公开(公告)号：US5959148A

公开(公告)日：1999-09-28

申请号：US828472

申请日：1997-03-31

申请人： Shin-ichi Sato ,  Takahiro Oshida ,  Hiroshi Izumikawa ,  Akihiko Tanaka ,  Eiichiro Koresawa

发明人： Shin-ichi Sato ,  Takahiro Oshida ,  Hiroshi Izumikawa ,  Akihiko Tanaka ,  Eiichiro Koresawa

IPC分类号： C07C231/24 ,  C07C233/03

CPC分类号： C07C231/24

摘要： A purification process of N-vinylformamide, which comprises: providing a crude N-vinylformamide having an acetone-insoluble component content of not more than 400 ppm; and continuously feeding the crude N-vinylformamide into a fractionating tower, to obtain an N-vinylformamide having high purity. Also disclose is a continuous purification process of N-vinylformamide, which comprises the steps of: providing a crude N-vinylformamide; feeding the crude N-vinylformamide into a thin film evaporator to remove un-evaporated fraction from the system, and feeding the evaporated fraction containing N-vinylformamide into a fractionating tower, distilling the purified N-vinylformamide from the tower head, and discharging a bottom liquid containing N-vinylformamide from the tower bottom, and recycling the bottom liquid into the thin film evaporator to remove un-evaporated fraction from the system, and feeding the evaporated fraction into the fractionating tower.

摘要翻译： 一种N-乙烯基甲酰胺的纯化方法，其包括：提供丙酮不溶组分含量不超过400ppm的粗N-乙烯基甲酰胺; 并将粗N-乙烯基甲酰胺连续进料到分馏塔中，得到高纯度的N-乙烯基甲酰胺。 还公开了N-乙烯基甲酰胺的连续纯化方法，其包括以下步骤：提供粗制N-乙烯基甲酰胺; 将粗N-乙烯基甲酰胺进料到薄膜蒸发器中以从系统中除去未蒸发的馏分，并将含有N-乙烯基甲酰胺的蒸馏馏分进料到分馏塔中，从塔头蒸馏纯化的N-乙烯基甲酰胺，并将塔底 液体含有来自塔底的N-乙烯基甲酰胺，并将底部液体再循环到薄膜蒸发器中以从系统中除去未蒸发的馏分，并将蒸发的馏分进料到分馏塔中。