| 摘要 |
A process for producing a methacrylic ester which comprises subjecting methyl methacrylate and an alcohol or phenol to transesterification in a reactor equipped with a distillation column while removing from the system the by-product methanol as an azeotropic mixture with methyl methacrylate with refluxing, wherein after the temperatures in the uppermost section, intermediate section, and lowermost section in the distillation column reached 63 to 68°C, 68 to 90°C, and 90 to 100°C, respectively, in terms of temperature at ordinary pressure, the removal of the azeotropic mixture of methanol and methyl methacrylate from the system is initiated and the refluxing ratio is regulated so as to maintain such temperatures in the distillation column throughout the period in which the conversion of the alcohol or phenol is in the range of 0 to 95%. Thus, a methacrylic ester is produced with satisfactory productivity.
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