| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing methyl methacrylate (MMA) without discoloring by an acetone cyanhydrin (ACH) method in a high yield. SOLUTION: This method for producing MMA comprising (1) a process of performing the reaction of acetone cyanhydrin with sulfuric acid or fuming sulfuric acid to produce sulfuric acid salt of methacrylamide, (2) a process of producing MMA by performing the reaction of sulfuric acid salt of methacrylamide with water and methanol, and (3) a process of distilling off the MMA by a distillation for its purification is provided by performing the distillation operation under a condition, by taking at least 1 kind of impurity having a higher boiling point than that of the MMA and contained by≥50 ppm in the MMA which is the subject of the distillation, as an index substance in the process (3), so as to make≤50 ppm content of the index substance in the distillate. COPYRIGHT: (C)2006,JPO&NCIPI
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