PREPARATION OF ISOBUTENE OLIGOMER

PURPOSE:To prepare the titled compound, in high conversion of isobutene and low conversion of 1-butene, in high yield, by the catalyst reaction of a 4C hydro- carbon mixture containing isobutene using a catalyst obtained by the calcination of activated clay or acid clay at a specific temperature. CONSTITUTION:Isobutene oligomer is prepared by the catalytic reaction of a 4C hydrocarbon mixture containing isobutene (a 4C hydrocarbon mixture containing isomers of butane and butene and obtained as the by-product of olefin preparation by the thermal cracking of a petroleum fraction such as naphtha) at 50- 150 deg.C, preferably 70-100 deg.C, using a catalyst obtained by the calcination of activated clay or acid clay in air at 200-600 deg.C for 1-10hr, preferably at 400- 500 deg.C for 3-5hr. USE:Raw material for the oxo synthesis of nonyl alcohol and p-octylphenol, additive of gasoline, intermediate of the solvent for wet-type copying and the solvent for the preparation of high-pressure polyethylene, etc.