Hydrocracking method used for producing high-quality jet fuel

Abstract

The invention discloses a hydrocracking method used for producing high-quality jet fuel. According to the hydrofinishing method, raw material oil is mixed with hydrogen, and an obtained mixture is delivered through a hydrofinishing reaction zone and a hydrocracking reaction zone successively; the hydrocracking reaction zone comprises at least two hydrocracking catalysts, the upper part of the hydrocracking reaction zone is filled with a hydrocracking catalyst I, and the lower part of the hydrocracking reaction zone is filled with a hydrocracking catalyst II; the hydrocracking catalyst I comprises 15 to 50wt% of modified Y molecular sieve; the hydrocracking catalyst II comprises 3 to 25wt% of modified Y molecular sieve; and the content of modified Y molecular sieve of the hydrocracking catalyst I is 10 to 25wt% higher than that of the hydrocracking catalyst II. The hydrocracking catalyst I possesses relatively high aromatic hydrocarbon transformative capacity, and is capable of transforming aromatic hydrocarbons in heavier components of the raw material into smaller molecules, and distributing the smaller molecules in heavy petroleum fractions and jet fuel fractions; and the hydrocracking catalyst II possesses relatively high hydrocarbon alkyl cracking capacity. The two catalysts are combined, so that product quality is improved obviously, and especially, smoke point of jet fuel fractions is increased, and tail oil BMCI value is reduced.

Description

technical field [0001] The invention relates to a hydrocracking method, specifically a method for simultaneously using different types of hydrocracking catalysts to improve the quality of some products, especially a hydrocracking method for producing high-quality jet fuel. Background technique [0002] As the market demand for middle distillates continues to increase, refineries are required to produce more middle distillates. The new fuel standard puts forward stricter requirements on the indicators of gasoline and diesel. Obviously, primary processing methods and FCC technology can no longer meet the market's requirements for clean fuels. The hydrocracking process is not only a secondary processing method to lighten heavy raw materials, but also an important means to obtain high-quality jet fuel and clean diesel from inferior raw materials. [0003] The one-time investment of the hydrocracking unit is relatively large, and the operating cost is also relatively high. Ther...

AI Technical Summary

Problems solved by technology

However, this method needs to increase more equipment, and the circulation of kerosene fraction is relatively large, which increases the investment of the device, and the operation is more complicated