| 摘要 |
PURPOSE:To readily and efficiently recover methacrylic acid from a bottom residue after separating the methacrylic acid by distillation, by adding an organic solvent to the bottom residue and removing the deposited polymer and high-boiling components by filtration. CONSTITUTION:An organic solvent, e.g. n-pentane, n-hexane, n-heptane, n-octane, cyclohexane, toluene, ethylbenzene or xylene, in an amount of normally 1-4 times based on a bottom residue after separating methacrylic acid by distillation is added thereto to remove the deposited polymer and high-boiling components by filtration using a cartridge filter, pressure leaf filter, etc. Thereby, the methacrylic acid which has been discarded or incinerated together with the polymer and high-boiling components as the bottom residue is advantageously recovered.
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