| 摘要 |
PURPOSE:To readily and efficiently recover methacrylic acid, by adding water to a bottom residue, separating methacrylic acid as an aqueous solution and preferably extracting the methacrylic acid with an organic solvent in recovering the methacrylic acid from the bottom residue prepared by distilling and separating the methacrylic acid therefrom. CONSTITUTION:Water is added to a bottom residue containing polymers and high-boiling components after distilling and separating methacrylic acid therefrom to selectively separate most of the high-boiling components, e.g. high- boiling aldehydes, polymers, polymerization inhibitors, etc., from the aqueous solution of the methacrylic acid into two layers. The methacrylic acid is then extracted from the aqueous solution thereof using preferably an organic solvent, e.g. n-pentane, n-heptane, toluene, xylene, etc., distilled and recovered. Low cost is attained.
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