One-stage serial hydrocracking process

Abstract

The invention discloses a one-stage serial hydrocracking method, which includes the following contents: (1) The raw material of wax oil is mixed with hydrogen and first enters a hydrorefining reactor for desulfurization, denitrogenation and aromatic hydrocarbon saturation reaction; (2) Step (1) The effluent enters the hydrocracking reactor, and the hydrocracking reactor includes the first to nth catalyst beds along the material direction, wherein n≥3, and each catalyst bed is filled with hydrocracking catalysts with different contents of modified Y molecular sieves; (3) The effluent from the hydrocracking reactor undergoes gas-liquid separation and liquid phase fractionation to obtain naphtha, jet fuel and diesel products. The method uses wax oil as a raw material, increases the production of heavy naphtha with high aromatic potential, and improves the quality of jet fuel and diesel products by setting a reasonable catalyst gradation mode and adjusting the catalyst composition and structure in the gradation bed layer.

Description

technical field [0001] The invention relates to a hydrocracking method, in particular to a hydrocracking method for producing high-quality clean fuel by using vacuum wax oil as a raw material. 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. [0003] CN200610008413.X discloses a combined hydrocracking method. In this method, low-quality catalytic cracking diesel oil is ...

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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