Production of aromatic hydrocarbons from a mixed feedstock of C5 -C12 olefins and C3 -C4 hydrocarbons

Claim 1

A process for converting olefins to aromatic hydrocarbons and hydrogen which comprises bringing a mixed feedstock comprising: (a) a hydrocarbon fraction containing olefins and consisting substantially of C 5 to C 12 hydrocarbons derived from cracked spirits from the catalytic, thermal, or steam cracking of a crude oil fraction selected from the group consisting of distillate oils, light heavy distillate oils, atmospheric residue and vacuum residue; and (b) saturated and/or unsaturated C 3 -C 4 hydrocarbons derived from by-product gases from thermal, catalytic, or steam cracking of wax distillates, residues and deasphalted oils either before or after hydrotreating in which the relative proportions of the hydrocarbon fraction containing olefins (a) and the C 3 -C 4 hydrocarbons (b) in the mixed feedstock is between 1:3 and 3:1 by volume into contact in the vapor phase and at an elevated temperature with a catalyst composition comprising an aluminosilicate having a gallium compound deposited thereon and/or an aluminosilicate in which the cations have been exchanged with gallium ions, said aluminosilicate having a silica to alumina ratio of at least 5:1.