Residual oil hydrogenation treatment and catalytic cracking combined processing method

Abstract

The invention discloses a residual oil hydrogenation treatment and catalytic cracking combined processing method, which comprises: performing the hydrogenation reaction of a residual oil raw material in the presence of hydrogen and a hydrogenation treatment catalyst, and performing gas-liquid separation of efflux of hydrogenation reaction, wherein a gas phase is circularly used in a hydrogenation reaction, and a liquid phase is fractioned to form a light component and a heavy component; allowing a light component to enter a reactor from the bottom of a catalytic cracking riser reactor, allowing a heavy component to enter the reactor as secondary feed of the catalytic cracking riser reactor and performing a catalytic cracking reaction; and separating a dry gas, a liquefied gas and a gasoline fraction from efflux of a catalytic cracking reaction, wherein the fractions of diesel are not separated and enter a residual oil hydrogenation device after filtration. Compared with the prior art, the method can produce high-octane number gasoline and high-added-value liquefied gas to a maximum degree; meanwhile, the method can fully utilizes reaction heat and reduces production energy consumption.

Description

technical field [0001] The invention relates to a method for lightening residual oil, in particular to a process method for organically combining residual oil hydrotreating and catalytic cracking, and using residual oil as a raw material to mainly produce high-octane gasoline products. Background technique [0002] As crude oil becomes heavier and worse, more and more residual oil needs to be processed. The processing of heavy and residual oil should not only crack it into low-boiling products, such as naphtha, middle distillate oil and vacuum gas oil, etc., but also increase their hydrogen-to-carbon ratio, which requires decarbonization or hydrogenation method to achieve. Among them, decarbonization processes include coking, solvent deasphalting, heavy oil catalytic cracking, etc.; hydrogenation includes hydrocracking, hydrorefining, etc. The hydrogenation method can not only hydrogenate and convert residual oil, improve the yield of liquid products, but also remove heter...

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Problems solved by technology

In addition, it is also necessary to set up a more sophisticated fractionation system to fractionate naphtha and diesel fractions, which increases investment costs; due to heat exchange in the process, heat energy loss is more; at the same time, both hydrotreating units and catalytic cracking units have diesel products, which are relatively The overall yield of gasoline and gas products will be reduced

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