Method for hydrogenation and catalytic cracking of residual oil

Abstract

The invention discloses a method for the hydrogenation and catalytic cracking of residual oil. In the method, the hydrogenation of a residual oil raw material is performed in the presence of hydrogen and a hydrogenation catalyst; the effluent of the hydrogenation is subjected to gas-liquid separation; a gas phase is circularly used for hydrogenation; a liquid phase directly enters a catalytic cracking device without fractionation; and dry gases, liquefied gases and the catalytic cracking heavy fraction obtained after the catalytic cracking of gasoline are separated from the effluent of the catalytic cracking reaction and mixed with a hydrogenating raw material to undergo hydrogenation. Compared with the prior art, the method can produce gasoline with a maximum yield and can save equipment investment, make full use of reaction heat energy and reduce production energy consumption at the same time.

Description

technical field [0001] The invention relates to a method for lightening residual oil, in particular to a process for mainly producing gasoline products by organically combining residual oil hydrotreating and catalytic cracking and using residual oil as a raw material. Background technique [0002] As crude oil becomes heavier and worse, more and more residues need to be processed. The processing of heavy and residual oil is not only to crack it into products with low boiling points, such as naphtha, middle distillate oil and vacuum gas oil, but also to increase their hydrogen-carbon ratio, which requires decarbonization Or hydrogenation method to achieve. The decarbonization process includes coking, solvent deasphalting, heavy oil catalytic cracking, etc.; hydrogenation includes hydrocracking, hydrofining, etc. The hydrogenation method can hydrogenate and convert residual oil, improve the yield of liquid products, and remove heteroatoms therein, and the product quality is ...

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Problems solved by technology

However, in this method, a fractionation system is installed in both the hydrotreating and catalytic cracking processes, which increases the investment cost; due to the heat exchange in the process, the heat energy loss is more; at the same time, both the hydrotreating unit and the catalytic cracking unit have diesel products, relatively speaking , the total yield of gasoline and gas products will decrease

In addition, the residual oil cracking rate of the residual oil hydrotreating unit is low, and the yields of naphtha and diesel oil obtained by fractionating the hydrogenated oil are limited, and the diesel fraction obtained during the residual oil hydrotreating process still cannot meet the high quality requirements. Requirements for Diesel Products

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