Process for the Recovery of Organic Compounds from Mixtures Containing (Meth)Acrylic Acid by Extraction with a Protic Solvent
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United States of America Patent
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Issued Date -
May 22, 2008
app pub date -
Feb 7, 2006
filing date -
Feb 8, 2005
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Abandoned
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Abstract
The invention relates the preparation of (meth)acrylic acid comprising the steps: i) bringing a composition Z.sub.1 comprising (meth)acrylic acid and aldehydes into contact with an aldehyde-trapping agent to give a composition Z.sub.2 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 Z.sub.2 by means of distillation, whereby a composition Z.sub.3 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 Z.sub.3 by water, a first, aqueous phase P.sub.1 and a second, organic phase P.sub.2 being obtained; iv) separating off of the first, aqueous phase P.sub.1 from the second, organic phase P.sub.2.
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