3) the difference in operational pressure between the stripping step and the absorption step of causing a solvent to absorb the stripped alkylene oxide is suppressed to not more than 1,000 hPa; (4) the reaction liquid resultant from the reaction is directly supplied to the stripping step without being heated; (5) a part of the liquid left behind in the stripping step is heated and then supplied to the stripping step again; (6) a hydroxyalkyl (meth)acrylate solution is used as the absorbing solvent; (7) a part of the liquid resultant from the absorption step is cooled and then supplied to the absorption step again; or (8) a part or the whole of the absorbing liquid which is on the way of the absorption step is extracted and then cooled and then supplied to the absorption step again.
    • (甲基)丙烯酸羟烷基酯的制备方法,其包括以下步骤:从所得反应液体中进行(甲基)丙烯酸和烯化氧之间的反应并从所述环氧烷脱除未反应的残留物,其中:(1) 通过使用惰性气体进行汽提工序,将惰性气体中的氧浓度调整为0.1〜5摩尔%的范围; (2)将所得反应液中的(甲基)丙烯酸的未反应残渣的浓度抑制在10重量%以下。 (3)使汽提步骤和使溶剂吸附汽提的环氧烷的吸收步骤之间的操作压力差被抑制在不超过1,000hPa; (4)将反应产生的反应液直接供给到汽提步骤而不加热; (5)在汽提步骤中留下的一部分液体被加热,然后再次供给到汽提步骤; (6)使用(甲基)丙烯酸羟烷基酯溶液作为吸收溶剂; (7)从吸收步骤得到的液体的一部分被冷却,然后再次供给到吸收步骤; 或者(8)吸收步骤中的吸收液体的一部分或全部被提取,然后冷却,然后再次供给到吸收步骤。