Gas description of the resulting (meth) acrylic acid by oxidation purification method

摘要

is an object of the present invention in the case of acrylic acid, the arc Rolin propane and / or propylene, methacrylate If the acid is to manufacture the tablet and the resulting (meth) acrylic acid by the methacrolein lean of isobutane and / or isobutene and / or catalytic oxidation or oxidation reaction of the gas substrate consisting of t- butyl alcohol. ; In order to do this, the reaction gas mixture (1) and the device in state, is fed to the bottom of the absorption column (C1) from flowing back by the heavy hydrophobic absorption solvent, of at least 1, the absorbing solvent is, the column (C1 In the bottom of) the (meth) acrylic acid, the heavy absorption solvent (s), a heavy secondary reaction product and a small amount of acetic acid and water in the case (methacrylic acid are for obtaining the flow (4) consisting of acrylic acid with a), The stream (4) flows in the column (C1) is fed to the separation column (C2). Column (C1) is operated as a (meth) acrylate, from 3 to 5.6 times higher than the flow rate in the feed gas mixture, the rectification column is used as the separation column is operated with the supply non-reflux state (C2).