Patent ID: 8404902

Claim:
A process for removing 1-butene from a C 4 hydrocarbon mixture comprising isobutene and 1-butene by hydroformylation, said process comprising hydroformulating a hydroformulation mixture comprising said C 4 hydrocarbon mixture and a catalyst system comprising one or more of the transition metals of groups 8 to 10, and a bisphosphite ligand of the following formula I where X is a divalent substituted or unsubstituted bisalkylene or bisarylene radical which comprises one or more heteroatom(s), Y is a divalent substituted or unsubstituted bisarylene radical or a divalent substituted or unsubstituted bisalkylene radical which comprises one or more heteroatom(s), Z is oxygen or NR 9 , and R 1 , R 2 , R 3 , R 4 are identical or different, substituted or unsubstituted, connected, unconnected or fused aryl or heteroaryl radicals, and R 9 is hydrogen or substituted or unsubstituted alkyl or aryl radical which comprises one or more heteroatom(s), the bisphosphite ligand of the above-specified formula I being in an excess of a molar ratio of 100:1 to 1:1 relative to the transition metal, and less than 5% of the isobutene present being converted at a 1-butene conversion of more than 95%.