| 摘要 |
<p>A process in which a by-product of the Michael addition reaction in a (meth)acrylic acid production step is pyrolyzed to enable high-purity (meth)acrylic acid to be recovered in high yield and troubles such as clogging in production steps are also prevented. The process comprises: a reaction step for (meth)acrylic acid production in which a starting compound therefor is oxidized; a distillation step in which light matters are separated from the liquid reaction mixture resulting from the reaction step for acrylic acid production to obtain crude (meth)acrylic acid; a step in which a by-product generated in the production step is pyrolyzed to recover (meth)acrylic acid; and a step in which the (meth)acrylic acid recovered is fed to the distillation step. The pyrolysis of the by-product is conducted at a temperature of 140 to 240°C and a pressure of 70 to 130 kPa.</p> |
