Patent ID: 7112711

Claim:
A process for oligomerising alkenes having from 3 to 6 carbon atoms which comprises contacting a feedstock comprising a) one or several alkenes having x carbon atoms, and b) optionally, one or several alkenes having y carbon atoms, x and y being different, with a catalyst containing a zeolite of the MFS structure type, under conditions to obtain selectively an oligomeric product, in which i) when the feedstock contains only alkenes having x carbon atoms, said oligomeric product contains at least 60 wt % of oligomers having 2x or 3x carbon atoms, or ii) when the feedstock contains alkenes having x carbon atoms and alkenes having y carbon atoms, said oligomeric product contains a mixture of oligomers containing predominant amounts of oligomers having x+y carbon atoms and of oligomers having 2x or 3x carbon atoms, the percentages by weight being expressed with respect to the total weight of alkenes in the feedstock, wherein the process is carried out at a temperature of from 125 to 175° C. when the feedstock contains only alkenes with 3 carbon atoms and of from 140 to 240° C. when the feedstock comprises at least one alkene wit 4 or more carbon atoms.