| 摘要 |
PROBLEM TO BE SOLVED: To provide a process for producing an unsaturated carboxylic acid ester in high selectivity while solving the problems inherent to the process for producing an unsaturated carboxylic acid ester by the esterification reaction of an unsaturated carboxylic acid with an alcohol such as the waste water treatment in the case of using an acid catalyst and the insufficient reaction rate in the use of an ion exchange resin. SOLUTION: An acid salt of a heteropolyacid is used as an esterification catalyst in the production of an unsaturated carboxylic acid ester. Preferable heteropolyacids are phosphomolybdic acid, phosphotungstic acid, silicomolybdic acid, silicotungstic acid and the like. The alcohol is a 1-8C aliphatic monohydric alcohol and the unsaturated carboxylic acid is acrylic acid or methacrylic acid. |
