Patent ID: 7714164
Filing Date: 2010-05-11
Classification: C07C

Abstract:
1. A method for producing (meth)acrylic acid comprising: obtaining a (meth)acrylic acid-containing gas from a raw material for producing (meth)acrylic acid by a catalytic gas phase oxidation reaction; obtaining a (meth)acrylic acid-containing solution from the (meth)acrylic acid-containing gas; adjusting a water content of the (meth)acrylic acid-containing solution to 10 mass % or less; and subjecting the (meth)acrylic acid-containing solution containing 10 mass % or less of water to a crystallization process, thereby producing a purified (meth)acrylic acid, wherein the adjusting of the water content is carried out by mixing a purified (meth)acrylic acid and/or a (meth)acrylic acid-containing solution containing 10 mass % or less of water into a (meth)acrylic acid-containing solution containing more than 10 mass % of water obtained from the (meth)acrylic acid-containing gas.