A process for hydroformylation of an olefin, which comprises reacting an olefin with carbon monoxide and hydrogen in the presence of a rhodium catalyst having a trivalent organic phosphorus compound as a ligand, wherein the hydroformylation reaction is conducted by two stage reactor systems i.e., a first...http://www.google.es/patents/US5105018?utm_source=gb-gplus-sharePatente US5105018 - Process for hydroformylation of an olefin