Process for the fractional separation of (meth)acrylic acid from a mixture containing (meth)acrylic acid

摘要

A process for the fractional separation of (meth)acrylic acid from a mixture containing (meth)acrylic acid, in which (meth)acrylic acid is tapped off from the rectifying column at a point above the level at which the liquid mixture containing (meth)acrylic acid enters the rectifying column, and at at least one point of the rectifying column the reflux liquid descending therein is tapped off from the rectifying column, oligomerized and/or polymerized (meth)acrylic acid present therein is separated and the reflux liquid is subsequently recycled to the rectifying column.