Patent ID: 9290431
Filing Date: 2016-03-22
CPC Classification: C07C

Claim Text:
1. A process for preparing highly pure, non-yellowing (meth)acrylic acid, comprising: a) condensing a (meth)acrylic acid-containing gas phase obtained via a gas phase oxidation process of a C4-compound to generate an aqueous (meth)acrylic acid solution; b) separating the (meth)acrylic acid from the aqueous (meth)acrylic acid solution to obtain crude (meth)acrylic acid; c) rectifying the crude (meth)acrylic acid in a rectification column to obtain pure (meth)acrylic acid via a sidestream outlet of the rectification column; d) treating the pure (meth)acrylic acid generated in c) with an ion exchange resin; and e) distilling the (meth)acrylic acid generated in d).