Coal tar and residual oil combined treatment process

Abstract

The invention discloses a coal tar and residual oil combined treatment process. The combined treatment process comprises the following steps: introducing inferior heavy oil into a first hydro-processing unit; carrying out a hydrogenation reaction in the presence of hydrogen and a first hydro-processing catalyst, allowing a liquid phase effluent obtained after the reaction to directly enter a catalytic cracking unit without fractionation, separating a reaction product to obtain catalytic slurry oil, mixing the catalytic slurry oil with a first auxiliary agent, carrying out settlement separationafter mixing, separating to obtain a first material and residues; introducing the first material into a second hydro-processing unit, carrying out a hydrogenation reaction under the action of a second hydro-processing catalyst and hydrogen, introducing a liquid-phase effluent obtained after the reaction into a clarification unit, obtaining clarified oil after separation, and subjecting clarifiedoil to further solid-liquid separation to obtain purified oil slurry. According to the combined process, solid impurities in the oil slurry and the coal tar full fraction can be efficiently removed, meanwhile, the liquid yield is basically not reduced, and the utilization rate of residual oil and the coal tar full fraction is greatly increased.

Description

technical field [0001] The invention belongs to the field of oil refining and chemical industry, and in particular relates to a combined treatment process of coal tar and residual oil. Background technique [0002] As crude oil becomes heavier and inferior, the proportion of residual oil, which is the heaviest component in crude oil, continues to increase. With increasingly stringent environmental protection requirements, the efficient use of heavy oil, especially residual oil, is not only related to whether it can meet The requirements of cleaner production have also become an important factor affecting the economic benefits and even the survival of enterprises. From the traditional processing methods of residual oil, residual oil processing can be divided into two routes: hydrogenation and decarburization. Decarburization mainly refers to thermal cracking, visbreaking and solvent deasphalting, etc., while hydrogenation routes can be divided into fixed Bed hydrogenation, s...

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Problems solved by technology

[0008] The traditional heavy oil thermal processing technology has the problems of low liquid yield and serious pollution, while the catalytic oil slurry obtained by the heavy oil catalytic cracking technology has the problem of high solid content and small particle size, and there is a loss of liquid yield when the catalytic oil slurry is treated by conventional filtration. High, incomplete removal of catalyst powder, easy clogging of filters, frequent backwashing, and unstable operation of filtration devices, resulting in catalytic oil slurry usually only being used as feed to coking units, and a large amount of low-value coke is produced as a by-product. Catalytic oil slurry value is not fully realized

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