| 摘要 |
The present invention relates to a method for purifying (meth)acrylic acid obtained by catalytic or redox oxidation of a gaseous substrate constituting propane, propylene, acrolein, isobutane, isobutene, tert-butyl alcohol and/or (meth)acrolein or mixtures thereof by sending the gaseous reaction mixture to the bottom of a countercurrent absorption column (C 1 ) which is supplied at the top with at least one type of hydrophobic heavy solvent, sending the flow ( 4 ) from the bottom of column (C 1 ) to a separation column (C 2 ). Column (C 1 ) is operated at a flow rate of heavy solvent of from 3 to 5.6 times the flow rate of the (meth)acrylic acid in the gaseous reaction mixture and the rectifying column used as a separation column (C 2 ) is operated with the feed at the top and without reflux.
|
