US Patent 7087797 Continuous hydroformylation process

A continuous hydroformylation process for forming an aldehyde comprising 1) reacting an olefinically unsaturated compound containing from 2 to 30 carbon atoms with carbon monoxide and hydrogen in the presence of a rhodium-bisphosphite ligand complex catalyst and 2) distilling a mixture comprising at least a part of the catalyst of 1), wherein the distilling is performed in the substantial absence of molecular hydrogen.