Process and apparatus for the conversion of a hydrocarbon feedstock using two hydrotreatment reactors and one single fractionnation unit

A process for the conversion by hydrotreatment of a hydrocarbon charge is carried out in conversion reactions (10, 110, 104, 114) and a single fractionation unit (12) arranged between them, in which both effluents of the two reactors are fractionated. The effluents of both reactors (10, 14) are recovered within two separate zones (24, 26) of the fractionator. The fractions of the effluents vapourised in (12) are re-condensed and withdrawn from a common zone (34) of the unit. Two separate withdrawals (18, 28) are effected on the distillation residues from the zones (24, 26) of the fractionation unit in which the effluents from (10, 14) are treated. The effluent from the first reactor (10) is collected in a zone (24) whilst the withdrawal (18) of distillation residues from this zone are directed to the inlet of the second reactor (14). Also claimed is the installation for effecting this process.