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    Method for purifying acrylic acid
    1.
    发明授权
    Method for purifying acrylic acid 失效
    丙烯酸纯化方法

    公开(公告)号：US06352619B1

    公开(公告)日：2002-03-05

    申请号：US09254874

    申请日：1999-04-14

    申请人： Michel Fauconet ,  Francis Augustin ,  Marc Esch

    发明人： Michel Fauconet ,  Francis Augustin ,  Marc Esch

    IPC分类号： B01D334

    CPC分类号： C07C51/487 ,  C07C51/44 ,  C07C51/50 ,  Y10S203/22 ,  C07C57/04

    摘要： Process for purifying acrylic acid in order to remove the polymer-type impurities in those places in the distillation columns in which they have a tendency to accumulate, and more particularly a process directed towards removing the polymeric impurities which are formed during a step for removing the aldehyde impurities from acrylic acid, according to which step the medium containing the acrylic acid to be purified is distilled by adding to this medium at least one amino compound of hydrazine type and by flushing away, at the foot of the distillation column, the heavy compounds formed by the said hydrazine-type amino compound(s) with the impurities. According to the invention, the acrylic acid to be purified is also distilled in the presence of at least one compound from the class of nonionic surface agents and of at least one polymerization inhibitor. Polysaccharide ethers and acetates, in particular ethers derived from cellulose or starch, may be mentioned as nonionic surface agents.

    摘要翻译： 用于净化丙烯酸的方法，以便去除它们具有积聚趋势的蒸馏塔中的那些位置的聚合物型杂质，更具体地，涉及去除在除去所述聚合物杂质的步骤期间形成的聚合物杂质的方法 根据该步骤，将含有待纯化的丙烯酸的培养基通过向该培养基中加入至少一种肼型氨基化合物并在蒸馏塔的底部冲洗掉重质化合物 由所述肼型氨基化合物与杂质形成。根据本发明，待纯化的丙烯酸还在至少一种来自非离子表面活性剂的化合物和至少一种 聚合抑制剂。 多糖醚和乙酸酯，特别是衍生自纤维素或淀粉的醚，可以被称为非离子表面活性剂。