Patent ID: 6048450
Filing Date: 2000-04-11
Classification: C10G

Abstract:
A process for treating a feed of which the major part is constituted by hydrocarbons comprising at least 5 carbon atoms per molecule and containing at least one unsaturated compound comprising at the most six carbon atoms per molecule including benzene, and a minor part containing C.sub.7.sup.+ isoparaffins comprising:a) treating said feed in a distillation zone, said distillation zone being in communication with a hydrogenation reaction zone, wherein the distillation zone is a distillation column and said hydrogenation zone is at least partly outside of the distillation column.b) removing from the distillation zone a charge for the hydrogenation reaction zone at a removal level of the distillation zone and representing at least part of the liquid flowing into the distillation zone,c) hydrogenating, in said hydrogenation reaction zone comprising at least one catalytic bed, at least part of the unsaturated compounds comprising at the most six carbon atoms per molecule including benzene contained in the charge, in the presence of a hydrogenation catalyst and a gaseous flow containing hydrogen, to produce a hydrogenation effluent containing cyclohexane,d) reintroducing at least part of the hydrogenation effluent from the hydrogenation reaction zone into the distillation zone, in such a way as to ensure continuity of the distillation,e) removing from the top of the distillation zone an overhead effluent with a depleted content of cyclohexane and C.sub.7.sup.+ isoparaffins and said at least one unsaturated compounds comprising at the most six carbon atoms per molecule, and at the bottom of the distillation zone a bottom effluent with a depleted content of said at least one unsaturated compound comprising at the most six carbon atoms per molecule, and(f) treating at least a part of the overhead effluent drawn off from the top of the distillation zone selectively in an isomerisation zone, said part of the effluent comprising paraffins containing at least 5 carbon atoms per molecule in the presence of an isomerisation catalyst, to obtain an isomerate containing an increased concentration of branched hydrocarbons.