Patent ID: 6914162

Claim:
A process for preparing hydroformylation products of olefins having from 2 to 8 carbon atoms, which comprises a) feeding a hydrocarbon feedstock into a cracking/dehydrogenation zone and subjecting it to thermal and/or catalytic crackinq and/or dehydrogenation to give an olefin-containing cracker gas, b) subjecting the cracker gas or fractions thereof to a fractionation to give at least one C i -olefin-enriched hydrocarbon stream and at least one C i -olefin-depleted hydrocarbon stream, c) feeding the C i -olefin-enriched hydrocarbon stream together with carbon monoxide and hydrogen into a hydroformylation zone and reacting it in the presence of a hydroformylation catalyst, d) separating a stream consisting essentially of unreacted C i -olefin and saturated C i -hydrocarbon front the output from the hydroformylation zone, e) recirculating at least part of the stream consisting essentially of unreacted C i -olefin and saturated C i -hydrocarbon to step b), where i is an integer from 2 to 8.