Katalytisches Krackverfahren mit Maximierung der Dieselbasen

Catalytic cracking method with maximisation of diesel bases

Procédé de craquage catalytique avec maximisation des bases gazoles

Abstract

L'invention concerne un procédé de craquage catalytique pour maximiser la production de bases gazoles comprenant une étape de réaction de craquage dans un réacteur à lit fluidisé ascendant (1), une étape de séparation des hydrocarbures craqués et du catalyseur coké, une étape de fractionnement des hydrocarbures craqués et une étape de régénération du dit catalyseur coké, caractérisé en ce que on injecte la charge hydrocarbonée dans le réacteur ascendant sur un catalyseur partiellement désactivé par cokage préalable d'au moins une partie de celui-ci dans ce même réacteur ascendant, de façon à ce que la température de réaction des effluents en sortie du dit réacteur varie de 470 à 600°C. L'invention concerne également un dispositif de mise en oeuvre du procédé de craquage.
The catalytic cracking process comprises performing a cracking reaction in a bottom fluidized bed reactor (1), separating cracked hydrocarbons and catalyst coke, and fractionating the cracked hydrocarbons and a then regenerating the catalyst coke. The hydrocarbon feedstock is injected into an upstream reactor of a partially deactivated catalyst by coking so that the temperature of reaction of the effluent ranges from 470-600[deg] C. The pre-coking of the catalyst is achieved by injecting a hydrocarbon compound having a boiling temperature of 350[deg] C on a portion of regenerated catalyst. The catalytic cracking process comprises performing a cracking reaction in a bottom fluidized bed reactor (1), separating cracked hydrocarbons and catalyst coke, and fractionating the cracked hydrocarbons and a then regenerating the catalyst coke. The hydrocarbon feedstock is injected into an upstream reactor of a partially deactivated catalyst by coking so that the temperature of reaction of the effluent in outlet of the reactor ranges from 470-600[deg] C. The pre-coking of the catalyst in the reactor is achieved by injecting a hydrocarbon compound having a boiling temperature of 350[deg] C on a portion of regenerated catalyst, where the portion is defined by an area defined by an internal device. A part of the separated catalyst coke is returned directly to the reactor in downstream of the injection of hydrocarbon feedstock at a temperature below the reaction temperature. A part of the regenerated catalyst is coked in upstream of the injection of the load by the hydrocarbon compound, and a portion (1-75%) of the stripped and recovered catalyst coke is returned in upstream and/or downstream of the injection of load into the reactor. A cut-off temperature of lower than 160[deg] C is provided on the catalyst regenerated in the reactor, during injection step. The process further comprises performing additional cracking reaction in the reactor and recycling the hydrocarbonized cut having a boiling point of lower than 145[deg] C and/or a boiling point of greater than 350[deg] C. A second upstream reactor is used for cracking of hydrocarbon cuts with a ratio of carbon and oxygen of 4-20 at 470-650[deg] C. An independent claim is included for a device performing for catalytic cracking process to maximize production of diesel oils.

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