Abstract: The invention relates to a method for the preparation of the polyolefinic bases of synthetic oils by the cationic oligomerization of olefinic feedstock and can be used in the petrochemical industry. A new method for the preparation of the polyolefinic bases of synthetic oils has been developed, which comprises the steps of conditioning olefinic feedstock, preparing and dosing in a reactor, solutions and suspension of the components of a catalytic system Al(O)—HCl-TBCh, isomerizing alpha-olefins and oligomerizing higher olefins and mixtures thereof under the action of the catalytic system Al(O)—HCl-TBCh, separating spent catalyst, dividing an oligomerizate into fractions and hydrogenating the fractions separated under the action of a catalyst Pd(0.2% w)/A1203+NaOH. The invention provides the improvement of all steps of the method elaborated.

Abstract: The present invention relates to a method of producing butene-1.According to the invention, the method of producing butene-1 resides in dimerizing ethylene in the presence of a complex organometallic catalyst of the formula (RO).sub.3 TiR' .AlR.sub.2 "OR + AlR.sub.2 "R', where R is an alkyl radical with from 2 to 4 carbon atoms, R' = R or H, R" is the same as R, or a catalyst having the formula Ti(OR).sub.4 + AlR.sub.2 "R' and modifiers such as (C.sub.5 H.sub.5).sub.2 TiCl.sub.2, oxygen, metaphenylenediamine or N-phenyl-.beta.-naphthylamine, in the medium of solvents such as n-heptane, n-decane, toluene, diethyl ether, ethyl chloride, vinylbutyl ether, tetrahydrofuran, diphenyl ether, methylphenyl ether and mixtures thereof.The invention will find application in petrochemical processing.