Hydrogenation method for producing clean gasoline

Abstract

The invention discloses a hydrogenation method for producing clean gasoline. The method comprises the following steps: (1) enabling mixed oil for catalyzing light circulation oil and catalyzing heavycirculation oil to be mixed with hydrogen, entering a hydrogenation pre-processing reactor, and reacting under the action of a hydrofining catalyst; (2) enabling a hydrogenation effluent in the step (1) to enter a hydrocracking reactor, and reacting under the action of a hydrocracking catalyst, wherein an average pore size of the hydrocracking catalyst shows a decreasing tendency along a flowing direction of a material flow; and (3) separating the hydrogenation effluent in the step (2) to a gas phase and a liquid phase, circularly using the gas phase, and enabling the liquid phase to enter a fractionating tower; fractionating in the fractionating tower, to obtain naphtha, diesel oil and unconverted oil; and circulating the unconverted oil to the hydrocracking reactor. The method is capableof greatly improving a gasoline product yield with a high added-value and a hexadecane value of the diesel oil.

Description

technical field [0001] The invention relates to a hydrogenation method for producing clean gasoline, in particular to a hydrogenation method for catalytic light cycle oil and catalytic heavy cycle oil to produce high-quality clean gasoline. Background technique [0002] As crude oil becomes heavier and inferior, and the market demand for heavy oil decreases and the demand for light oil increases, the degree of deep conversion of heavy residual oil continues to increase. Among them, catalytic cracking is one of the heavy oil means of lightening heavy residue oil. However, the properties of the products obtained by catalytic cracking are generally poor, and generally require further treatment to obtain qualified products. The diesel fraction obtained from catalytic cracking generally has the characteristics of high aromatics content, low cetane number, high sulfur and nitrogen content, and it is difficult to directly use it as a product, and it is difficult to effectively imp...

AI Technical Summary

Problems solved by technology

Although it is possible to process low-quality diesel from catalytic cracking, which increases the processing methods of inferior raw materials and converts them into high-quality products, the proportion of blended catalytic diesel is still limited to a certain extent, and the amount of catalytic diesel that can be processed is very small. Diesel hydrogen consumption is high

[0009] CN103773455A The invention discloses a method for combined hydrogenation of animal and vegetable oils and catalytic diesel oil. Essentially, catalytic diesel oil is processed through hydrogenation and refining. Although catalytic diesel oil can be processed through a suitable raw material ratio, due to the limitation of diesel product indicators , the amount of catalytic diesel that can be blended is very small, which cannot completely solve the problem of processing a large amount of catalytic diesel in large catalytic refineries

Although this method can produce low-sulfur diesel oil, the investment in equipment and catalyst is high, and the operation is difficult