Apparatus for a process for redissociating michael adducts which are present in a liquid f and have been formed in the preparation of acrylic acid or esters thereof

An operating unit to conduct the process for redissociating Michael adducts, comprising:

• a separation column K having ajoined in vertical order, a bottom space, a separating space and a top space;
• a radial centrifugal pump P having a semiopen radial impeller;
• and
• an indirect heat exchanger UW having a primary space and a secondary space;
• wherein
• the liquid Feed Point I is located in the separating space of the column above a lowest separating internal,
• the separating space of the column K comprises separating internals,
• the centrifugal pump P is intermediate in a flow line between the bottom space of the column K and an inlet of the secondary space of indirect heat exchanger,
• an outlet line of the secondary space of the indirect heat exchanger is connected to the column K at a Feed Point II which is in the bottom space of the column K,
• Feed Point II is located below the lowermost separating internal of the separating column K and above the level S of the bottoms liquid, and is not directed toward the bottoms liquid,
• the primary space and the secondary space of the indirect heat exchanger are separated by a material dividing wall D.