Process for converting heavy petroleum fractions that comprise a distillation stage, ebullated-bed hydroconversion stages of the vacuum distillate, and a vacuum residue and a catalytic cracking stage

摘要

Process for converting a hydrocarbon fraction that is obtained from atmospheric distillation of a crude, comprising a vacuum distillation stage (a) of said feedstock that makes it possible to obtain a vacuum distillate and a vacuum residue; a stage b) for treating at least a portion of the vacuum distillate in the presence of hydrogen; a stage c) for treating at least a portion of the vacuum residue in the presence of hydrogen, whereby said stages b) and c) are each carried out in at least one separate triphase reactor that contains at least one ebullated-bed hydrotreatment catalyst that operates with an upward flow of liquid and gas; a stage d) in which at least a portion of the product that is obtained in stage b) is sent to an atmospheric distillation zone from which a light fraction and a heavier liquid fraction are recovered; a stage e) in which at least a portion of the product that is obtained in stage c) is sent to an atmospheric distillation zone from which a light fraction and a heavier liquid fraction are recovered; and optionally a catalytic cracking stage f) in which at least a portion of the heavier liquid fractions that are obtained in stages d) and e) are at least partially cracked into lighter fuel-type fractions.