| 摘要 |
The inventive method for purifying (meth)acrylic acid by oxidising a propane and/or propylene and/or acrolein (acrylic acid production) and isobutane and/or isobutene and/or tert-butyl alcohol and/or methacrolein (methacrylic acid production) gaseous substrate consists in sending a gaseous mixture of a reaction ( 1 ) to the base of an absorption column (C 1 ) which is supplied by the top and in counter-current by at least one type of hydrophobe absorption heavy solvent, in sending a flow ( 2 ) from the base of the column (C 1 ) to a light component separation column (C 2 ) and in sending a flow ( 4 ) from the base of the column (C 2 ) to a separation device which is provided with three sections i.e. exhaustion (S 1 ), concentration (S 2 ) and rectification (S 3 ), respectively in order to extract a pure desired acid, extract and advantageously recycling one or several types of heavy solvent in the absorption column (C 1 ) and to separate intermediate heavy stabiliser-containing components from the desired (meth)acrylic acid.
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