Patent ID: 8445728

Claim:
A process for working up a liquid output from a hydroformylation reaction, which output contains aldehyde, high-boiling by-products of the hydroformylation reaction, a homogeneously dissolved rhodium complex catalyst, unreacted olefinically unsaturated compound, synthesis gas and volatile by-products, in which a) the liquid hydroformylation output is depressurized in a depressurization vessel, resulting in separation into a liquid phase and a gas phase; and b) the liquid phase obtained in the depressurization vessel is introduced into a separation apparatus in which separation into a liquid phase containing essentially high-boiling by-products of the hydroformylation reaction, the homogeneously dissolved rhodium complex catalyst and small amounts of the aldehyde and a gas phase containing the predominant amount of the aldehyde is carried out; and c) a liquid, rhodium-containing output is discharged from the separation apparatus, characterized in that the liquid, rhodium-containing output discharged from the separation apparatus is passed through a filter and solids separated off are removed from the process while the filtrate obtained is recirculated to the hydroformylation reaction.