Hydrocracking method used for producing high-quality chemical raw materials

Abstract

The invention discloses a hydrocracking method used for producing high-quality chemical raw materials. According to the hydrocracking method, raw material oil and hydrogen are 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 a lower part of the hydrocracking reaction zone is filled with a hydrocracking catalyst II; the hydrocracking catalyst I comprises 30 to 70wt% of modified Y molecular sieve; the hydrocracking catalyst II comprises 15 to 50wt% of modified Y molecular sieve; and the content of modified Y molecular sieve of the hydrocracking catalyst I is 10 to 30wt% higher than that of the hydrocracking catalyst II. Acid center of the hydrocracking catalyst I matches hydrogenation center, and the hydrocracking catalyst I possesses excellent heavy naphtha selectivity; and the catalyst II possesses excellent aromatic hydrocarbon transformative capacity, and is capable of transforming aromatic hydrocarbons in heavier components into smaller molecules so as to distribute in heavy petroleum fractions. The two catalysts are combined, so that product quality is improved obviously, aromatic hydrocarbon potential content of heavy naphtha is increased 3 to 10%, and tail oil BMCI value reduces 3 to 5 units.

Description

technical field [0001] The invention relates to a hydrocracking method, in particular to a hydrocracking method for simultaneously using different types of hydrocracking catalysts to produce high-quality chemical raw materials. 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 chemical raw materials from inferior raw materials. [0003] The one-time investment of the hydrocracking unit is relatively large, and the operating cost is also relatively high. Therefore, major research companies around the world ...

AI Technical Summary

Problems solved by technology

This method can produce high-aromatic latent heavy naphtha and high-quality tail oil at the same time, but the process is more complicated than the conventional hydrocracking process, and has limitations. More than 60wt%, cetane number <30