Patent ID: 8604238

Claim:
A method for producing (meth)acrylic acid comprising: (1) subjecting a raw material of (meth)acrylic acid to catalytic vapor phase oxidation by molecular oxygen-containing gas, in the presence of an oxidation catalyst to produce (meth)acrylic acid-containing gas; (2) cooling said (meth)acrylic acid-containing gas; and (3) obtaining a (meth)acrylic acid solution by introducing said cooled gas to an absorption tower and contacting said cooled gas with an absorbing agent for acrylic acid to separate non-condensable gas, characterized in that a (meth)acrylic acid solution with a high concentration of equal to or higher than 75% by mass is obtained, by setting a lower temperature limit not less than 200° C. in step (2) for cooling said (meth)acrylic acid-containing gas, from the operation conditions for step (3), and controlling the cooling of said gas during whole reaction period so that said gas temperature does not become below said lower limit of cooling temperature.