The present invention relates to a column (1) for thermal treatment of a fluid, having a cylindrical, vertical column body (2) which forms a column cavity (3), and a mass transfer tray (4) which is disposed in the column cavity (3) and forms a collecting area (5). The inventive column (1) is characterized by a circulation device (9) having at least one drain orifice (10) formed in the column body (2) above the collecting area (5), a circulation line (11) in fluid connection with the drain orifice (10) and at least one recycling orifice (14; 14-1 to 14-3) which is in fluid connection with the circulation line (11) and is formed in the column body (2) above the collecting area (5). The invention also relates to a thermal separating process in which such a column (1) is used. In this separating process, a gas ascends within the column and a liquid descends within the column, said gas and/or liquid especially comprising (meth)acrylic monomers.