Two-stage hydrocracking method used for producing high-quality chemical raw materials

Abstract

The invention discloses a two-stage hydrocracking method used for producing high-quality chemical raw materials. The two-stage hydrocracking method comprises following steps: (1) raw material oil is mixed with hydrogen, and an obtained mixture is subjected to hydrofinishing reaction; (2) a refining reaction product is subjected to gas-liquid separation; (3) an obtained liquid product and hydrogen are subjected to hydrocracking reaction, and are contacted with a catalyst I and a catalyst II successively, wherein molecular sieve content of the catalyst I and molecular sieve content of the catalyst II are different; and (4) a hydrocracking effluent is subjected to separation and fractionation so as to obtain a plurality of hydrocracking products. The molecular sieve content of the hydrocracking catalyst I is higher, 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 of the raw material oil into smaller molecules so as to distribute in heavy petroleum fractions. The two hydrocracking catalysts with different molecular sieve contents are combined, so that aromatic hydrocarbon potential content of heavy naphtha is increased, and tail oil BMCI value is reduced.

Description

Technical field [0001] The present invention involves a method of hydrogenation, especially two sections of hydrogenation method that can produce high -quality chemical raw materials. Background technique [0002] With the continuous increase of the market's demand for intermediate distillation oil, more intermediate distillation division oil is required to produce refineries, and new fuel standards have put forward stricter requirements for the indicators of vapor and diesel.Obviously, a processing method and FCC process can no longer meet the market's indicators for cleaning fuel.Hydrogenation process is not only a secondary processing method for light quality raw materials, but also an important means to obtain high -quality chemical raw materials from inferior raw materials. [0003] Hydrogenation and cracking device is relatively large in one -time investment, and the operating costs are relatively high.Therefore, major research companies around the world are actively conduc...

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

Images