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    • 5. 发明申请
    • PURIFICATION OF N,N-DIMETHYLACETAMIDE
    • N,N-二甲基乙酰胺的纯化
    • WO2004002926A2
    • 2004-01-08
    • PCT/US0319405
    • 2003-06-18
    • MALLINCKRODT INCGENTILCORE MICHAEL J
    • GENTILCORE MICHAEL J
    • B01D3/14B01D3/42C07C231/24C07C233/05C07C
    • C07C231/24B01D3/146Y10S203/09C07C233/05
    • A method to purify N,N-dimethylacetamide (DMAc) from an aqueous solution containing acetic acid as a contaminant. Two fractional distillation columns are arranged in a series. The solution containing the contaminant is provided to the first column with a temperature profile to result in acetic acid partitioning into the overhead water. The material remaining in the bottom portion of the first column is recycled to the first column and also provided into a second column, whereby DMAc free of acetic acid contamination is recovered, and remaining DMAc and acetic acid are returned to the first column for further separation. The method uses standard fractional distillation procedures and equipment, thus eliminating the need for more complex extractions and/or chromatographic separations.
    • 从含有乙酸作为污染物的水溶液中净化N,N-二甲基乙酰胺(DMAc)的方法。 两个分馏塔排列成一系列。 将含有污染物的溶液以温度分布提供给第一塔,导致乙酸分配到塔顶水中。 残留在第一塔底部的材料被再循环到第一塔并且还提供到第二塔中,由此回收不含乙酸污染的DMAc,并且将剩余的DMAc和乙酸返回到第一塔进行进一步分离 。 该方法使用标准的分馏程序和设备,因此不需要更复杂的萃取和/或色谱分离。