| 摘要 |
PURPOSE:To efficiently separate the titled compound useful as a flocculant, etc., by dissolving a mixture of ethylidenebisacetamide, N-vinylacetamide and acetamide in a specific mixed solvent and optionally cooling. CONSTITUTION:A mixture of ethylidenebisacetamide, N-vinylacetamide and acetamide is dissolved in a mixed solvent of (A) a ketone solvent and (B) an aliphatic and/or an aromatic hydrocarbon solvent, optionally cooled and then precipitate is removed if the precipitate is produced. Or when the solution is separated into two layers, one layer is removed and N-vinylacetamide is separated from the mixture. Acetone, methyl ethyl ketone, etc., may be used as the solvent A and pentane, hexane, etc., as the solvent B and the weight ratio of the solvent A:B is 1:30-30:1, preferably 1:10-10:1.
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