Patent ID: 8653316

Claim:
A process for the preparation of linear low molecular weight alpha-olefins having 4 to 24 carbon atoms, comprising oligomerizing of ethylene in an inert solvent in the presence of a catalyst system comprising: (i) zirconium carboxylate of the formula (R 1 COO) m ZrCl 4-m , wherein R 1 is saturated or unsaturated aliphatic C 1 -C 10 hydrocarbon or aromatic C 6 -C 14 hydrocarbon and m fulfills 1≦m≦4, (ii) at least one aluminum compound selected from organoaluminum compounds of the formula R 2 n AlX 3-n , wherein R 2 is C 1 -C 20 alkyl, X is chlorine, bromine or iodine, and n fulfills 1≦n≦2, and/or aluminoxanes, and (iii) an ester compound and a sulphur compound.