Verfahren zur Gewinnung von reinem N-Vinylpyrrolidon

摘要

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.