Process for the recovery of organic compounds from mixtures containing (meth)acrylic acid by extraction with a protic solvent

摘要

The invention relates the preparation of (meth)acrylic acid comprising the steps: i) bringing a composition Z₁ comprising (meth)acrylic acid and aldehydes into contact with an aldehyde-trapping agent to give a composition Z₂ comprising (meth)acrylic acid, the high-boiling reaction product of the aldehyde, and the aldehyde-trapping agent, and unreacted aldehyde-trapping agent; ii) separating off (meth)acrylic acid from the composition Z₂ by means of distillation, whereby a composition Z₃ comprising the high-boiling reaction product from the reaction between the aldehyde and the aldehyde-trapping agent and unreacted aldehyde-trapping agent is being obtained as the bottom product; iii) extracting the unreacted aldehyde-trapping agent from the composition Z₃ by water, a first, aqueous phase P₁ and a second, organic phase P₂ being obtained; iv) separating off of the first, aqueous phase P₁ from the second, organic phase P₂.