Patent ID: 7622607
Filing Date: 2009-11-24
Classification: C07C

Abstract:
1. A process for the purification of (meth)acrylic acid from reaction gas mixture obtained by catalytic or redox oxidation of a gas selected from the group consisting of propane, propylene, acrolein, isobutane, isobutene, tertbutyl alcohol, (meth)acrolein and mixture thereof, characterized in that: said purification takes place in the presence of at least one polymerization inhibitor; said reaction gas mixture ( at the top of the column (Cl) a gas stream ( at the bottom of said column (C the stream ( at the top of column (C at the bottom, a stream ( characterized in that column (Cl) is operated with flow rate of said at least one heavy hydrophobic absorption solvent or solvents that is 3 to 5.6 times the flow rate of (meth)acrylic acid in the reaction gas mixture, and in that, as a separation column (C 2 ), a rectification column is used, which is operated with a top feed and without reflux and without the introduction of external inert gas.