Hydrocracking method

Abstract

The invention discloses a hydrocracking method, which includes the following contents: (1) Diesel feedstock is mixed with hydrogen and first enters a hydrorefining reactor for desulfurization, denitrogenation and aromatics saturation reaction; (2) Step (1) effluent enters Hydrocracking reactor, along the material direction, the hydrocracking reactor includes the 1st to nth catalyst beds, wherein n≥3, preferably n is 3 or 4, wherein, the 1st to n-1th catalyst beds are filled A hydrocracking catalyst containing a modified Y molecular sieve; the nth catalyst bed is filled with a hydroisomerization catalyst containing molecular sieves such as β or ZSM with strong isomerization performance. The method uses diesel oil as a raw material, increases the production of heavy naphtha with high aromatic potential, and improves the low-temperature fluidity of jet fuel and diesel products through a reasonable combination of hydrocracking catalysts with different functions.

Description

technical field [0001] The invention relates to a hydrocracking method, in particular to a hydrocracking method for producing high-quality clean fuel and improving low-temperature fluidity of middle distillates by using diesel oil as raw material, especially straight-run diesel oil. Background technique [0002] Hydrocracking technology has the characteristics of strong adaptability to raw materials, great flexibility in production operations and product plans, and good product quality. It can directly convert various heavy and low-quality feedstocks into high-quality jet fuel, diesel, and lubricating oil base materials that are urgently needed by the market. As well as chemical naphtha and tail oil steam cracking raw materials for ethylene production, it has become one of the most important heavy oil deep processing processes in modern oil refining and petrochemical industries, and has been increasingly widely used at home and abroad. With the reduction of demand in my coun...

AI Technical Summary

Problems solved by technology

This method organically combines the high temperature and high pressure counter-current heat transfer technology with the hydrocracking catalyst grading technology, comprehensively utilizes the heat of hydrocracking reaction, and not only fully utilizes the characteristics of two different types of hydrocracking catalysts, but also maintains catalyst selectivity. Improve the quality of the target product, and reduce the project investment and operating energy consumption. This method has a limited yield of chemical raw materials, and the improvement rate of jet fuel quality is low, and the economic benefit is low.

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