Process for recovering N-Vinyl-2-Pyrrolidone

摘要

A process comprising recovering N-vinyl-2-pyrrolidone by continuously distilling a liquid mixture comprising N-vinyl-2-pyrrolidone, N-(2-hydroxyethyl)-2-pyrrolidone, one or more compounds having a higher boiling point than N-vinyl-2-pyrrolidone and water, using a distilling column, which process is characterised in that the temperature of the bottom liquid of the distilling column is controlled to be 180 DEG C or less, and the bottom residue comprising N-vinyl-2-pyrrolidone, N-(2-hydroxyethyl)-2-pyrrolidone and the compounds having a higher boiling point than N-vinyl-2-pyrrolidone is withdrawn from the distilling column.