Patent ID: 8129572

Claim:
A process for codimerizing olefins, which comprises: a) providing a first olefin starting material which consists essentially of C n -olefins and providing a second olefin starting material which consists essentially of C m -olefins, wherein n and m are, independently of one another, two different integers from 2 to 12, wherein the second olefin starting material has a degree of branching of the olefins, determined as the ISO index, in the range from 0 to 1.8 and is obtained by dimerization of a raffinate II in the presence of a nickel-comprising oligomerization catalyst; and b) reacting the first and second olefin starting materials over a heterogeneous olefin oligomerization catalyst, the heterogeneous olefin oligomerization catalyst having a nickel content of not more than 1% by weight, based on the total weight of the catalyst.