Patent ID: 8278481
Filing Date: 2012-10-02
Classification: C07C

Abstract:
1. A method for producing (meth)acrylic acid, comprising steps of: producing a (meth)acrylic acid-containing gas by catalytic gas phase oxidation reaction; and obtaining a (meth)acrylic acid-containing fluid by providing the (meth)acrylic acid-containing gas into a condensation column or an absorption column; wherein manganese acetate is used as a polymerization inhibitor; manganese acetate is dissolved into (a) a (meth)acrylic acid aqueous solution containing not less than 0.1% by mass and not more than 7% by mass of (meth)acrylic acid, or (c) a mixed aqueous solution containing not less than 0.1% by mass and not more than 7% by mass of (meth)acrylic acid and an other organic acid, to obtain a manganese acetate aqueous solution; and the manganese acetate aqueous solution is provided into the condensation column or the absorption column.