12.
    发明专利
    未知

    公开(公告)号:DE10026233A1

    公开(公告)日:2001-11-29

    申请号:DE10026233

    申请日:2000-05-26

    Applicant: BASF AG

    Abstract: The invention relates to a method for obtaining pure N-vinyl pyrrolidone from raw materials containing N-vinyl pyrrolidone, said method comprising a single or multiple-stage crystallisation method. The method is characterised in that the mother liquor of the first crystallisation stage is either purified by distillation and/or extraction or is returned to a product stream of the production process, said stream containing an N-vinyl pyrrolidone.

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