Method for producing high-quality gasoline and diesel oil by catalytic diesel oil

Abstract

The invention discloses a method for producing high-quality gasoline and diesel oil by catalytic diesel oil. The method comprises the following steps: (1) mixing high aromatic hydrocarbon catalytic diesel oil with circulating hydrogen and feeding the mixture into a hydrofining reaction zone I for reaction; (2) mixing generated oil obtained in the step (1) with circulating hydrogen and feeding themixture into a hydrofining reaction zone II for reaction, wherein the reaction temperature is 30-120 DEG C higher than that of the hydrofining reaction zone I; (3) dividing the generated oil obtainedin the step (2) into a light component and a heavy component; (4) mixing the light component obtained in the step (3) with circulating hydrogen and feeding the mixture into a hydro-upgrading reactionzone, and separating the generated oil to obtain a gasoline fraction and a diesel oil fraction; (5) feeding the heavy component obtained in the step (3) with circulating hydrogen and feeding the mixture into a hydro-conversion reaction zone, enabling the generated oil to pass through a separation system to obtain gas, gasoline and diesel oil fractions; and (6) mixing the gasoline obtained in the step (4) with the gasoline obtained in the step (5) to obtain a qualified gasoline product, and mixing the diesel oil obtained in the step (4) with the diesel oil obtained in the step (5) to obtain a qualified diesel oil product. By the method, high-quality fuel oil products can be produced. Compared with other technologies, the method has the characteristics of low chemical hydrogen consumption and flexible adjustment of product structures.

Description

technical field [0001] The invention relates to the field of petroleum refining. Specifically, it relates to a method for processing catalytic diesel to produce high-quality gasoline and high-quality diesel. Background technique [0002] Catalytic cracking is currently the most important secondary processing process in the petroleum refining industry, and it is also the core process of lightening heavy oil. As the world's oil becomes increasingly heavy, the processing capacity of the FCC unit is also continuously improved. Using various heavy oils as raw materials, high-octane gasoline, the main product, is obtained through catalytic cracking reactions, and a large amount of sulfur, nitrogen, and aromatics are produced at the same time. Catalytic diesel oil with high content, low cetane number or cetane index, and extremely poor stability. Moreover, the requirements of environmental protection regulations are becoming more and more stringent, and the indicators of diesel...

AI Technical Summary

Problems solved by technology

On the basis of systematically grasping the influence of operating conditions such as reaction pressure and reaction temperature on aromatics saturation, two different hydrofining reaction zones are set up to solve the problem of single-ring aromatics selection in the conventional hydrofining process of high-aromatic diesel feedstock sex problem

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