Patent ID: 8246790

Claim:
A (meth)acrylic acid collecting method for collecting a (meth)acrylic acid from a mixed gas that includes an organic byproduct, a steam and a (meth)acrylic acid that are prepared in a production reaction of the (meth)acrylic acid, wherein the (meth)acrylic acid collecting method comprises the steps of: a) contacting the mixed gas that includes the organic byproduct, the steam, and the (meth)acrylic acid with a (meth)acrylic acid absorption solvent, to obtain a (meth)acrylic acid containing solution and a gas that includes the organic byproduct and the steam while the gas and the (meth)acrylic acid containing solution are separated from each other, the (meth acrylic acid absorption solvent includes the organic byproduct at a concentration of 9 to 12%; b) contacting the gas that includes the organic byproduct and the steam obtained in the step a) with the organic byproduct absorption solvent, to obtain an organic byproduct containing solution and a gas that includes the steam and while the gas and the organic byproduct containing solution are separated from each other; c) supplying the gas that includes the steam obtained in the step b) into the production reaction of the (meth)acrylic acid; and d) obtaining the (meth)acrylic acid and the organic byproduct containing solution from the (meth)acrylic acid containing solution obtained in the step a), and wherein the method further comprises a step of supplying the organic byproduct containing solution that is obtained in the steps b) and d) into the step a), so as to be used as the (meth)acrylic acid absorption solvent of the step a).