Process for the joint production of highly pure 1-butene and premium gasoline from a C.sub.4 olefinic cut

摘要

Highly pure 1-butene and premium gasoline are obtained by P P(a) subjecting a C.sub.4 olefinic cut to a polymerization- disproportionation to partly convert the isobutene thereof to a gasoline which, in turn, by partial disproportionation, yields a jet fuel base and butenes,PP(b) fractionating the effluent from step (a) to a mixture (&agr;) of gasoline and jet fuel base and to a fraction (. beta. ) containing isobutane, n-butane, butenes, a small amount of isobutene and a minor amount of butadiene,PP(c) selectively polymerizing fraction (&bgr;) to convert more than 90% of the isobutene thereof to gasoline,PP(d) fractionating the polymerized fraction (&bgr;) to a gasoline cut (&ggr;) containing isobutene dimers and trimers and to a fraction (&dgr;) containing isobutane, n-butane and butenes,PP(e) selectively hydrogenating the fraction (&dgr;),PP(f) removing isobutane from the hydrogenated fraction (&dgr;) andPP (g) fractionating the deisobutanized hydrogenated fraction (&dgr;) to obtain a fraction containing at least 99% of 1-butene, the mixture (. alpha.) being admixed with the cut (&ggr;).