Hydrocracking method of productive high-quality jet fuel

Abstract

The invention discloses a hydrocracking method of a productive high-quality jet fuel. Raw material oil and hydrogen successively pass through a hydrofining zone and a first cracking reaction zone to obtain tail oil to get into a second cracking reaction zone for cracking; two cracking catalysts exist in the first cracking reaction zone, the upstream of the first cracking reaction zone is loaded with a catalyst I, and the downstream of the first cracking reaction zone is loaded with a catalyst II; the catalyst I contains 15%-50% of a modified Y molecular sieve, the catalyst II contains 3%-30% of the modified Y molecular sieve, and the content of the Y molecular sieve in the catalyst I is 10%-25% higher than the content of the Y molecular sieve in the catalyst II. The catalyst I has strong aromatic conversion ability, can convert aromatic hydrocarbons in heavy components into smaller molecules to distribute into the heavy naphtha fractions and aviation kerosene fractions, the catalyst II has strong alkane cracking ability, by synergy of the catalyst II and the catalyst I, the quality of the jet fuel is obviously improved. The hydrocracking method can maximumly produce the high quality jet fuel.

Description

technical field [0001] The invention relates to a hydrocracking method, in particular to a hydrocracking method which simultaneously uses different types of hydrocracking catalysts to produce high-quality jet fuel in a maximum amount. 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. Therefore, major research companies around ...

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

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