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    • 6. 发明授权
    • Purification of acrylic acid and methacrylic acid
    • 丙烯酸和甲基丙烯酸的纯化
    • US5831124A
    • 1998-11-03
    • US798138
    • 1997-02-12
    • Otto MachhammerAlbrecht DamsBernd EckTheo Proll
    • Otto MachhammerAlbrecht DamsBernd EckTheo Proll
    • C07C57/04C07C51/43C07C57/05C07C57/07C07C51/42
    • C07C51/43
    • Acrylic acid or methacrylic acid is purified by (a) subjecting a mixture comprising the acrylic acid or methacrylic acid to a sharply defined separation process essentially in the absence of an organic solvent, with the composition of the phase in which the acrylic acid or methacrylic acid accumulates remaining essentially constant when the composition of the other phases participating in the mass transfer changes, then taking off this phase and (b) subjecting at least a part of the remaining phase from stage(a) to a less sharply defined separation process and (c) feeding one of the phases formed in stage (b) to the sharply defined separation process in stage (a). In addition, the invention provides a process for preparing acrylic acid or methacrylic acid which includes the abovementioned purification process.
    • 丙烯酸或甲基丙烯酸通过(a)基本上在不存在有机溶剂的情况下对包含丙烯酸或甲基丙烯酸的混合物进行急剧定义的分离过程来纯化,其中丙烯酸或甲基丙烯酸 当参与质量传递的其它相的组成发生变化时,剩下的基本上保持恒定,然后脱除该相,和(b)使来自阶段(a)的剩余相的至少一部分经受较不明确的分离过程和( c)在步骤(a)中将阶段(b)中形成的相中的一个进料加入到明确限定的分离过程中。 此外,本发明提供一种制备丙烯酸或甲基丙烯酸的方法,其包括上述纯化方法。