Catalytic cracking method with maximisation of diesel bases

Abstract

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.

Description

technical field [0001] The present invention relates to a catalytic cracking process for maximizing the production of diesel base stocks, comprising a cracking reaction step in at least one upflow fluidized bed reactor, a step of separating cracked hydrocarbons and catalyst, a step of fractionating cracked hydrocarbons and coking Catalyst regeneration steps. The invention also relates to a plant for carrying out said process, which plant may comprise one or more upflow reactors. Background technique [0002] In recent years, refineries and companies offering FCC (Fluid Catalytic Cracking) technology licenses have worked to optimize the operation of these processes and corresponding equipment. The optimization is initially focused on the production of light liquefied gas products (or LPG: Liquefied Petroleum Gas), naphtha and gasoline, which basically meet the market for polymers produced by the polymerization of light olefins or for light and heavy motor vehicles Most of t...

AI Technical Summary

Problems solved by technology

[0008] - to have a medium or low specific surface area (for example below 110m 2 / g) low activity catalysts are circulated in the plant to favor the bottom conversion of the heaviest components of the feedstock and limit the conversion of the feedstock, but the yields of dry gas and liquefied gas or LPG are too low (typically less than 15%),

[0009] - Or use commercially available acidic catalysts such as those currently used to maximize gasoline production, altering the effective surface area of ​​the catalyst by coking to limit its conversion by making the catalyst less active before introducing fresh feedstock into the reactor

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