| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing (meth)acrylic acid, wherein a high purity (meth)acrylic acid can be recovered in a high yield by thermally decomposing by products of the Michael addition reaction, and to provide a method for overcoming troubles such as clogging occurred in the production process. SOLUTION: The method includes a reaction process for formation of (meth) acrylic acid by oxidizing a raw material, a distillation process of a crude (meth) acrylic acid separating light fractions from the reaction mixture, a recovering process for (meth)acrylic acid by thermally decomposing the by-products and a process for supplying the recovered (meth)acrylic acid to the distillation process. The thermal decomposition temperature of the by-products is 140-240°C, and the thermal decomposition pressure is 70 to 130 kPa. COPYRIGHT: (C)2003,JPO
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