Patent ID: 7919054

Claim:
Installation for treatment of a heavy petroleum feedstock comprising the following reaction zones: a single hydrogen compression zone containing n compression stages arranged in series, n being greater than or equal to 3, a catalytic hydroconversion zone (II) containing at least one catalytic boiling-bed reactor with a rising liquid and gas flow, supplied with hydrogen via the last compression stage, and connected via a pipe ( 11 ) to a separation zone (III) containing at least one separator ( 15 ) and at least one distillation column ( 18 ), the separator allowing separation of a hydrogen-rich gas via a pipe ( 16 ) and a liquid phase that is brought via a pipe ( 17 ) to the distillation column ( 18 ), a pipe ( 21 ) drawing off a distilled gas oil fraction from the distillation column ( 18 ) is connected to a hydrotreatment zone (IV) containing a fixed-bed hydrotreatment reactor that is supplied with hydrogen by an intermediate compression stage, and whose effluent pipe ( 25 ) is connected to a separation zone (V) allowing evacuation of hydrogen to the last compression stage.