NOVELTY - Process for treating charge comprising hydrocarbon containing at least 4C per molecule and at least one unsaturated benzene compound, comprises treating at least a second charge comprising unsaturated benzene compound, and partially or directly injecting the benzene compound into the hydrogenation reaction zone external to the distillation zone, where: the treatment is carried out in a distillation zone, a depletion zone and a rectification zone associated with a hydrogenation reaction zone, which is partially external to the distillation zone and comprises at least one catalyst bed.    USE - The process is useful for treating charge comprising hydrocarbon containing at least 4C per molecule and at least one unsaturated benzene compound for the preparation of an isomerization charge of better quality paraffins (claimed).    ADVANTAGE - The process minimizes the cost and maximizes the conversion of unsaturated products while minimizing hydrogen consumption and maximizing the yield of distillate and residue from the column using unsaturated benzene compound.    DETAILED DESCRIPTION - Process for treating charge comprising hydrocarbon containing at least 4C per molecule and at least one unsaturated benzene compound, comprises treating at least a second charge comprising unsaturated benzene compound, and partially or directly injecting the benzene compound into the hydrogenation reaction zone external to the distillation zone, where: the treatment is carried out in a distillation zone, a depletion zone and a rectification zone associated with a hydrogenation reaction zone, which is partially external to the distillation zone and comprises at least one catalyst bed, in which the hydrogenation is carried out by at least a part of the unsaturated compounds contained in the charge in presence of a hydrogenation catalyst and a gas stream comprising hydrogen; the charge of the reaction zone is sampled at a height of at least one level of sampling in the distillation zone; and the effluent of the reaction zone is at least partially reintroduced in the distillation zone at a height of at least a level of reintroduction to ensure the continuity of the distillation and exiting in the head of the distillation zone by laterally removing an effluent depleted in unsaturated compounds in the distillation zone or at the bottom of the distillation zone.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic representation of treating charge comprising hydrocarbon.    Column (2)    Furnace (6)    Condenser (10)    Separator (11)    Liquid evacuation line. (13)