Process for hydroformylation of diisobutene and a c4 to c7 olefin

Process for hydroformylation of diisobutene and a C4 to C7 olefin, wherein the process comprises at least the following steps:

• a. providing a diisobutene stream containing 2,4,4-trimethylpent-2-ene and 2,4,4-trimethylpent-1-ene and providing an olefin stream containing the C4 to C7 olefin;
• b. hydroformylation of diisobutene and the C4 to C7 olefin with synthesis gas in the presence of a homogeneous catalyst system comprising at least Co or Rh and optionally a phosphorus-containing ligand in a reaction zone to obtain a preferably liquid product mixture comprising at least the aldehydes 3,5,5-trimethylhexanal and a C5 to C8 aldehyde formed by the hydroformylation, the homogeneous catalyst system and unreacted olefins;
• c. removing the homogeneous catalyst system from the preferably liquid product mixture to obtain a crude product mixture comprising at least the aldehydes 3,5,5-trimethylhexanal and a C5 to C8 aldehyde formed by the hydroformylation and the unreacted olefins;
• and
• d. distillative processing of the crude product mixture in at least one distillation column to remove the unreacted olefins to obtain an aldehyde mixture containing the aldehydes 3,5,5-trimethylhexanal and a C5 to C8 aldehyde formed.