A low energy consumption two-stage hydrocracking method

Abstract

The present invention discloses a low energy-consumption two-stage hydrocracking method. According to the method, a raw material and hydrogen gas are mixed, are subjected to heat exchange two times, pass through a heating furnace, and then are subjected to a hydrorefining reaction; the refining effluent is subjected to gas-liquid separation; the obtained liquid partially enters a hydrocracking reaction zone, wherein the cracking reaction zone comprises at least two cracking catalysts, the upstream is a catalyst I, the downstream is a catalyst II, the catalyst I contains 15-50 wt% of a modified Y molecular sieve, the catalyst II contains 3-30 wt% of the modified Y molecular sieve, and the modified Y molecular sieve content in the catalyst I is 10-25% higher than the modified Y molecular sieve content in the catalyst II; and the hydrocracking effluent is subjected to separation and fractionation to obtain a variety of products. According to the method of the present invention, the high temperature high pressure countercurrent heat transfer technology and the hydrocracking catalyst grading technology are organically combined, and the hydrocracking reaction heat is comprehensively utilized, such that the catalyst selectivity is maintained while the target product quality is improved, and the project investment and the operating energy consumption are reduced.

Description

technical field [0001] The invention relates to a hydrocracking method, in particular to a low-energy two-stage hydrocracking method capable of 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] In recent years, with the worldwide shortage of crude oil resources and the increasingly inferior quality of crude oil, the properties of raw materials processed by hydrocracking units have also become increasingly heavy ...

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

Images