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    • 2. 发明授权
    • Propylene oxide purification
    • 环氧丙烷净化
    • US6024840A
    • 2000-02-15
    • US908604
    • 1997-08-08
    • Michael A. Rueter
    • Michael A. Rueter
    • C07D301/32C07D303/04B01D3/40C07C301/12C07C301/32
    • C07D301/32
    • Propylene oxide obtained by an epoxidation process which uses methanol as a solvent may be effectively treated to remove acetaldehyde by subjecting the crude epoxidation reaction product to fractional distillation. The methanol solvent is utilized during such distillation to lower the relative volatility of the acetaldehyde impurity, thereby making it possible to obtain a bottoms fraction containing substantially all the acetaldehyde. Purified propylene oxide having a reduced acetaldehyde concentration is removed as an overhead stream. Water may also be effectively separated from the propylene oxide using this procedure.
    • 通过使用甲醇作为溶剂的环氧化方法获得的环氧丙烷可以通过使粗环氧化反应产物进行分馏而被有效地处理以除去乙醛。 在这种蒸馏期间使用甲醇溶剂来降低乙醛杂质的相对挥发性,从而可以获得含有基本上所有乙醛的塔底馏分。 具有降低的乙醛浓度的纯化的环氧丙烷作为塔顶物流被除去。 也可以使用该方法将水与环氧丙烷有效分离。